From c3dd6b01fe72b76b116b719b30781af9a2f6571b Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Sun, 22 Jan 2012 18:15:02 +0100
Subject: [PATCH] MDL-27982 drop UNSIGNED attributes from all install.xml files

---
 admin/tool/customlang/db/install.xml          |   16 +-
 blocks/community/db/install.xml               |    6 +-
 blocks/rss_client/db/install.xml              |    8 +-
 enrol/authorize/db/install.xml                |   30 +-
 enrol/flatfile/db/install.xml                 |   16 +-
 enrol/paypal/db/install.xml                   |   12 +-
 grade/grading/form/rubric/db/install.xml      |   28 +-
 lib/db/install.xml                            | 1768 ++++++++---------
 mnet/service/enrol/db/install.xml             |   28 +-
 mod/assignment/db/install.xml                 |   56 +-
 mod/chat/db/install.xml                       |   58 +-
 mod/choice/db/install.xml                     |   46 +-
 mod/data/db/install.xml                       |   68 +-
 mod/feedback/db/install.xml                   |  108 +-
 mod/folder/db/install.xml                     |   12 +-
 mod/forum/db/install.xml                      |  122 +-
 mod/glossary/db/install.xml                   |   98 +-
 mod/imscp/db/install.xml                      |   14 +-
 mod/label/db/install.xml                      |   10 +-
 mod/lesson/db/install.xml                     |  176 +-
 mod/lti/db/install.xml                        |   70 +-
 mod/page/db/install.xml                       |   20 +-
 mod/quiz/db/install.xml                       |  132 +-
 mod/quiz/report/overview/db/install.xml       |   16 +-
 mod/quiz/report/statistics/db/install.xml     |   76 +-
 mod/resource/db/install.xml                   |   38 +-
 mod/scorm/db/install.xml                      |  142 +-
 mod/survey/db/install.xml                     |   36 +-
 mod/url/db/install.xml                        |   12 +-
 mod/wiki/db/install.xml                       |   74 +-
 mod/workshop/db/install.xml                   |  290 +--
 mod/workshop/eval/best/db/install.xml         |    8 +-
 mod/workshop/form/accumulative/db/install.xml |   14 +-
 mod/workshop/form/comments/db/install.xml     |   10 +-
 mod/workshop/form/numerrors/db/install.xml    |   22 +-
 mod/workshop/form/rubric/db/install.xml       |   22 +-
 portfolio/mahara/db/install.xml               |    6 +-
 question/type/calculated/db/install.xml       |   52 +-
 question/type/essay/db/install.xml            |   12 +-
 question/type/match/db/install.xml            |   24 +-
 question/type/multianswer/db/install.xml      |    6 +-
 question/type/multichoice/db/install.xml      |   20 +-
 question/type/numerical/db/install.xml        |   26 +-
 question/type/randomsamatch/db/install.xml    |    8 +-
 question/type/shortanswer/db/install.xml      |    8 +-
 question/type/truefalse/db/install.xml        |   10 +-
 46 files changed, 1917 insertions(+), 1917 deletions(-)

diff --git a/admin/tool/customlang/db/install.xml b/admin/tool/customlang/db/install.xml
index 4cee03bfeb9f8..4887c1f8c6392 100644
--- a/admin/tool/customlang/db/install.xml
+++ b/admin/tool/customlang/db/install.xml
@@ -1,22 +1,22 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="admin/tool/customlang/db" VERSION="20110925" COMMENT="XMLDB file for Moodle admin/tool/customlang"
+<XMLDB PATH="admin/tool/customlang/db" VERSION="20120122" COMMENT="XMLDB file for Moodle admin/tool/customlang"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="tool_customlang" COMMENT="Contains the working checkout of all strings and their customization" NEXT="tool_customlang_components">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lang"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lang"/>
         <FIELD NAME="lang" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" COMMENT="The code of the language this string belongs to. Like en, cs or es" PREVIOUS="id" NEXT="componentid"/>
-        <FIELD NAME="componentid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the component" PREVIOUS="lang" NEXT="stringid"/>
+        <FIELD NAME="componentid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the component" PREVIOUS="lang" NEXT="stringid"/>
         <FIELD NAME="stringid" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The identifier of the string" PREVIOUS="componentid" NEXT="original"/>
         <FIELD NAME="original" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="English original of the string" PREVIOUS="stringid" NEXT="master"/>
         <FIELD NAME="master" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Master translation of the string as is distributed in the official lang pack, null if not translated" PREVIOUS="original" NEXT="local"/>
         <FIELD NAME="local" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Local customization of the string, null if not customized" PREVIOUS="master" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp of when the original or master was recently modified" PREVIOUS="local" NEXT="timecustomized"/>
-        <FIELD NAME="timecustomized" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp of when the value of the local translation was recently modified, null if not customized yet" PREVIOUS="timemodified" NEXT="outdated"/>
-        <FIELD NAME="outdated" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Either the English original or the master translation changed and the customization may be outdated" PREVIOUS="timecustomized" NEXT="modified"/>
-        <FIELD NAME="modified" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Has the string been modified via the translator?" PREVIOUS="outdated"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The timestamp of when the original or master was recently modified" PREVIOUS="local" NEXT="timecustomized"/>
+        <FIELD NAME="timecustomized" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The timestamp of when the value of the local translation was recently modified, null if not customized yet" PREVIOUS="timemodified" NEXT="outdated"/>
+        <FIELD NAME="outdated" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Either the English original or the master translation changed and the customization may be outdated" PREVIOUS="timecustomized" NEXT="modified"/>
+        <FIELD NAME="modified" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Has the string been modified via the translator?" PREVIOUS="outdated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fk_component"/>
@@ -28,7 +28,7 @@
     </TABLE>
     <TABLE NAME="tool_customlang_components" COMMENT="Contains the list of all installed plugins that provide their own language pack" PREVIOUS="tool_customlang">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The normalized name of the plugin" PREVIOUS="id" NEXT="version"/>
         <FIELD NAME="version" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="The checked out version of the plugin, null if the version is unknown" PREVIOUS="name"/>
       </FIELDS>
diff --git a/blocks/community/db/install.xml b/blocks/community/db/install.xml
index 9803f0a9b3f8b..7ee85bb46ff81 100644
--- a/blocks/community/db/install.xml
+++ b/blocks/community/db/install.xml
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="blocks/community/db" VERSION="20100428" COMMENT="XMLDB file for Moodle blocks/community"
+<XMLDB PATH="blocks/community/db" VERSION="20120122" COMMENT="XMLDB file for Moodle blocks/community"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="block_community" COMMENT="Community block">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="coursename"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="coursename"/>
         <FIELD NAME="coursename" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="coursedescription"/>
         <FIELD NAME="coursedescription" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="coursename" NEXT="courseurl"/>
         <FIELD NAME="courseurl" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="coursedescription" NEXT="imageurl"/>
diff --git a/blocks/rss_client/db/install.xml b/blocks/rss_client/db/install.xml
index e5f9ebf189f21..dbd1f144a51ac 100644
--- a/blocks/rss_client/db/install.xml
+++ b/blocks/rss_client/db/install.xml
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="blocks/rss_client/db" VERSION="20060912" COMMENT="XMLDB file for Moodle rss_client block"
+<XMLDB PATH="blocks/rss_client/db" VERSION="20120122" COMMENT="XMLDB file for Moodle rss_client block"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="block_rss_client" COMMENT="Remote news feed information. Contains the news feed id, the userid of the user who added the feed, the title of the feed itself and a description of the feed contents along with the url used to access the remote feed. Preferredtitle is a field for future use - intended to allow for custom titles rather than those found in the feed">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="title"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="title"/>
         <FIELD NAME="title" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="preferredtitle"/>
         <FIELD NAME="preferredtitle" TYPE="char" LENGTH="64" NOTNULL="true" SEQUENCE="false" PREVIOUS="title" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="preferredtitle" NEXT="shared"/>
-        <FIELD NAME="shared" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="url"/>
+        <FIELD NAME="shared" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="url"/>
         <FIELD NAME="url" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="shared"/>
       </FIELDS>
       <KEYS>
diff --git a/enrol/authorize/db/install.xml b/enrol/authorize/db/install.xml
index 0a65b29e1b36b..1f96ce5ac0aff 100644
--- a/enrol/authorize/db/install.xml
+++ b/enrol/authorize/db/install.xml
@@ -1,22 +1,22 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="enrol/authorize/db" VERSION="20100812" COMMENT="XMLDB file for Moodle enrol/authorize"
+<XMLDB PATH="enrol/authorize/db" VERSION="20120122" COMMENT="XMLDB file for Moodle enrol/authorize"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="enrol_authorize" COMMENT="Holds all known information about authorize.net transactions" NEXT="enrol_authorize_refunds">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="paymentmethod"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="paymentmethod"/>
         <FIELD NAME="paymentmethod" TYPE="char" LENGTH="6" NOTNULL="true" DEFAULT="cc" SEQUENCE="false" PREVIOUS="id" NEXT="refundinfo"/>
-        <FIELD NAME="refundinfo" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="paymentmethod" NEXT="ccname"/>
+        <FIELD NAME="refundinfo" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="paymentmethod" NEXT="ccname"/>
         <FIELD NAME="ccname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="refundinfo" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ccname" NEXT="instanceid"/>
-        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instanceid" NEXT="transid"/>
-        <FIELD NAME="transid" TYPE="int" LENGTH="20" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="status" NEXT="settletime"/>
-        <FIELD NAME="settletime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="amount"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ccname" NEXT="instanceid"/>
+        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instanceid" NEXT="transid"/>
+        <FIELD NAME="transid" TYPE="int" LENGTH="20" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transid" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="status" NEXT="settletime"/>
+        <FIELD NAME="settletime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="amount"/>
         <FIELD NAME="amount" TYPE="char" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="settletime" NEXT="currency"/>
         <FIELD NAME="currency" TYPE="char" LENGTH="3" NOTNULL="true" DEFAULT="USD" SEQUENCE="false" PREVIOUS="amount"/>
       </FIELDS>
@@ -32,12 +32,12 @@
     </TABLE>
     <TABLE NAME="enrol_authorize_refunds" COMMENT="Authorize.net refunds" PREVIOUS="enrol_authorize">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="orderid"/>
-        <FIELD NAME="orderid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="orderid" NEXT="amount"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="orderid"/>
+        <FIELD NAME="orderid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="orderid" NEXT="amount"/>
         <FIELD NAME="amount" TYPE="char" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="status" NEXT="transid"/>
-        <FIELD NAME="transid" TYPE="int" LENGTH="20" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="amount" NEXT="settletime"/>
-        <FIELD NAME="settletime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transid"/>
+        <FIELD NAME="transid" TYPE="int" LENGTH="20" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="amount" NEXT="settletime"/>
+        <FIELD NAME="settletime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="orderid"/>
diff --git a/enrol/flatfile/db/install.xml b/enrol/flatfile/db/install.xml
index ea0c6cfe90ee5..e6accedfc2857 100644
--- a/enrol/flatfile/db/install.xml
+++ b/enrol/flatfile/db/install.xml
@@ -1,19 +1,19 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="enrol/flatfile/db" VERSION="20100914" COMMENT="XMLDB file for Moodle enrol/flatfile"
+<XMLDB PATH="enrol/flatfile/db" VERSION="20120122" COMMENT="XMLDB file for Moodle enrol/flatfile"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="enrol_flatfile" COMMENT="enrol_flatfile table retrofitted from MySQL">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="roleid" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timestart"/>
-        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="roleid" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timestart"/>
+        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="id" TYPE="primary" FIELDS="id" COMMENT="primary key" NEXT="courseid-id"/>
diff --git a/enrol/paypal/db/install.xml b/enrol/paypal/db/install.xml
index 387234da70c07..b4ba6d115cb10 100644
--- a/enrol/paypal/db/install.xml
+++ b/enrol/paypal/db/install.xml
@@ -1,19 +1,19 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="enrol/paypal/db" VERSION="20100716" COMMENT="XMLDB file for Moodle enrol/paypal"
+<XMLDB PATH="enrol/paypal/db" VERSION="20120122" COMMENT="XMLDB file for Moodle enrol/paypal"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="enrol_paypal" COMMENT="Holds all known information about PayPal transactions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="business"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="business"/>
         <FIELD NAME="business" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="receiver_email"/>
         <FIELD NAME="receiver_email" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="business" NEXT="receiver_id"/>
         <FIELD NAME="receiver_id" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="receiver_email" NEXT="item_name"/>
         <FIELD NAME="item_name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="receiver_id" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item_name" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="instanceid"/>
-        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="memo"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item_name" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="instanceid"/>
+        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="memo"/>
         <FIELD NAME="memo" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="instanceid" NEXT="tax"/>
         <FIELD NAME="tax" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="memo" NEXT="option_name1"/>
         <FIELD NAME="option_name1" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="tax" NEXT="option_selection1_x"/>
@@ -26,7 +26,7 @@
         <FIELD NAME="txn_id" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="reason_code" NEXT="parent_txn_id"/>
         <FIELD NAME="parent_txn_id" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="txn_id" NEXT="payment_type"/>
         <FIELD NAME="payment_type" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="parent_txn_id" NEXT="timeupdated"/>
-        <FIELD NAME="timeupdated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="payment_type"/>
+        <FIELD NAME="timeupdated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="payment_type"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/grade/grading/form/rubric/db/install.xml b/grade/grading/form/rubric/db/install.xml
index 01ea46e397176..1ac544d00ae3e 100644
--- a/grade/grading/form/rubric/db/install.xml
+++ b/grade/grading/form/rubric/db/install.xml
@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="grade/grading/form/rubric/db" VERSION="20111014" COMMENT="XMLDB file for Moodle rubrics"
+<XMLDB PATH="grade/grading/form/rubric/db" VERSION="20120122" COMMENT="XMLDB file for Moodle rubrics"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="gradingform_rubric_criteria" COMMENT="Stores the rows of the rubric grid." NEXT="gradingform_rubric_levels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="definitionid"/>
-        <FIELD NAME="definitionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the form definition this criterion is part of" PREVIOUS="id" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Defines the order of the criterion in the rubric" PREVIOUS="definitionid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="definitionid"/>
+        <FIELD NAME="definitionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the form definition this criterion is part of" PREVIOUS="id" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Defines the order of the criterion in the rubric" PREVIOUS="definitionid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The criterion description" PREVIOUS="sortorder" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="false" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fk_definitionid"/>
@@ -19,11 +19,11 @@
     </TABLE>
     <TABLE NAME="gradingform_rubric_levels" COMMENT="Stores the columns of the rubric grid." PREVIOUS="gradingform_rubric_criteria" NEXT="gradingform_rubric_fillings">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="criterionid"/>
-        <FIELD NAME="criterionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The rubric criterion we are level of" PREVIOUS="id" NEXT="score"/>
-        <FIELD NAME="score" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="The score for this level" PREVIOUS="criterionid" NEXT="definition"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="criterionid"/>
+        <FIELD NAME="criterionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The rubric criterion we are level of" PREVIOUS="id" NEXT="score"/>
+        <FIELD NAME="score" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="The score for this level" PREVIOUS="criterionid" NEXT="definition"/>
         <FIELD NAME="definition" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The optional text describing the level" PREVIOUS="score" NEXT="definitionformat"/>
-        <FIELD NAME="definitionformat" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The format of the definition field" PREVIOUS="definition"/>
+        <FIELD NAME="definitionformat" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The format of the definition field" PREVIOUS="definition"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fk_criterionid"/>
@@ -32,12 +32,12 @@
     </TABLE>
     <TABLE NAME="gradingform_rubric_fillings" COMMENT="Stores the data of how the rubric is filled by a particular rater" PREVIOUS="gradingform_rubric_levels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="instanceid"/>
-        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the grading form instance" PREVIOUS="id" NEXT="criterionid"/>
-        <FIELD NAME="criterionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the criterion (row) in the rubric" PREVIOUS="instanceid" NEXT="levelid"/>
-        <FIELD NAME="levelid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If a particular level was selected during the assessment, its ID is stored here" PREVIOUS="criterionid" NEXT="remark"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="instanceid"/>
+        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the grading form instance" PREVIOUS="id" NEXT="criterionid"/>
+        <FIELD NAME="criterionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the criterion (row) in the rubric" PREVIOUS="instanceid" NEXT="levelid"/>
+        <FIELD NAME="levelid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If a particular level was selected during the assessment, its ID is stored here" PREVIOUS="criterionid" NEXT="remark"/>
         <FIELD NAME="remark" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Side note feedback regarding this particular criterion" PREVIOUS="levelid" NEXT="remarkformat"/>
-        <FIELD NAME="remarkformat" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The format of the remark field" PREVIOUS="remark"/>
+        <FIELD NAME="remarkformat" TYPE="int" LENGTH="2" NOTNULL="false" SEQUENCE="false" COMMENT="The format of the remark field" PREVIOUS="remark"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fk_instanceid"/>
diff --git a/lib/db/install.xml b/lib/db/install.xml
index 81c5a9177c059..8c25f21e7e42a 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="lib/db" VERSION="20120110" COMMENT="XMLDB file for core Moodle tables"
+<XMLDB PATH="lib/db" VERSION="20120122" COMMENT="XMLDB file for core Moodle tables"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="config" COMMENT="Moodle configuration variables" NEXT="config_plugins">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
@@ -17,7 +17,7 @@
     </TABLE>
     <TABLE NAME="config_plugins" COMMENT="Moodle modules and plugins configuration variables" PREVIOUS="config" NEXT="config_log">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="plugin"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="plugin"/>
         <FIELD NAME="plugin" TYPE="char" LENGTH="100" NOTNULL="true" DEFAULT="core" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="plugin" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name"/>
@@ -29,9 +29,9 @@
     </TABLE>
     <TABLE NAME="config_log" COMMENT="Changes done in server configuration through admin UI" PREVIOUS="config_plugins" NEXT="upgrade_log">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="plugin"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="plugin"/>
         <FIELD NAME="plugin" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="timemodified" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="plugin" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="oldvalue"/>
@@ -47,16 +47,16 @@
     </TABLE>
     <TABLE NAME="upgrade_log" COMMENT="Upgrade logging" PREVIOUS="config_log" NEXT="course">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="type"/>
-        <FIELD NAME="type" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="type: 0==info, 1==notice, 2==error" PREVIOUS="id" NEXT="plugin"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="type"/>
+        <FIELD NAME="type" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="type: 0==info, 1==notice, 2==error" PREVIOUS="id" NEXT="plugin"/>
         <FIELD NAME="plugin" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="type" NEXT="version"/>
         <FIELD NAME="version" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="plugin or main version if known" PREVIOUS="plugin" NEXT="targetversion"/>
         <FIELD NAME="targetversion" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="version of plugin or core specified in version.php at the time of upgrade loggging" PREVIOUS="version" NEXT="info"/>
         <FIELD NAME="info" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="targetversion" NEXT="details"/>
         <FIELD NAME="details" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="info" NEXT="backtrace"/>
         <FIELD NAME="backtrace" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="details" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="backtrace" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="backtrace" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -69,39 +69,39 @@
     </TABLE>
     <TABLE NAME="course" COMMENT="Central course table" PREVIOUS="upgrade_log" NEXT="course_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="category"/>
-        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="category" NEXT="fullname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="category"/>
+        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="category" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="char" LENGTH="254" NOTNULL="true" SEQUENCE="false" PREVIOUS="sortorder" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="fullname" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="shortname" NEXT="summary"/>
         <FIELD NAME="summary" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="idnumber" NEXT="summaryformat"/>
-        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="format"/>
+        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="format"/>
         <FIELD NAME="format" TYPE="char" LENGTH="10" NOTNULL="true" DEFAULT="topics" SEQUENCE="false" PREVIOUS="summaryformat" NEXT="showgrades"/>
-        <FIELD NAME="showgrades" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="format" NEXT="modinfo"/>
+        <FIELD NAME="showgrades" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="format" NEXT="modinfo"/>
         <FIELD NAME="modinfo" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="showgrades" NEXT="newsitems"/>
-        <FIELD NAME="newsitems" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="modinfo" NEXT="startdate"/>
-        <FIELD NAME="startdate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newsitems" NEXT="numsections"/>
-        <FIELD NAME="numsections" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="startdate" NEXT="marker"/>
-        <FIELD NAME="marker" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="numsections" NEXT="maxbytes"/>
-        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="marker" NEXT="legacyfiles"/>
-        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="course files are not necessary any more: 0 no legacy files, 1 legacy files disabled, 2 legacy files enabled" PREVIOUS="maxbytes" NEXT="showreports"/>
-        <FIELD NAME="showreports" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showreports" NEXT="visibleold"/>
-        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="the state of visible field when hiding parent category, this helps us to recover hidden states when unhiding the parent category later" PREVIOUS="visible" NEXT="hiddensections"/>
-        <FIELD NAME="hiddensections" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="groupmode"/>
-        <FIELD NAME="groupmode" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hiddensections" NEXT="groupmodeforce"/>
-        <FIELD NAME="groupmodeforce" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupmode" NEXT="defaultgroupingid"/>
-        <FIELD NAME="defaultgroupingid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="default grouping used in course modules, does not have key intentionally" PREVIOUS="groupmodeforce" NEXT="lang"/>
+        <FIELD NAME="newsitems" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="modinfo" NEXT="startdate"/>
+        <FIELD NAME="startdate" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newsitems" NEXT="numsections"/>
+        <FIELD NAME="numsections" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="startdate" NEXT="marker"/>
+        <FIELD NAME="marker" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="numsections" NEXT="maxbytes"/>
+        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="marker" NEXT="legacyfiles"/>
+        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="course files are not necessary any more: 0 no legacy files, 1 legacy files disabled, 2 legacy files enabled" PREVIOUS="maxbytes" NEXT="showreports"/>
+        <FIELD NAME="showreports" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showreports" NEXT="visibleold"/>
+        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="the state of visible field when hiding parent category, this helps us to recover hidden states when unhiding the parent category later" PREVIOUS="visible" NEXT="hiddensections"/>
+        <FIELD NAME="hiddensections" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="groupmode"/>
+        <FIELD NAME="groupmode" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hiddensections" NEXT="groupmodeforce"/>
+        <FIELD NAME="groupmodeforce" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupmode" NEXT="defaultgroupingid"/>
+        <FIELD NAME="defaultgroupingid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="default grouping used in course modules, does not have key intentionally" PREVIOUS="groupmodeforce" NEXT="lang"/>
         <FIELD NAME="lang" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="defaultgroupingid" NEXT="theme"/>
         <FIELD NAME="theme" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="lang" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="theme" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="requested"/>
-        <FIELD NAME="requested" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="restrictmodules"/>
-        <FIELD NAME="restrictmodules" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requested" NEXT="enablecompletion"/>
-        <FIELD NAME="enablecompletion" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = allow use of 'completion' progress-tracking on this course. 0 = disable completion tracking on this course." PREVIOUS="restrictmodules" NEXT="completionstartonenrol"/>
-        <FIELD NAME="completionstartonenrol" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = allow use of 'activty completion' progress-tracking on this course. 0 = disable activity completion tracking on this course." PREVIOUS="enablecompletion" NEXT="completionnotify"/>
-        <FIELD NAME="completionnotify" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Notify users when they complete this course" PREVIOUS="completionstartonenrol"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="theme" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="requested"/>
+        <FIELD NAME="requested" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="restrictmodules"/>
+        <FIELD NAME="restrictmodules" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requested" NEXT="enablecompletion"/>
+        <FIELD NAME="enablecompletion" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = allow use of 'completion' progress-tracking on this course. 0 = disable completion tracking on this course." PREVIOUS="restrictmodules" NEXT="completionstartonenrol"/>
+        <FIELD NAME="completionstartonenrol" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = allow use of 'activty completion' progress-tracking on this course. 0 = disable activity completion tracking on this course." PREVIOUS="enablecompletion" NEXT="completionnotify"/>
+        <FIELD NAME="completionnotify" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Notify users when they complete this course" PREVIOUS="completionstartonenrol"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -114,18 +114,18 @@
     </TABLE>
     <TABLE NAME="course_categories" COMMENT="Course categories" PREVIOUS="course" NEXT="course_completion_aggr_methd">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="idnumber" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parent" NEXT="coursecount"/>
-        <FIELD NAME="coursecount" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sortorder" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="coursecount" NEXT="visibleold"/>
-        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="the state of visible field when hiding parent category, this helps us to recover hidden states when unhiding the parent category later" PREVIOUS="visible" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="depth"/>
-        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="path"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parent" NEXT="coursecount"/>
+        <FIELD NAME="coursecount" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sortorder" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="coursecount" NEXT="visibleold"/>
+        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="the state of visible field when hiding parent category, this helps us to recover hidden states when unhiding the parent category later" PREVIOUS="visible" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="depth"/>
+        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="depth" NEXT="theme"/>
         <FIELD NAME="theme" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" COMMENT="Theme for the category" PREVIOUS="path"/>
       </FIELDS>
@@ -136,11 +136,11 @@
     </TABLE>
     <TABLE NAME="course_completion_aggr_methd" COMMENT="Course completion aggregation methods for criteria" PREVIOUS="course_categories" NEXT="course_completion_criteria">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="criteriatype"/>
-        <FIELD NAME="criteriatype" TYPE="int" LENGTH="20" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The criteria type we are aggregating, or NULL if complete course aggregation" PREVIOUS="course" NEXT="method"/>
-        <FIELD NAME="method" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = all, 2 = any, 3 = fraction, 4 = unit" PREVIOUS="criteriatype" NEXT="value"/>
-        <FIELD NAME="value" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="NULL = all/any, 0..1 for method 'fraction', &gt; 0 for method 'unit'" PREVIOUS="method"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="criteriatype"/>
+        <FIELD NAME="criteriatype" TYPE="int" LENGTH="20" NOTNULL="false" SEQUENCE="false" COMMENT="The criteria type we are aggregating, or NULL if complete course aggregation" PREVIOUS="course" NEXT="method"/>
+        <FIELD NAME="method" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 = all, 2 = any, 3 = fraction, 4 = unit" PREVIOUS="criteriatype" NEXT="value"/>
+        <FIELD NAME="value" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="NULL = all/any, 0..1 for method 'fraction', &gt; 0 for method 'unit'" PREVIOUS="method"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -152,16 +152,16 @@
     </TABLE>
     <TABLE NAME="course_completion_criteria" COMMENT="Course completion criteria" PREVIOUS="course_completion_aggr_methd" NEXT="course_completion_crit_compl">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="criteriatype"/>
-        <FIELD NAME="criteriatype" TYPE="int" LENGTH="20" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Type of criteria" PREVIOUS="course" NEXT="module"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="criteriatype"/>
+        <FIELD NAME="criteriatype" TYPE="int" LENGTH="20" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Type of criteria" PREVIOUS="course" NEXT="module"/>
         <FIELD NAME="module" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="Type of module (if using module criteria type)" PREVIOUS="criteriatype" NEXT="moduleinstance"/>
-        <FIELD NAME="moduleinstance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Module instance id (if using module criteria type)" PREVIOUS="module" NEXT="courseinstance"/>
-        <FIELD NAME="courseinstance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Course instance id (if using course criteria type)" PREVIOUS="moduleinstance" NEXT="enrolperiod"/>
-        <FIELD NAME="enrolperiod" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Number of days after enrolment the course is completed (if using enrolperiod criteria type)" PREVIOUS="courseinstance" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Timestamp of the date for course completion (if using date criteria type)" PREVIOUS="enrolperiod" NEXT="gradepass"/>
-        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum grade needed to pass the course (if passing grade criteria enabled)" PREVIOUS="timeend" NEXT="role"/>
-        <FIELD NAME="role" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="gradepass"/>
+        <FIELD NAME="moduleinstance" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Module instance id (if using module criteria type)" PREVIOUS="module" NEXT="courseinstance"/>
+        <FIELD NAME="courseinstance" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Course instance id (if using course criteria type)" PREVIOUS="moduleinstance" NEXT="enrolperiod"/>
+        <FIELD NAME="enrolperiod" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Number of days after enrolment the course is completed (if using enrolperiod criteria type)" PREVIOUS="courseinstance" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Timestamp of the date for course completion (if using date criteria type)" PREVIOUS="enrolperiod" NEXT="gradepass"/>
+        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum grade needed to pass the course (if passing grade criteria enabled)" PREVIOUS="timeend" NEXT="role"/>
+        <FIELD NAME="role" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="gradepass"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -172,14 +172,14 @@
     </TABLE>
     <TABLE NAME="course_completion_crit_compl" COMMENT="Course completion user records" PREVIOUS="course_completion_criteria" NEXT="course_completion_notify">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="criteriaid"/>
-        <FIELD NAME="criteriaid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Completion criteria this references" PREVIOUS="course" NEXT="gradefinal"/>
-        <FIELD NAME="gradefinal" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade for the course (included regardless of whether a passing grade was required)" PREVIOUS="criteriaid" NEXT="unenroled"/>
-        <FIELD NAME="unenroled" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Timestamp when the user was unenroled" PREVIOUS="gradefinal" NEXT="deleted"/>
-        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="unenroled" NEXT="timecompleted"/>
-        <FIELD NAME="timecompleted" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="deleted"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="criteriaid"/>
+        <FIELD NAME="criteriaid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Completion criteria this references" PREVIOUS="course" NEXT="gradefinal"/>
+        <FIELD NAME="gradefinal" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade for the course (included regardless of whether a passing grade was required)" PREVIOUS="criteriaid" NEXT="unenroled"/>
+        <FIELD NAME="unenroled" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Timestamp when the user was unenroled" PREVIOUS="gradefinal" NEXT="deleted"/>
+        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" PREVIOUS="unenroled" NEXT="timecompleted"/>
+        <FIELD NAME="timecompleted" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="deleted"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -193,11 +193,11 @@
     </TABLE>
     <TABLE NAME="course_completion_notify" COMMENT="Course completion notification emails" PREVIOUS="course_completion_crit_compl" NEXT="course_completions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="role"/>
-        <FIELD NAME="role" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="ID of the role to receive this notification message when a course has been completed" PREVIOUS="course" NEXT="message"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="role"/>
+        <FIELD NAME="role" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="ID of the role to receive this notification message when a course has been completed" PREVIOUS="course" NEXT="message"/>
         <FIELD NAME="message" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="HTML formatted message to be sent" PREVIOUS="role" NEXT="timesent"/>
-        <FIELD NAME="timesent" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
+        <FIELD NAME="timesent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -208,15 +208,15 @@
     </TABLE>
     <TABLE NAME="course_completions" COMMENT="Course completion records" PREVIOUS="course_completion_notify" NEXT="course_display">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="deleted"/>
-        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="course" NEXT="timenotified"/>
-        <FIELD NAME="timenotified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="deleted" NEXT="timeenrolled"/>
-        <FIELD NAME="timeenrolled" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timenotified" NEXT="timestarted"/>
-        <FIELD NAME="timestarted" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeenrolled" NEXT="timecompleted"/>
-        <FIELD NAME="timecompleted" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timestarted" NEXT="reaggregate"/>
-        <FIELD NAME="reaggregate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecompleted"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="deleted"/>
+        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" PREVIOUS="course" NEXT="timenotified"/>
+        <FIELD NAME="timenotified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="deleted" NEXT="timeenrolled"/>
+        <FIELD NAME="timeenrolled" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timenotified" NEXT="timestarted"/>
+        <FIELD NAME="timestarted" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeenrolled" NEXT="timecompleted"/>
+        <FIELD NAME="timecompleted" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="timestarted" NEXT="reaggregate"/>
+        <FIELD NAME="reaggregate" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecompleted"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -229,10 +229,10 @@
     </TABLE>
     <TABLE NAME="course_display" COMMENT="Stores info about how to display the course" PREVIOUS="course_completions" NEXT="enrol">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -243,34 +243,34 @@
     </TABLE>
     <TABLE NAME="enrol" COMMENT="Instances of enrolment plugins used in courses, fields marked as custom have a plugin defined meaning, core does not touch them. Create a new linked table if you need even more custom fields." PREVIOUS="course_display" NEXT="user_enrolments">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="enrol"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="enrol"/>
         <FIELD NAME="enrol" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0..9 are system constants, 0 means active enrolment, see ENROL_STATUS_* constants, plugins may define own status greater than 10" PREVIOUS="enrol" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="status" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="order of enrol plugins in each course" PREVIOUS="courseid" NEXT="name"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="0..9 are system constants, 0 means active enrolment, see ENROL_STATUS_* constants, plugins may define own status greater than 10" PREVIOUS="enrol" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="status" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="order of enrol plugins in each course" PREVIOUS="courseid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Optional instance name" PREVIOUS="sortorder" NEXT="enrolperiod"/>
-        <FIELD NAME="enrolperiod" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - enrolment duration" PREVIOUS="name" NEXT="enrolstartdate"/>
-        <FIELD NAME="enrolstartdate" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - start of self enrolment" PREVIOUS="enrolperiod" NEXT="enrolenddate"/>
-        <FIELD NAME="enrolenddate" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - end of enrolment" PREVIOUS="enrolstartdate" NEXT="expirynotify"/>
-        <FIELD NAME="expirynotify" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - notify users before expiration" PREVIOUS="enrolenddate" NEXT="expirythreshold"/>
-        <FIELD NAME="expirythreshold" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - when should be the participants notified" PREVIOUS="expirynotify" NEXT="notifyall"/>
-        <FIELD NAME="notifyall" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - Notify both participant and person responsible for enrolments" PREVIOUS="expirythreshold" NEXT="password"/>
+        <FIELD NAME="enrolperiod" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - enrolment duration" PREVIOUS="name" NEXT="enrolstartdate"/>
+        <FIELD NAME="enrolstartdate" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - start of self enrolment" PREVIOUS="enrolperiod" NEXT="enrolenddate"/>
+        <FIELD NAME="enrolenddate" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - end of enrolment" PREVIOUS="enrolstartdate" NEXT="expirynotify"/>
+        <FIELD NAME="expirynotify" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - notify users before expiration" PREVIOUS="enrolenddate" NEXT="expirythreshold"/>
+        <FIELD NAME="expirythreshold" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - when should be the participants notified" PREVIOUS="expirynotify" NEXT="notifyall"/>
+        <FIELD NAME="notifyall" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - Notify both participant and person responsible for enrolments" PREVIOUS="expirythreshold" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - enrolment or access password" PREVIOUS="notifyall" NEXT="cost"/>
         <FIELD NAME="cost" TYPE="char" LENGTH="20" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - enrolment cost" PREVIOUS="password" NEXT="currency"/>
         <FIELD NAME="currency" TYPE="char" LENGTH="3" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - cost currency" PREVIOUS="cost" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - the default role given to participants who self-enrol" PREVIOUS="currency" NEXT="customint1"/>
-        <FIELD NAME="customint1" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="roleid" NEXT="customint2"/>
-        <FIELD NAME="customint2" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint1" NEXT="customint3"/>
-        <FIELD NAME="customint3" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint2" NEXT="customint4"/>
-        <FIELD NAME="customint4" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint3" NEXT="customchar1"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Custom - the default role given to participants who self-enrol" PREVIOUS="currency" NEXT="customint1"/>
+        <FIELD NAME="customint1" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="roleid" NEXT="customint2"/>
+        <FIELD NAME="customint2" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint1" NEXT="customint3"/>
+        <FIELD NAME="customint3" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint2" NEXT="customint4"/>
+        <FIELD NAME="customint4" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general int" PREVIOUS="customint3" NEXT="customchar1"/>
         <FIELD NAME="customchar1" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general short name" PREVIOUS="customint4" NEXT="customchar2"/>
         <FIELD NAME="customchar2" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general short name" PREVIOUS="customchar1" NEXT="customdec1"/>
-        <FIELD NAME="customdec1" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="Custom - general decimal" PREVIOUS="customchar2" NEXT="customdec2"/>
-        <FIELD NAME="customdec2" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="Custom - general decimal" PREVIOUS="customdec1" NEXT="customtext1"/>
+        <FIELD NAME="customdec1" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="Custom - general decimal" PREVIOUS="customchar2" NEXT="customdec2"/>
+        <FIELD NAME="customdec2" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="Custom - general decimal" PREVIOUS="customdec1" NEXT="customtext1"/>
         <FIELD NAME="customtext1" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general text" PREVIOUS="customdec2" NEXT="customtext2"/>
         <FIELD NAME="customtext2" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Custom - general text" PREVIOUS="customtext1" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="customtext2" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="customtext2" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -282,15 +282,15 @@
     </TABLE>
     <TABLE NAME="user_enrolments" COMMENT="Users participating in courses (aka enrolled users) - everybody who is participating/visible in course, that means both teachers and students" PREVIOUS="enrol" NEXT="course_modules">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0..9 are system constants, 0 means active participation, see ENROL_PARTICIPATION_* constants, plugins may define own status greater than 10" PREVIOUS="id" NEXT="enrolid"/>
-        <FIELD NAME="enrolid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="status" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="enrolid" NEXT="timestart"/>
-        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="2147483647" SEQUENCE="false" PREVIOUS="timestart" NEXT="modifierid"/>
-        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modifierid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="0..9 are system constants, 0 means active participation, see ENROL_PARTICIPATION_* constants, plugins may define own status greater than 10" PREVIOUS="id" NEXT="enrolid"/>
+        <FIELD NAME="enrolid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="status" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="enrolid" NEXT="timestart"/>
+        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="2147483647" SEQUENCE="false" PREVIOUS="timestart" NEXT="modifierid"/>
+        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modifierid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="enrolid"/>
@@ -304,28 +304,28 @@
     </TABLE>
     <TABLE NAME="course_modules" COMMENT="course_modules table retrofitted from MySQL" PREVIOUS="user_enrolments" NEXT="course_modules_availability">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="module"/>
-        <FIELD NAME="module" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="section"/>
-        <FIELD NAME="section" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instance" NEXT="idnumber"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="module"/>
+        <FIELD NAME="module" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="instance"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="section"/>
+        <FIELD NAME="section" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instance" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="customizable idnumber" PREVIOUS="section" NEXT="added"/>
-        <FIELD NAME="added" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="idnumber" NEXT="score"/>
-        <FIELD NAME="score" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="added" NEXT="indent"/>
-        <FIELD NAME="indent" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="score" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="indent" NEXT="visibleold"/>
-        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="visible" NEXT="groupmode"/>
-        <FIELD NAME="groupmode" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="groupingid"/>
-        <FIELD NAME="groupingid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupmode" NEXT="groupmembersonly"/>
-        <FIELD NAME="groupmembersonly" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="only members of any group are allowed to access the activity" PREVIOUS="groupingid" NEXT="completion"/>
-        <FIELD NAME="completion" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether the completion-tracking facilities are enabled for this activity. 0 = not enabled (database default) 1 = manual tracking, user can tick this activity off (UI default for most activity types) 2 = automatic tracking, system should mark completion according to rules specified in course_moduleS_completion" PREVIOUS="groupmembersonly" NEXT="completiongradeitemnumber"/>
-        <FIELD NAME="completiongradeitemnumber" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Grade-item number used to track automatic completion, if applicable." PREVIOUS="completion" NEXT="completionview"/>
-        <FIELD NAME="completionview" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Controls whether a page view is part of the automatic completion requirements for this activity. 0 = view not required 1 = view required" PREVIOUS="completiongradeitemnumber" NEXT="completionexpected"/>
-        <FIELD NAME="completionexpected" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Date at which students are expected to complete this activity. This field is used when displaying student progress." PREVIOUS="completionview" NEXT="availablefrom"/>
-        <FIELD NAME="availablefrom" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="If set non-zero, the activity only becomes available from the time given here." PREVIOUS="completionexpected" NEXT="availableuntil"/>
-        <FIELD NAME="availableuntil" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="If set non-zero, the activity is only available until the time given here." PREVIOUS="availablefrom" NEXT="showavailability"/>
-        <FIELD NAME="showavailability" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1 and the activity is not available because the 'availablefrom' date has not been reached, or one of the conditions in course_modules_availability is not matched, then the item will be displayed greyed-out (unclickable) with an information message such as 'Available from (date)'. Otherwise, the item will not be displayed to students at all." PREVIOUS="availableuntil" NEXT="showdescription"/>
-        <FIELD NAME="showdescription" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Some module types support a 'description' which shows within the module pages. This option controls whether it also displays on the course main page. 0 = does not display (default), 1 = displays" PREVIOUS="showavailability"/>
+        <FIELD NAME="added" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="idnumber" NEXT="score"/>
+        <FIELD NAME="score" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="added" NEXT="indent"/>
+        <FIELD NAME="indent" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="score" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="indent" NEXT="visibleold"/>
+        <FIELD NAME="visibleold" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="visible" NEXT="groupmode"/>
+        <FIELD NAME="groupmode" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visibleold" NEXT="groupingid"/>
+        <FIELD NAME="groupingid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupmode" NEXT="groupmembersonly"/>
+        <FIELD NAME="groupmembersonly" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="only members of any group are allowed to access the activity" PREVIOUS="groupingid" NEXT="completion"/>
+        <FIELD NAME="completion" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether the completion-tracking facilities are enabled for this activity. 0 = not enabled (database default) 1 = manual tracking, user can tick this activity off (UI default for most activity types) 2 = automatic tracking, system should mark completion according to rules specified in course_moduleS_completion" PREVIOUS="groupmembersonly" NEXT="completiongradeitemnumber"/>
+        <FIELD NAME="completiongradeitemnumber" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Grade-item number used to track automatic completion, if applicable." PREVIOUS="completion" NEXT="completionview"/>
+        <FIELD NAME="completionview" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Controls whether a page view is part of the automatic completion requirements for this activity. 0 = view not required 1 = view required" PREVIOUS="completiongradeitemnumber" NEXT="completionexpected"/>
+        <FIELD NAME="completionexpected" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Date at which students are expected to complete this activity. This field is used when displaying student progress." PREVIOUS="completionview" NEXT="availablefrom"/>
+        <FIELD NAME="availablefrom" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If set non-zero, the activity only becomes available from the time given here." PREVIOUS="completionexpected" NEXT="availableuntil"/>
+        <FIELD NAME="availableuntil" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If set non-zero, the activity is only available until the time given here." PREVIOUS="availablefrom" NEXT="showavailability"/>
+        <FIELD NAME="showavailability" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1 and the activity is not available because the 'availablefrom' date has not been reached, or one of the conditions in course_modules_availability is not matched, then the item will be displayed greyed-out (unclickable) with an information message such as 'Available from (date)'. Otherwise, the item will not be displayed to students at all." PREVIOUS="availableuntil" NEXT="showdescription"/>
+        <FIELD NAME="showdescription" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Some module types support a 'description' which shows within the module pages. This option controls whether it also displays on the course main page. 0 = does not display (default), 1 = displays" PREVIOUS="showavailability"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="groupingid"/>
@@ -341,13 +341,13 @@
     </TABLE>
     <TABLE NAME="course_modules_availability" COMMENT="Table stores conditions that affect whether a module/activity is currently available to students or not." PREVIOUS="course_modules" NEXT="course_modules_completion">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="coursemoduleid"/>
-        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of the module whose availability is being restricted by this condition." PREVIOUS="id" NEXT="sourcecmid"/>
-        <FIELD NAME="sourcecmid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this condition is based on completion of another activity, then this is the course-module ID of that activity. Otherwise null." PREVIOUS="coursemoduleid" NEXT="requiredcompletion"/>
-        <FIELD NAME="requiredcompletion" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this condition is on a module's completion, then this should be set to the required completion state. Otherwise null. Suitable values are 1 = completed, 2 = completed-passed, 3 = completed-failed." PREVIOUS="sourcecmid" NEXT="gradeitemid"/>
-        <FIELD NAME="gradeitemid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this condition is based on a gradebook score, the item ID is given here (and the item will now not be available until a value is achieved for that grade). Otherwise null." PREVIOUS="requiredcompletion" NEXT="grademin"/>
-        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="If set, this is the minimum grade percentage that must be reached (greater than or equal) in order for this module to appear. Otherwise null." PREVIOUS="gradeitemid" NEXT="grademax"/>
-        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="If set, this is the maximum grade percentage that users must be below (less than) in order to display this item. Otherwise null." PREVIOUS="grademin"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="coursemoduleid"/>
+        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of the module whose availability is being restricted by this condition." PREVIOUS="id" NEXT="sourcecmid"/>
+        <FIELD NAME="sourcecmid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this condition is based on completion of another activity, then this is the course-module ID of that activity. Otherwise null." PREVIOUS="coursemoduleid" NEXT="requiredcompletion"/>
+        <FIELD NAME="requiredcompletion" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="If this condition is on a module's completion, then this should be set to the required completion state. Otherwise null. Suitable values are 1 = completed, 2 = completed-passed, 3 = completed-failed." PREVIOUS="sourcecmid" NEXT="gradeitemid"/>
+        <FIELD NAME="gradeitemid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this condition is based on a gradebook score, the item ID is given here (and the item will now not be available until a value is achieved for that grade). Otherwise null." PREVIOUS="requiredcompletion" NEXT="grademin"/>
+        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="If set, this is the minimum grade percentage that must be reached (greater than or equal) in order for this module to appear. Otherwise null." PREVIOUS="gradeitemid" NEXT="grademax"/>
+        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="If set, this is the maximum grade percentage that users must be below (less than) in order to display this item. Otherwise null." PREVIOUS="grademin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="coursemoduleid"/>
@@ -358,12 +358,12 @@
     </TABLE>
     <TABLE NAME="course_modules_completion" COMMENT="Stores the completion state (completed or not completed, etc) of each user on each activity." PREVIOUS="course_modules_availability" NEXT="course_sections">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="coursemoduleid"/>
-        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Activity that has been completed (or not)." PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of user who has (or hasn't) completed the activity." PREVIOUS="coursemoduleid" NEXT="completionstate"/>
-        <FIELD NAME="completionstate" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Whether or not the user has completed the activity. Available states: 0 = not completed [if there's no row in this table, that also counts as 0] 1 = completed 2 = completed, show passed 3 = completed, show failed" PREVIOUS="userid" NEXT="viewed"/>
-        <FIELD NAME="viewed" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Tracks whether or not this activity has been viewed. NULL = we are not tracking viewed for this activity 0 = not viewed 1 = viewed" PREVIOUS="completionstate" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Time at which the completion state last changed." PREVIOUS="viewed"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="coursemoduleid"/>
+        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Activity that has been completed (or not)." PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of user who has (or hasn't) completed the activity." PREVIOUS="coursemoduleid" NEXT="completionstate"/>
+        <FIELD NAME="completionstate" TYPE="int" LENGTH="1" NOTNULL="true" SEQUENCE="false" COMMENT="Whether or not the user has completed the activity. Available states: 0 = not completed [if there's no row in this table, that also counts as 0] 1 = completed 2 = completed, show passed 3 = completed, show failed" PREVIOUS="userid" NEXT="viewed"/>
+        <FIELD NAME="viewed" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Tracks whether or not this activity has been viewed. NULL = we are not tracking viewed for this activity 0 = not viewed 1 = viewed" PREVIOUS="completionstate" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Time at which the completion state last changed." PREVIOUS="viewed"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -375,14 +375,14 @@
     </TABLE>
     <TABLE NAME="course_sections" COMMENT="to define the sections for each course" PREVIOUS="course_modules_completion" NEXT="course_request">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="section"/>
-        <FIELD NAME="section" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="section"/>
+        <FIELD NAME="section" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="section" NEXT="summary"/>
         <FIELD NAME="summary" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="summaryformat"/>
-        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="sequence"/>
+        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="sequence"/>
         <FIELD NAME="sequence" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="summaryformat" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="sequence"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="sequence"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -393,13 +393,13 @@
     </TABLE>
     <TABLE NAME="course_request" COMMENT="course requests" PREVIOUS="course_sections" NEXT="course_allowed_modules">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="fullname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="char" LENGTH="254" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="fullname" NEXT="summary"/>
         <FIELD NAME="summary" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="shortname" NEXT="summaryformat"/>
-        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="reason"/>
+        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="summary" NEXT="reason"/>
         <FIELD NAME="reason" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="summaryformat" NEXT="requester"/>
-        <FIELD NAME="requester" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="reason" NEXT="password"/>
+        <FIELD NAME="requester" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="reason" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="requester"/>
       </FIELDS>
       <KEYS>
@@ -411,9 +411,9 @@
     </TABLE>
     <TABLE NAME="course_allowed_modules" COMMENT="allowed modules foreach course" PREVIOUS="course_request" NEXT="filter_active">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="module"/>
-        <FIELD NAME="module" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="module"/>
+        <FIELD NAME="module" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -425,11 +425,11 @@
     </TABLE>
     <TABLE NAME="filter_active" COMMENT="Stores information about which filters are active in which contexts. Also the filter sort order. See get_active_filters in lib/filterlib.php for how this data is used." PREVIOUS="course_allowed_modules" NEXT="filter_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="filter"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="filter"/>
         <FIELD NAME="filter" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="The filter internal name, like 'filter/tex' or 'mod/glossary'." PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="References context.id." PREVIOUS="filter" NEXT="active"/>
-        <FIELD NAME="active" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="Whether this filter is active in this context. +1 = On, -1 = Off, no row with this contextid = inherit. As a special case, when contextid points to the system context, -9999 means this filter is completely disabled." PREVIOUS="contextid" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Only relevant if contextid points to the system context. In other cases this field should contain 0. The order in which the filters should be applied." PREVIOUS="active"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="References context.id." PREVIOUS="filter" NEXT="active"/>
+        <FIELD NAME="active" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="Whether this filter is active in this context. +1 = On, -1 = Off, no row with this contextid = inherit. As a special case, when contextid points to the system context, -9999 means this filter is completely disabled." PREVIOUS="contextid" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Only relevant if contextid points to the system context. In other cases this field should contain 0. The order in which the filters should be applied." PREVIOUS="active"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="contextid"/>
@@ -441,9 +441,9 @@
     </TABLE>
     <TABLE NAME="filter_config" COMMENT="Stores per-context configuration settings for filters which have them." PREVIOUS="filter_active" NEXT="event">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="filter"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="filter"/>
         <FIELD NAME="filter" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="The filter internal name, like 'filter/tex' or 'mod/glossary'." PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="References context.id." PREVIOUS="filter" NEXT="name"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="References context.id." PREVIOUS="filter" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The config variable name." PREVIOUS="contextid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="The correspoding config variable value." PREVIOUS="name"/>
       </FIELDS>
@@ -457,23 +457,23 @@
     </TABLE>
     <TABLE NAME="event" COMMENT="For everything with a time associated to it" PREVIOUS="filter_config" NEXT="cache_filters">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="format"/>
-        <FIELD NAME="format" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="repeatid"/>
-        <FIELD NAME="repeatid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modulename"/>
+        <FIELD NAME="format" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="repeatid"/>
+        <FIELD NAME="repeatid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modulename"/>
         <FIELD NAME="modulename" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="repeatid" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modulename" NEXT="eventtype"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modulename" NEXT="eventtype"/>
         <FIELD NAME="eventtype" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="instance" NEXT="timestart"/>
-        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="eventtype" NEXT="timeduration"/>
-        <FIELD NAME="timeduration" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="timeduration" NEXT="uuid"/>
+        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="eventtype" NEXT="timeduration"/>
+        <FIELD NAME="timeduration" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="timeduration" NEXT="uuid"/>
         <FIELD NAME="uuid" TYPE="char" LENGTH="36" NOTNULL="true" SEQUENCE="false" PREVIOUS="visible" NEXT="sequence"/>
-        <FIELD NAME="sequence" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="uuid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sequence"/>
+        <FIELD NAME="sequence" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="uuid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sequence"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -488,12 +488,12 @@
     </TABLE>
     <TABLE NAME="cache_filters" COMMENT="For keeping information about cached data" PREVIOUS="event" NEXT="cache_text">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="filter"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="filter"/>
         <FIELD NAME="filter" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="version"/>
-        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="filter" NEXT="md5key"/>
+        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="filter" NEXT="md5key"/>
         <FIELD NAME="md5key" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="version" NEXT="rawtext"/>
         <FIELD NAME="rawtext" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="md5key" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rawtext"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rawtext"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -504,10 +504,10 @@
     </TABLE>
     <TABLE NAME="cache_text" COMMENT="For storing temporary copies of processed texts" PREVIOUS="cache_filters" NEXT="log">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="md5key"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="md5key"/>
         <FIELD NAME="md5key" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="formattedtext"/>
         <FIELD NAME="formattedtext" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" PREVIOUS="md5key" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="formattedtext"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="formattedtext"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -519,13 +519,13 @@
     </TABLE>
     <TABLE NAME="log" COMMENT="Every action is logged as far as possible" PREVIOUS="cache_text" NEXT="log_queries">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="time"/>
-        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="time" NEXT="ip"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="time"/>
+        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="time" NEXT="ip"/>
         <FIELD NAME="ip" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="module"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="module"/>
         <FIELD NAME="module" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="cmid"/>
-        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="action"/>
+        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="cmid" NEXT="url"/>
         <FIELD NAME="url" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="info"/>
         <FIELD NAME="info" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="url"/>
@@ -543,15 +543,15 @@
     </TABLE>
     <TABLE NAME="log_queries" COMMENT="Logged database queries." PREVIOUS="log" NEXT="log_display">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="qtype"/>
-        <FIELD NAME="qtype" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="query type constant" PREVIOUS="id" NEXT="sqltext"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="qtype"/>
+        <FIELD NAME="qtype" TYPE="int" LENGTH="5" NOTNULL="true" SEQUENCE="false" COMMENT="query type constant" PREVIOUS="id" NEXT="sqltext"/>
         <FIELD NAME="sqltext" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" COMMENT="query sql" PREVIOUS="qtype" NEXT="sqlparams"/>
         <FIELD NAME="sqlparams" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="query parameters" PREVIOUS="sqltext" NEXT="error"/>
-        <FIELD NAME="error" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="is error" PREVIOUS="sqlparams" NEXT="info"/>
+        <FIELD NAME="error" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="is error" PREVIOUS="sqlparams" NEXT="info"/>
         <FIELD NAME="info" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="detailed info such as error text" PREVIOUS="error" NEXT="backtrace"/>
         <FIELD NAME="backtrace" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="php execution trace" PREVIOUS="info" NEXT="exectime"/>
-        <FIELD NAME="exectime" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="query execution time in seconds as float" PREVIOUS="backtrace" NEXT="timelogged"/>
-        <FIELD NAME="timelogged" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="timestamp when log info stored into db" PREVIOUS="exectime"/>
+        <FIELD NAME="exectime" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="query execution time in seconds as float" PREVIOUS="backtrace" NEXT="timelogged"/>
+        <FIELD NAME="timelogged" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="timestamp when log info stored into db" PREVIOUS="exectime"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -559,7 +559,7 @@
     </TABLE>
     <TABLE NAME="log_display" COMMENT="For a particular module/action, specifies a moodle table/field" PREVIOUS="log_queries" NEXT="message">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="module"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="module"/>
         <FIELD NAME="module" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="module" NEXT="mtable"/>
         <FIELD NAME="mtable" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="field"/>
@@ -575,18 +575,18 @@
     </TABLE>
     <TABLE NAME="message" COMMENT="Stores all unread messages" PREVIOUS="log_display" NEXT="message_read">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="useridfrom"/>
-        <FIELD NAME="useridfrom" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="useridto"/>
-        <FIELD NAME="useridto" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useridfrom" NEXT="subject"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="useridfrom"/>
+        <FIELD NAME="useridfrom" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="useridto"/>
+        <FIELD NAME="useridto" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useridfrom" NEXT="subject"/>
         <FIELD NAME="subject" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="The message subject" PREVIOUS="useridto" NEXT="fullmessage"/>
         <FIELD NAME="fullmessage" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="subject" NEXT="fullmessageformat"/>
-        <FIELD NAME="fullmessageformat" TYPE="int" LENGTH="4" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the full message" PREVIOUS="fullmessage" NEXT="fullmessagehtml"/>
+        <FIELD NAME="fullmessageformat" TYPE="int" LENGTH="4" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the full message" PREVIOUS="fullmessage" NEXT="fullmessagehtml"/>
         <FIELD NAME="fullmessagehtml" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="html format of message" PREVIOUS="fullmessageformat" NEXT="smallmessage"/>
         <FIELD NAME="smallmessage" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Smal version of message (eg sms)" PREVIOUS="fullmessagehtml" NEXT="notification"/>
-        <FIELD NAME="notification" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="smallmessage" NEXT="contexturl"/>
+        <FIELD NAME="notification" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="smallmessage" NEXT="contexturl"/>
         <FIELD NAME="contexturl" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="If this message is a notification of an event contexturl should contain a link to view this event. For example if its a notification of a forum post contexturl should contain a link to the forum post." PREVIOUS="notification" NEXT="contexturlname"/>
         <FIELD NAME="contexturlname" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Display text for the contexturl" PREVIOUS="contexturl" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="contexturlname"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contexturlname"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -598,19 +598,19 @@
     </TABLE>
     <TABLE NAME="message_read" COMMENT="Stores all messages that have been read" PREVIOUS="message" NEXT="message_contacts">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="useridfrom"/>
-        <FIELD NAME="useridfrom" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="useridto"/>
-        <FIELD NAME="useridto" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useridfrom" NEXT="subject"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="useridfrom"/>
+        <FIELD NAME="useridfrom" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="useridto"/>
+        <FIELD NAME="useridto" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useridfrom" NEXT="subject"/>
         <FIELD NAME="subject" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="The message subject" PREVIOUS="useridto" NEXT="fullmessage"/>
         <FIELD NAME="fullmessage" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="subject" NEXT="fullmessageformat"/>
-        <FIELD NAME="fullmessageformat" TYPE="int" LENGTH="4" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the full message" PREVIOUS="fullmessage" NEXT="fullmessagehtml"/>
+        <FIELD NAME="fullmessageformat" TYPE="int" LENGTH="4" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the full message" PREVIOUS="fullmessage" NEXT="fullmessagehtml"/>
         <FIELD NAME="fullmessagehtml" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="html format of message" PREVIOUS="fullmessageformat" NEXT="smallmessage"/>
         <FIELD NAME="smallmessage" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Smal version of message (eg sms)" PREVIOUS="fullmessagehtml" NEXT="notification"/>
-        <FIELD NAME="notification" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="smallmessage" NEXT="contexturl"/>
+        <FIELD NAME="notification" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="smallmessage" NEXT="contexturl"/>
         <FIELD NAME="contexturl" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="If this message is a notification of an event contexturl should contain a link to view this event. For example if its a notification of a forum post contexturl should contain a link to the forum post." PREVIOUS="notification" NEXT="contexturlname"/>
         <FIELD NAME="contexturlname" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Display text for the contexturl" PREVIOUS="contexturl" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="contexturlname" NEXT="timeread"/>
-        <FIELD NAME="timeread" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contexturlname" NEXT="timeread"/>
+        <FIELD NAME="timeread" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -622,10 +622,10 @@
     </TABLE>
     <TABLE NAME="message_contacts" COMMENT="Maintains lists of relationships between users" PREVIOUS="message_read" NEXT="modules">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contactid"/>
-        <FIELD NAME="contactid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="blocked"/>
-        <FIELD NAME="blocked" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contactid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contactid"/>
+        <FIELD NAME="contactid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="blocked"/>
+        <FIELD NAME="blocked" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contactid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -636,13 +636,13 @@
     </TABLE>
     <TABLE NAME="modules" COMMENT="modules available in the site" PREVIOUS="message_contacts" NEXT="my_pages">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="version"/>
-        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="cron"/>
-        <FIELD NAME="cron" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="lastcron"/>
-        <FIELD NAME="lastcron" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cron" NEXT="search"/>
+        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="cron"/>
+        <FIELD NAME="cron" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="lastcron"/>
+        <FIELD NAME="lastcron" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cron" NEXT="search"/>
         <FIELD NAME="search" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="lastcron" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="search"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="search"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -653,11 +653,11 @@
     </TABLE>
     <TABLE NAME="my_pages" COMMENT="Extra user pages for the My Moodle system" PREVIOUS="modules" NEXT="sessions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The user who owns this page or 0 for system defaults" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The user who owns this page or 0 for system defaults" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="200" NOTNULL="true" SEQUENCE="false" COMMENT="The page name (freeform text)" PREVIOUS="userid" NEXT="private"/>
-        <FIELD NAME="private" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="Whether or not the page is private (dashboard) or public (profile)" PREVIOUS="name" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="The order of the pages for a user" PREVIOUS="private"/>
+        <FIELD NAME="private" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Whether or not the page is private (dashboard) or public (profile)" PREVIOUS="name" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The order of the pages for a user" PREVIOUS="private"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="id" TYPE="primary" FIELDS="id"/>
@@ -668,13 +668,13 @@
     </TABLE>
     <TABLE NAME="sessions" COMMENT="Database based session storage - now recommended" PREVIOUS="my_pages" NEXT="timezone">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="state"/>
-        <FIELD NAME="state" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 means normal session" PREVIOUS="id" NEXT="sid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="state"/>
+        <FIELD NAME="state" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 means normal session" PREVIOUS="id" NEXT="sid"/>
         <FIELD NAME="sid" TYPE="char" LENGTH="128" NOTNULL="true" SEQUENCE="false" COMMENT="Session id" PREVIOUS="state" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="sid" NEXT="sessdata"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="sid" NEXT="sessdata"/>
         <FIELD NAME="sessdata" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="session content" PREVIOUS="userid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="sessdata" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="firstip"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="sessdata" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="firstip"/>
         <FIELD NAME="firstip" TYPE="char" LENGTH="45" NOTNULL="false" SEQUENCE="false" PREVIOUS="timemodified" NEXT="lastip"/>
         <FIELD NAME="lastip" TYPE="char" LENGTH="45" NOTNULL="false" SEQUENCE="false" PREVIOUS="firstip"/>
       </FIELDS>
@@ -691,21 +691,21 @@
     </TABLE>
     <TABLE NAME="timezone" COMMENT="Rules for calculating local wall clock time for users" PREVIOUS="sessions" NEXT="user">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="year"/>
-        <FIELD NAME="year" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="tzrule"/>
+        <FIELD NAME="year" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="tzrule"/>
         <FIELD NAME="tzrule" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="year" NEXT="gmtoff"/>
-        <FIELD NAME="gmtoff" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="tzrule" NEXT="dstoff"/>
-        <FIELD NAME="dstoff" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="gmtoff" NEXT="dst_month"/>
-        <FIELD NAME="dst_month" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="dstoff" NEXT="dst_startday"/>
-        <FIELD NAME="dst_startday" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_month" NEXT="dst_weekday"/>
-        <FIELD NAME="dst_weekday" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_startday" NEXT="dst_skipweeks"/>
-        <FIELD NAME="dst_skipweeks" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_weekday" NEXT="dst_time"/>
+        <FIELD NAME="gmtoff" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="tzrule" NEXT="dstoff"/>
+        <FIELD NAME="dstoff" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gmtoff" NEXT="dst_month"/>
+        <FIELD NAME="dst_month" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dstoff" NEXT="dst_startday"/>
+        <FIELD NAME="dst_startday" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_month" NEXT="dst_weekday"/>
+        <FIELD NAME="dst_weekday" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_startday" NEXT="dst_skipweeks"/>
+        <FIELD NAME="dst_skipweeks" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_weekday" NEXT="dst_time"/>
         <FIELD NAME="dst_time" TYPE="char" LENGTH="6" NOTNULL="true" DEFAULT="00:00" SEQUENCE="false" PREVIOUS="dst_skipweeks" NEXT="std_month"/>
-        <FIELD NAME="std_month" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_time" NEXT="std_startday"/>
-        <FIELD NAME="std_startday" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_month" NEXT="std_weekday"/>
-        <FIELD NAME="std_weekday" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_startday" NEXT="std_skipweeks"/>
-        <FIELD NAME="std_skipweeks" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_weekday" NEXT="std_time"/>
+        <FIELD NAME="std_month" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dst_time" NEXT="std_startday"/>
+        <FIELD NAME="std_startday" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_month" NEXT="std_weekday"/>
+        <FIELD NAME="std_weekday" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_startday" NEXT="std_skipweeks"/>
+        <FIELD NAME="std_skipweeks" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="std_weekday" NEXT="std_time"/>
         <FIELD NAME="std_time" TYPE="char" LENGTH="6" NOTNULL="true" DEFAULT="00:00" SEQUENCE="false" PREVIOUS="std_skipweeks"/>
       </FIELDS>
       <KEYS>
@@ -714,20 +714,20 @@
     </TABLE>
     <TABLE NAME="user" COMMENT="One record for each person" PREVIOUS="timezone" NEXT="user_preferences">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="auth"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="auth"/>
         <FIELD NAME="auth" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="manual" SEQUENCE="false" PREVIOUS="id" NEXT="confirmed"/>
-        <FIELD NAME="confirmed" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="auth" NEXT="policyagreed"/>
-        <FIELD NAME="policyagreed" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="confirmed" NEXT="deleted"/>
-        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="policyagreed" NEXT="suspended"/>
-        <FIELD NAME="suspended" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="suspended flag prevents users to log in" PREVIOUS="deleted" NEXT="mnethostid"/>
-        <FIELD NAME="mnethostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="suspended" NEXT="username"/>
+        <FIELD NAME="confirmed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="auth" NEXT="policyagreed"/>
+        <FIELD NAME="policyagreed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="confirmed" NEXT="deleted"/>
+        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="policyagreed" NEXT="suspended"/>
+        <FIELD NAME="suspended" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="suspended flag prevents users to log in" PREVIOUS="deleted" NEXT="mnethostid"/>
+        <FIELD NAME="mnethostid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="suspended" NEXT="username"/>
         <FIELD NAME="username" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="mnethostid" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="username" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="password" NEXT="firstname"/>
         <FIELD NAME="firstname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="idnumber" NEXT="lastname"/>
         <FIELD NAME="lastname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="firstname" NEXT="email"/>
         <FIELD NAME="email" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="lastname" NEXT="emailstop"/>
-        <FIELD NAME="emailstop" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="email" NEXT="icq"/>
+        <FIELD NAME="emailstop" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="email" NEXT="icq"/>
         <FIELD NAME="icq" TYPE="char" LENGTH="15" NOTNULL="true" SEQUENCE="false" PREVIOUS="emailstop" NEXT="skype"/>
         <FIELD NAME="skype" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="icq" NEXT="yahoo"/>
         <FIELD NAME="yahoo" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="skype" NEXT="aim"/>
@@ -743,28 +743,28 @@
         <FIELD NAME="lang" TYPE="char" LENGTH="30" NOTNULL="true" DEFAULT="en" SEQUENCE="false" PREVIOUS="country" NEXT="theme"/>
         <FIELD NAME="theme" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="lang" NEXT="timezone"/>
         <FIELD NAME="timezone" TYPE="char" LENGTH="100" NOTNULL="true" DEFAULT="99" SEQUENCE="false" PREVIOUS="theme" NEXT="firstaccess"/>
-        <FIELD NAME="firstaccess" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timezone" NEXT="lastaccess"/>
-        <FIELD NAME="lastaccess" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstaccess" NEXT="lastlogin"/>
-        <FIELD NAME="lastlogin" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastaccess" NEXT="currentlogin"/>
-        <FIELD NAME="currentlogin" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastlogin" NEXT="lastip"/>
+        <FIELD NAME="firstaccess" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timezone" NEXT="lastaccess"/>
+        <FIELD NAME="lastaccess" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstaccess" NEXT="lastlogin"/>
+        <FIELD NAME="lastlogin" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastaccess" NEXT="currentlogin"/>
+        <FIELD NAME="currentlogin" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastlogin" NEXT="lastip"/>
         <FIELD NAME="lastip" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false" PREVIOUS="currentlogin" NEXT="secret"/>
         <FIELD NAME="secret" TYPE="char" LENGTH="15" NOTNULL="true" SEQUENCE="false" PREVIOUS="lastip" NEXT="picture"/>
-        <FIELD NAME="picture" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="secret" NEXT="url"/>
+        <FIELD NAME="picture" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="secret" NEXT="url"/>
         <FIELD NAME="url" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="picture" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="url" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="mailformat"/>
-        <FIELD NAME="mailformat" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="maildigest"/>
-        <FIELD NAME="maildigest" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mailformat" NEXT="maildisplay"/>
-        <FIELD NAME="maildisplay" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="maildigest" NEXT="htmleditor"/>
-        <FIELD NAME="htmleditor" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="maildisplay" NEXT="ajax"/>
-        <FIELD NAME="ajax" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="htmleditor" NEXT="autosubscribe"/>
-        <FIELD NAME="autosubscribe" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="ajax" NEXT="trackforums"/>
-        <FIELD NAME="trackforums" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="autosubscribe" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="trackforums" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="trustbitmask"/>
-        <FIELD NAME="trustbitmask" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="imagealt"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="mailformat"/>
+        <FIELD NAME="mailformat" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="maildigest"/>
+        <FIELD NAME="maildigest" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mailformat" NEXT="maildisplay"/>
+        <FIELD NAME="maildisplay" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="maildigest" NEXT="htmleditor"/>
+        <FIELD NAME="htmleditor" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="maildisplay" NEXT="ajax"/>
+        <FIELD NAME="ajax" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="htmleditor" NEXT="autosubscribe"/>
+        <FIELD NAME="autosubscribe" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="ajax" NEXT="trackforums"/>
+        <FIELD NAME="trackforums" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="autosubscribe" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="trackforums" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="trustbitmask"/>
+        <FIELD NAME="trustbitmask" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="imagealt"/>
         <FIELD NAME="imagealt" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="alt tag for user uploaded image" PREVIOUS="trustbitmask" NEXT="screenreader"/>
-        <FIELD NAME="screenreader" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="flag for determining whehter the user uses a screenreader." PREVIOUS="imagealt"/>
+        <FIELD NAME="screenreader" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="flag for determining whehter the user uses a screenreader." PREVIOUS="imagealt"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -785,8 +785,8 @@
     </TABLE>
     <TABLE NAME="user_preferences" COMMENT="Allows modules to store arbitrary user preferences" PREVIOUS="user" NEXT="user_lastaccess">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="value"/>
         <FIELD NAME="value" TYPE="char" LENGTH="1333" NOTNULL="true" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
@@ -799,10 +799,10 @@
     </TABLE>
     <TABLE NAME="user_lastaccess" COMMENT="To keep track of course page access times, used in online participants block, and participants list" PREVIOUS="user_preferences" NEXT="scale">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeaccess"/>
-        <FIELD NAME="timeaccess" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeaccess"/>
+        <FIELD NAME="timeaccess" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -815,14 +815,14 @@
     </TABLE>
     <TABLE NAME="scale" COMMENT="Defines grading scales" PREVIOUS="user_lastaccess" NEXT="scale_history">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="scale"/>
         <FIELD NAME="scale" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="scale" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="descriptionformat"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="descriptionformat"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -833,14 +833,14 @@
     </TABLE>
     <TABLE NAME="scale_history" COMMENT="History table" PREVIOUS="scale" NEXT="stats_daily">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
-        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="What caused the modification? manual/module/import/..." PREVIOUS="oldid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
-        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="loggeduser" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="name"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
+        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="loggeduser" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="scale"/>
         <FIELD NAME="scale" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="scale"/>
@@ -857,13 +857,13 @@
     </TABLE>
     <TABLE NAME="stats_daily" COMMENT="to accumulate daily stats" PREVIOUS="scale_history" NEXT="stats_weekly">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="activity" SEQUENCE="false" COMMENT="type of stat" PREVIOUS="roleid" NEXT="stat1"/>
-        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
-        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
+        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
+        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -876,13 +876,13 @@
     </TABLE>
     <TABLE NAME="stats_weekly" COMMENT="To accumulate weekly stats" PREVIOUS="stats_daily" NEXT="stats_monthly">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="activity" SEQUENCE="false" COMMENT="type of stat" PREVIOUS="roleid" NEXT="stat1"/>
-        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
-        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
+        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
+        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -895,13 +895,13 @@
     </TABLE>
     <TABLE NAME="stats_monthly" COMMENT="To accumulate monthly stats" PREVIOUS="stats_weekly" NEXT="stats_user_daily">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of role for the aggregates" PREVIOUS="timeend" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="activity" SEQUENCE="false" COMMENT="type of stat" PREVIOUS="roleid" NEXT="stat1"/>
-        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
-        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
+        <FIELD NAME="stat1" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat1. usually used for reads" PREVIOUS="stattype" NEXT="stat2"/>
+        <FIELD NAME="stat2" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="stat2. usually used for writes." PREVIOUS="stat1"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -914,13 +914,13 @@
     </TABLE>
     <TABLE NAME="stats_user_daily" COMMENT="To accumulate daily stats per course/user" PREVIOUS="stats_monthly" NEXT="stats_user_weekly">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
-        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
-        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
+        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
+        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="statswrites"/>
       </FIELDS>
       <KEYS>
@@ -935,13 +935,13 @@
     </TABLE>
     <TABLE NAME="stats_user_weekly" COMMENT="To accumulate weekly stats per course/user" PREVIOUS="stats_user_daily" NEXT="stats_user_monthly">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
-        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
-        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
+        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
+        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="statswrites"/>
       </FIELDS>
       <KEYS>
@@ -956,13 +956,13 @@
     </TABLE>
     <TABLE NAME="stats_user_monthly" COMMENT="To accumulate monthly stats per course/user" PREVIOUS="stats_user_weekly" NEXT="post">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
-        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
-        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="statsreads"/>
+        <FIELD NAME="statsreads" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeend" NEXT="statswrites"/>
+        <FIELD NAME="statswrites" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="statsreads" NEXT="stattype"/>
         <FIELD NAME="stattype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="statswrites"/>
       </FIELDS>
       <KEYS>
@@ -977,25 +977,25 @@
     </TABLE>
     <TABLE NAME="post" COMMENT="Generic post table to hold data blog entries etc in different modules" PREVIOUS="stats_user_monthly" NEXT="role">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="module"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="module"/>
         <FIELD NAME="module" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="moduleid"/>
-        <FIELD NAME="moduleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="coursemoduleid"/>
-        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="moduleid" NEXT="subject"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="moduleid"/>
+        <FIELD NAME="moduleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="coursemoduleid"/>
+        <FIELD NAME="coursemoduleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="moduleid" NEXT="subject"/>
         <FIELD NAME="subject" TYPE="char" LENGTH="128" NOTNULL="true" SEQUENCE="false" PREVIOUS="coursemoduleid" NEXT="summary"/>
         <FIELD NAME="summary" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="subject" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="summary" NEXT="uniquehash"/>
         <FIELD NAME="uniquehash" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="content" NEXT="rating"/>
-        <FIELD NAME="rating" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="uniquehash" NEXT="format"/>
-        <FIELD NAME="format" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rating" NEXT="summaryformat"/>
-        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="attachment"/>
+        <FIELD NAME="rating" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="uniquehash" NEXT="format"/>
+        <FIELD NAME="format" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rating" NEXT="summaryformat"/>
+        <FIELD NAME="summaryformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="attachment"/>
         <FIELD NAME="attachment" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="attachment" PREVIOUS="summaryformat" NEXT="publishstate"/>
         <FIELD NAME="publishstate" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="draft" SEQUENCE="false" PREVIOUS="attachment" NEXT="lastmodified"/>
-        <FIELD NAME="lastmodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publishstate" NEXT="created"/>
-        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastmodified" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="created"/>
+        <FIELD NAME="lastmodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publishstate" NEXT="created"/>
+        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastmodified" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="created"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="usermodified"/>
@@ -1010,11 +1010,11 @@
     </TABLE>
     <TABLE NAME="role" COMMENT="moodle roles" PREVIOUS="post" NEXT="context">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="shortname" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="archetype"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="archetype"/>
         <FIELD NAME="archetype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" COMMENT="Role archetype is used during install and role reset, marks admin role and helps in site settings" PREVIOUS="sortorder"/>
       </FIELDS>
       <KEYS>
@@ -1028,11 +1028,11 @@
     </TABLE>
     <TABLE NAME="context" COMMENT="one of these must be set" PREVIOUS="role" NEXT="context_temp">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextlevel"/>
-        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="instanceid"/>
-        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextlevel" NEXT="path"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextlevel"/>
+        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="instanceid"/>
+        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextlevel" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="instanceid" NEXT="depth"/>
-        <FIELD NAME="depth" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path"/>
+        <FIELD NAME="depth" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1045,9 +1045,9 @@
     </TABLE>
     <TABLE NAME="context_temp" COMMENT="Used by build_context_path() in upgrade and cron to keep context depths and paths in sync." PREVIOUS="context" NEXT="capabilities">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="This id isn't autonumeric/sequence. It's the context-&gt;id" NEXT="path"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="This id isn't autonumeric/sequence. It's the context-&gt;id" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="depth"/>
-        <FIELD NAME="depth" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="path"/>
+        <FIELD NAME="depth" TYPE="int" LENGTH="2" NOTNULL="true" SEQUENCE="false" PREVIOUS="path"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1055,12 +1055,12 @@
     </TABLE>
     <TABLE NAME="capabilities" COMMENT="this defines all capabilities" PREVIOUS="context_temp" NEXT="role_allow_assign">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="captype"/>
         <FIELD NAME="captype" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="contextlevel"/>
-        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="captype" NEXT="component"/>
+        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="captype" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextlevel" NEXT="riskbitmask"/>
-        <FIELD NAME="riskbitmask" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="component"/>
+        <FIELD NAME="riskbitmask" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="component"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="name"/>
@@ -1069,9 +1069,9 @@
     </TABLE>
     <TABLE NAME="role_allow_assign" COMMENT="this defines what role can assign what role" PREVIOUS="capabilities" NEXT="role_allow_override">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="allowassign"/>
-        <FIELD NAME="allowassign" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="allowassign"/>
+        <FIELD NAME="allowassign" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="roleid"/>
@@ -1084,9 +1084,9 @@
     </TABLE>
     <TABLE NAME="role_allow_override" COMMENT="this defines what role can override what role" PREVIOUS="role_allow_assign" NEXT="role_allow_switch">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="allowoverride"/>
-        <FIELD NAME="allowoverride" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="allowoverride"/>
+        <FIELD NAME="allowoverride" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="roleid"/>
@@ -1099,9 +1099,9 @@
     </TABLE>
     <TABLE NAME="role_allow_switch" COMMENT="This table stores which which other roles a user is allowed to switch to if they have one role." PREVIOUS="role_allow_override" NEXT="role_assignments">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The role the user has." PREVIOUS="id" NEXT="allowswitch"/>
-        <FIELD NAME="allowswitch" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of a role that the user is allowed to switch to as a result of having this role." PREVIOUS="roleid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The role the user has." PREVIOUS="id" NEXT="allowswitch"/>
+        <FIELD NAME="allowswitch" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of a role that the user is allowed to switch to as a result of having this role." PREVIOUS="roleid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="roleid"/>
@@ -1114,15 +1114,15 @@
     </TABLE>
     <TABLE NAME="role_assignments" COMMENT="assigning roles in different context" PREVIOUS="role_allow_switch" NEXT="role_capabilities">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modifierid"/>
-        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="component"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modifierid"/>
+        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="plugin responsible responsible for role assignment, empty when manually assigned" PREVIOUS="modifierid" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Id of enrolment/auth instance responsible for this role assignment" PREVIOUS="component" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="itemid"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Id of enrolment/auth instance responsible for this role assignment" PREVIOUS="component" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="itemid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="roleid"/>
@@ -1138,13 +1138,13 @@
     </TABLE>
     <TABLE NAME="role_capabilities" COMMENT="permission has to be signed, overriding a capability for a particular role in a particular context" PREVIOUS="role_assignments" NEXT="role_names">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextid" NEXT="capability"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contextid" NEXT="capability"/>
         <FIELD NAME="capability" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="roleid" NEXT="permission"/>
-        <FIELD NAME="permission" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="capability" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="permission" NEXT="modifierid"/>
-        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
+        <FIELD NAME="permission" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="capability" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="permission" NEXT="modifierid"/>
+        <FIELD NAME="modifierid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="roleid"/>
@@ -1159,9 +1159,9 @@
     </TABLE>
     <TABLE NAME="role_names" COMMENT="role names in native strings" PREVIOUS="role_capabilities" NEXT="role_sortorder">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="roleid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid"/>
       </FIELDS>
       <KEYS>
@@ -1175,11 +1175,11 @@
     </TABLE>
     <TABLE NAME="role_sortorder" COMMENT="sort order of course managers in a course" PREVIOUS="role_names" NEXT="role_context_levels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="roleid" NEXT="sortoder"/>
-        <FIELD NAME="sortoder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" PREVIOUS="contextid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="roleid" NEXT="sortoder"/>
+        <FIELD NAME="sortoder" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -1193,9 +1193,9 @@
     </TABLE>
     <TABLE NAME="role_context_levels" COMMENT="Lists which roles can be assigned at which context levels. The assignment is allowed in the corresponding row is present in this table." PREVIOUS="role_sortorder" NEXT="user_info_field">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="contextlevel"/>
-        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="roleid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="contextlevel"/>
+        <FIELD NAME="contextlevel" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="roleid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="contextlevel-roleid"/>
@@ -1205,21 +1205,21 @@
     </TABLE>
     <TABLE NAME="user_info_field" COMMENT="Customisable user profile fields" PREVIOUS="role_context_levels" NEXT="user_info_category">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="shortname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="shortname" SEQUENCE="false" COMMENT="short name for each field" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="field name" PREVIOUS="shortname" NEXT="datatype"/>
         <FIELD NAME="datatype" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Type of data held in this field" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Description of field" PREVIOUS="datatype" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="categoryid"/>
-        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from category table" PREVIOUS="descriptionformat" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="order within the category" PREVIOUS="categoryid" NEXT="required"/>
-        <FIELD NAME="required" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Field required" PREVIOUS="sortorder" NEXT="locked"/>
-        <FIELD NAME="locked" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Field locked" PREVIOUS="required" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Visibility: private, public, hidden" PREVIOUS="locked" NEXT="forceunique"/>
-        <FIELD NAME="forceunique" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="should the field contain unique data" PREVIOUS="visible" NEXT="signup"/>
-        <FIELD NAME="signup" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="display field on signup page" PREVIOUS="forceunique" NEXT="defaultdata"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="categoryid"/>
+        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from category table" PREVIOUS="descriptionformat" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="order within the category" PREVIOUS="categoryid" NEXT="required"/>
+        <FIELD NAME="required" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Field required" PREVIOUS="sortorder" NEXT="locked"/>
+        <FIELD NAME="locked" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Field locked" PREVIOUS="required" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Visibility: private, public, hidden" PREVIOUS="locked" NEXT="forceunique"/>
+        <FIELD NAME="forceunique" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="should the field contain unique data" PREVIOUS="visible" NEXT="signup"/>
+        <FIELD NAME="signup" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="display field on signup page" PREVIOUS="forceunique" NEXT="defaultdata"/>
         <FIELD NAME="defaultdata" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Default value for this field" PREVIOUS="signup" NEXT="defaultdataformat"/>
-        <FIELD NAME="defaultdataformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultdata" NEXT="param1"/>
+        <FIELD NAME="defaultdataformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultdata" NEXT="param1"/>
         <FIELD NAME="param1" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="General parameter field" PREVIOUS="defaultdataformat" NEXT="param2"/>
         <FIELD NAME="param2" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="General parameter field" PREVIOUS="param1" NEXT="param3"/>
         <FIELD NAME="param3" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="General parameter field" PREVIOUS="param2" NEXT="param4"/>
@@ -1232,9 +1232,9 @@
     </TABLE>
     <TABLE NAME="user_info_category" COMMENT="Customisable fields categories" PREVIOUS="user_info_field" NEXT="user_info_data">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Category name" PREVIOUS="id" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Display order" PREVIOUS="name"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Display order" PREVIOUS="name"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1242,11 +1242,11 @@
     </TABLE>
     <TABLE NAME="user_info_data" COMMENT="Data for the customisable user fields" PREVIOUS="user_info_category" NEXT="question_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from the user table" PREVIOUS="id" NEXT="fieldid"/>
-        <FIELD NAME="fieldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from the field table" PREVIOUS="userid" NEXT="data"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from the user table" PREVIOUS="id" NEXT="fieldid"/>
+        <FIELD NAME="fieldid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from the field table" PREVIOUS="userid" NEXT="data"/>
         <FIELD NAME="data" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="Field data" PREVIOUS="fieldid" NEXT="dataformat"/>
-        <FIELD NAME="dataformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="data"/>
+        <FIELD NAME="dataformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="data"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1257,14 +1257,14 @@
     </TABLE>
     <TABLE NAME="question_categories" COMMENT="Categories are for grouping questions" PREVIOUS="user_info_data" NEXT="question">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="context that this category is shared in" PREVIOUS="name" NEXT="info"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="context that this category is shared in" PREVIOUS="name" NEXT="info"/>
         <FIELD NAME="info" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid" NEXT="infoformat"/>
-        <FIELD NAME="infoformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="info" NEXT="stamp"/>
+        <FIELD NAME="infoformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="info" NEXT="stamp"/>
         <FIELD NAME="stamp" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="infoformat" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="stamp" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="999" SEQUENCE="false" PREVIOUS="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="stamp" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="999" SEQUENCE="false" PREVIOUS="parent"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="parent"/>
@@ -1276,25 +1276,25 @@
     </TABLE>
     <TABLE NAME="question" COMMENT="The questions themselves" PREVIOUS="question_categories" NEXT="question_answers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="category"/>
-        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="category" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="category"/>
+        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="category" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="parent" NEXT="questiontext"/>
         <FIELD NAME="questiontext" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="questiontextformat"/>
-        <FIELD NAME="questiontextformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="questiontext" NEXT="generalfeedback"/>
+        <FIELD NAME="questiontextformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="questiontext" NEXT="generalfeedback"/>
         <FIELD NAME="generalfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="to store the question feedback" PREVIOUS="questiontextformat" NEXT="generalfeedbackformat"/>
-        <FIELD NAME="generalfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="generalfeedback" NEXT="defaultmark"/>
-        <FIELD NAME="defaultmark" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" DECIMALS="7" PREVIOUS="generalfeedbackformat" NEXT="penalty"/>
-        <FIELD NAME="penalty" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0.3333333" SEQUENCE="false" DECIMALS="7" PREVIOUS="defaultmark" NEXT="qtype"/>
+        <FIELD NAME="generalfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="generalfeedback" NEXT="defaultmark"/>
+        <FIELD NAME="defaultmark" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="1" SEQUENCE="false" DECIMALS="7" PREVIOUS="generalfeedbackformat" NEXT="penalty"/>
+        <FIELD NAME="penalty" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0.3333333" SEQUENCE="false" DECIMALS="7" PREVIOUS="defaultmark" NEXT="qtype"/>
         <FIELD NAME="qtype" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="penalty" NEXT="length"/>
-        <FIELD NAME="length" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="qtype" NEXT="stamp"/>
+        <FIELD NAME="length" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="qtype" NEXT="stamp"/>
         <FIELD NAME="stamp" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="length" NEXT="version"/>
         <FIELD NAME="version" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="stamp" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="time question was created" PREVIOUS="hidden" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="time that question was last modified" PREVIOUS="timecreated" NEXT="createdby"/>
-        <FIELD NAME="createdby" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="userid of person who created this question" PREVIOUS="timemodified" NEXT="modifiedby"/>
-        <FIELD NAME="modifiedby" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="userid of person who last edited this question" PREVIOUS="createdby"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="time question was created" PREVIOUS="hidden" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="time that question was last modified" PREVIOUS="timecreated" NEXT="createdby"/>
+        <FIELD NAME="createdby" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="userid of person who created this question" PREVIOUS="timemodified" NEXT="modifiedby"/>
+        <FIELD NAME="modifiedby" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="userid of person who last edited this question" PREVIOUS="createdby"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="category"/>
@@ -1306,13 +1306,13 @@
     </TABLE>
     <TABLE NAME="question_answers" COMMENT="Answers, with a fractional grade (0-1) and feedback" PREVIOUS="question" NEXT="question_hints">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="answer"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="answer"/>
         <FIELD NAME="answer" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="question" NEXT="answerformat"/>
-        <FIELD NAME="answerformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="fraction"/>
-        <FIELD NAME="fraction" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="answerformat" NEXT="feedback"/>
+        <FIELD NAME="answerformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="fraction"/>
+        <FIELD NAME="fraction" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="answerformat" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="fraction" NEXT="feedbackformat"/>
-        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback"/>
+        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
@@ -1321,12 +1321,12 @@
     </TABLE>
     <TABLE NAME="question_hints" COMMENT="Stores the the part of the question definition that gives different feedback after each try in interactive and similar behaviours." PREVIOUS="question_answers" NEXT="question_usages">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="hint"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="questionid"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="hint"/>
         <FIELD NAME="hint" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="The text of the feedback to be given." PREVIOUS="questionid" NEXT="hintformat"/>
-        <FIELD NAME="hintformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the hint." PREVIOUS="hint" NEXT="shownumcorrect"/>
-        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Whether the feedback should include a message about how many things the student got right. This is only applicable to certain question types (for example matching or multiple choice multiple-response)." PREVIOUS="hintformat" NEXT="clearwrong"/>
-        <FIELD NAME="clearwrong" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Whether any wrong choices should be cleared before the next try. Whether this is applicable, and what it means, depends on the question type, as with the shownumright option." PREVIOUS="shownumcorrect" NEXT="options"/>
+        <FIELD NAME="hintformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the hint." PREVIOUS="hint" NEXT="shownumcorrect"/>
+        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Whether the feedback should include a message about how many things the student got right. This is only applicable to certain question types (for example matching or multiple choice multiple-response)." PREVIOUS="hintformat" NEXT="clearwrong"/>
+        <FIELD NAME="clearwrong" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Whether any wrong choices should be cleared before the next try. Whether this is applicable, and what it means, depends on the question type, as with the shownumright option." PREVIOUS="shownumcorrect" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="A space for any other question-type specific options." PREVIOUS="clearwrong"/>
       </FIELDS>
       <KEYS>
@@ -1336,8 +1336,8 @@
     </TABLE>
     <TABLE NAME="question_usages" COMMENT="This table's main purpose it to assign a unique id to each attempt at a set of questions by some part of Moodle. A question usage is made up of a number of question_attempts." PREVIOUS="question_hints" NEXT="question_attempts">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Every question usage must be associated with some context." PREVIOUS="id" NEXT="component"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Every question usage must be associated with some context." PREVIOUS="id" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The plugin this attempt belongs to, e.g. 'mod_quiz', 'block_questionoftheday', 'filter_embedquestion'." PREVIOUS="contextid" NEXT="preferredbehaviour"/>
         <FIELD NAME="preferredbehaviour" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="The archetypal behaviour that should be used for question attempts in this usage." PREVIOUS="component"/>
       </FIELDS>
@@ -1348,19 +1348,19 @@
     </TABLE>
     <TABLE NAME="question_attempts" COMMENT="Each row here corresponds to an attempt at one question, as part of a question_usage. A question_attempt will have some question_attempt_steps" PREVIOUS="question_usages" NEXT="question_attempt_steps">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="questionusageid"/>
-        <FIELD NAME="questionusageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key, references question_usages.id" PREVIOUS="id" NEXT="slot"/>
-        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Used to number the questions in one attempt sequentially." PREVIOUS="questionusageid" NEXT="behaviour"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="questionusageid"/>
+        <FIELD NAME="questionusageid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key, references question_usages.id" PREVIOUS="id" NEXT="slot"/>
+        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Used to number the questions in one attempt sequentially." PREVIOUS="questionusageid" NEXT="behaviour"/>
         <FIELD NAME="behaviour" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="The name of the question behaviour that is managing this question attempt." PREVIOUS="slot" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the question being attempted. Foreign key references question.id." PREVIOUS="behaviour" NEXT="variant"/>
-        <FIELD NAME="variant" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="The variant of the qusetion being used." PREVIOUS="questionid" NEXT="maxmark"/>
-        <FIELD NAME="maxmark" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="The grade this question is marked out of in this attempt." PREVIOUS="variant" NEXT="minfraction"/>
-        <FIELD NAME="minfraction" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="Some questions can award negative marks. This indicates the most negative mark that can be awarded, on the faction scale where the maximum positive mark is 1." PREVIOUS="maxmark" NEXT="flagged"/>
-        <FIELD NAME="flagged" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether this question has been flagged within the attempt." PREVIOUS="minfraction" NEXT="questionsummary"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the question being attempted. Foreign key references question.id." PREVIOUS="behaviour" NEXT="variant"/>
+        <FIELD NAME="variant" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="The variant of the qusetion being used." PREVIOUS="questionid" NEXT="maxmark"/>
+        <FIELD NAME="maxmark" TYPE="number" LENGTH="12" NOTNULL="true" SEQUENCE="false" DECIMALS="7" COMMENT="The grade this question is marked out of in this attempt." PREVIOUS="variant" NEXT="minfraction"/>
+        <FIELD NAME="minfraction" TYPE="number" LENGTH="12" NOTNULL="true" SEQUENCE="false" DECIMALS="7" COMMENT="Some questions can award negative marks. This indicates the most negative mark that can be awarded, on the faction scale where the maximum positive mark is 1." PREVIOUS="maxmark" NEXT="flagged"/>
+        <FIELD NAME="flagged" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether this question has been flagged within the attempt." PREVIOUS="minfraction" NEXT="questionsummary"/>
         <FIELD NAME="questionsummary" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="If this question uses randomisation, it should set this field to summarise what random version the student actually saw. This is a human-readable textual summary of the student's response which might, for example, be used in a report." PREVIOUS="flagged" NEXT="rightanswer"/>
         <FIELD NAME="rightanswer" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="This is a human-readable textual summary of the right answer to this question. Might be used, for example on the quiz preview, to help people who are testing the question. Or might be used in reports." PREVIOUS="questionsummary" NEXT="responsesummary"/>
         <FIELD NAME="responsesummary" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="This is a textual summary of the student's response (basically what you would expect to in the Quiz responses report)." PREVIOUS="rightanswer" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The time this record was last changed." PREVIOUS="responsesummary"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The time this record was last changed." PREVIOUS="responsesummary"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="questionid"/>
@@ -1373,13 +1373,13 @@
     </TABLE>
     <TABLE NAME="question_attempt_steps" COMMENT="Stores one step in in a question attempt. As well as the data here, the step will have some data in the question_attempt_step_data table." PREVIOUS="question_attempts" NEXT="question_attempt_step_data">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="questionattemptid"/>
-        <FIELD NAME="questionattemptid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempt.id" PREVIOUS="id" NEXT="sequencenumber"/>
-        <FIELD NAME="sequencenumber" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Numbers the steps in a question attempt sequentially." PREVIOUS="questionattemptid" NEXT="state"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="questionattemptid"/>
+        <FIELD NAME="questionattemptid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempt.id" PREVIOUS="id" NEXT="sequencenumber"/>
+        <FIELD NAME="sequencenumber" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Numbers the steps in a question attempt sequentially." PREVIOUS="questionattemptid" NEXT="state"/>
         <FIELD NAME="state" TYPE="char" LENGTH="13" NOTNULL="true" SEQUENCE="false" COMMENT="One of the constants defined by the question_state class, giving the state of the question at the end of this step." PREVIOUS="sequencenumber" NEXT="fraction"/>
-        <FIELD NAME="fraction" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="The grade for this question, when graded out of 1. Needs to be multiplied by question_attempt.maxmark to get the actual mark for the question." PREVIOUS="state" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Time-stamp of the action that lead to this state being created." PREVIOUS="fraction" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The user whose action lead to this state being created." PREVIOUS="timecreated"/>
+        <FIELD NAME="fraction" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="The grade for this question, when graded out of 1. Needs to be multiplied by question_attempt.maxmark to get the actual mark for the question." PREVIOUS="state" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Time-stamp of the action that lead to this state being created." PREVIOUS="fraction" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The user whose action lead to this state being created." PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="questionattemptid"/>
@@ -1392,8 +1392,8 @@
     </TABLE>
     <TABLE NAME="question_attempt_step_data" COMMENT="Each question_attempt_step has an associative array of the data that was submitted by the user in the POST request. It can also contain extra data from the question type or behaviour to avoid re-computation. The convention is that names belonging to the behaviour start with -, and cached values added to the submitted data start with _, or _-" PREVIOUS="question_attempt_steps" NEXT="question_states">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="attemptstepid"/>
-        <FIELD NAME="attemptstepid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempt_steps.id" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="attemptstepid"/>
+        <FIELD NAME="attemptstepid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempt_steps.id" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="The name of this bit of data." PREVIOUS="attemptstepid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="The corresponding value" PREVIOUS="name"/>
       </FIELDS>
@@ -1407,16 +1407,16 @@
     </TABLE>
     <TABLE NAME="question_states" COMMENT="Stores user responses to an attempt, and percentage grades" PREVIOUS="question_attempt_step_data" NEXT="question_sessions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="attempt"/>
-        <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attempt" NEXT="seq_number"/>
-        <FIELD NAME="seq_number" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="answer"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="attempt"/>
+        <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attempt" NEXT="seq_number"/>
+        <FIELD NAME="seq_number" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="answer"/>
         <FIELD NAME="answer" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="seq_number" NEXT="timestamp"/>
-        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="event"/>
-        <FIELD NAME="event" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestamp" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="event" NEXT="raw_grade"/>
-        <FIELD NAME="raw_grade" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="grade" NEXT="penalty"/>
-        <FIELD NAME="penalty" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="raw_grade"/>
+        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="event"/>
+        <FIELD NAME="event" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestamp" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="event" NEXT="raw_grade"/>
+        <FIELD NAME="raw_grade" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="grade" NEXT="penalty"/>
+        <FIELD NAME="penalty" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="raw_grade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="attempt"/>
@@ -1426,15 +1426,15 @@
     </TABLE>
     <TABLE NAME="question_sessions" COMMENT="Gives ids of the newest open and newest graded states" PREVIOUS="question_states" NEXT="mnet_application">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="attemptid"/>
-        <FIELD NAME="attemptid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attemptid" NEXT="newest"/>
-        <FIELD NAME="newest" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="questionid" NEXT="newgraded"/>
-        <FIELD NAME="newgraded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newest" NEXT="sumpenalty"/>
-        <FIELD NAME="sumpenalty" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="newgraded" NEXT="manualcomment"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="attemptid"/>
+        <FIELD NAME="attemptid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attemptid" NEXT="newest"/>
+        <FIELD NAME="newest" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="questionid" NEXT="newgraded"/>
+        <FIELD NAME="newgraded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newest" NEXT="sumpenalty"/>
+        <FIELD NAME="sumpenalty" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" PREVIOUS="newgraded" NEXT="manualcomment"/>
         <FIELD NAME="manualcomment" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="sumpenalty" NEXT="manualcommentformat"/>
-        <FIELD NAME="manualcommentformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="manualcomment" NEXT="flagged"/>
-        <FIELD NAME="flagged" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="The person attempting the question may mark certain questions within their question_attempt if the module that owns the attempt allow it. This field stores the status of that flag." PREVIOUS="manualcommentformat"/>
+        <FIELD NAME="manualcommentformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="manualcomment" NEXT="flagged"/>
+        <FIELD NAME="flagged" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The person attempting the question may mark certain questions within their question_attempt if the module that owns the attempt allow it. This field stores the status of that flag." PREVIOUS="manualcommentformat"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="attemptid"/>
@@ -1449,7 +1449,7 @@
     </TABLE>
     <TABLE NAME="mnet_application" COMMENT="Information about applications on remote hosts" PREVIOUS="question_sessions" NEXT="mnet_host">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="display_name"/>
         <FIELD NAME="display_name" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="xmlrpc_server_url"/>
         <FIELD NAME="xmlrpc_server_url" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="display_name" NEXT="sso_land_url"/>
@@ -1462,20 +1462,20 @@
     </TABLE>
     <TABLE NAME="mnet_host" COMMENT="Information about the local and remote hosts for RPC" PREVIOUS="mnet_application" NEXT="mnet_host2service">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Unique Host ID" NEXT="deleted"/>
-        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="wwwroot"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Unique Host ID" NEXT="deleted"/>
+        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="wwwroot"/>
         <FIELD NAME="wwwroot" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="deleted" NEXT="ip_address"/>
         <FIELD NAME="ip_address" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false" PREVIOUS="wwwroot" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="80" NOTNULL="true" SEQUENCE="false" PREVIOUS="ip_address" NEXT="public_key"/>
         <FIELD NAME="public_key" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="public_key_expires"/>
-        <FIELD NAME="public_key_expires" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="public_key" NEXT="transport"/>
-        <FIELD NAME="transport" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="public_key_expires" NEXT="portno"/>
-        <FIELD NAME="portno" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transport" NEXT="last_connect_time"/>
-        <FIELD NAME="last_connect_time" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="portno" NEXT="last_log_id"/>
-        <FIELD NAME="last_log_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="last_connect_time" NEXT="force_theme"/>
-        <FIELD NAME="force_theme" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="last_log_id" NEXT="theme"/>
+        <FIELD NAME="public_key_expires" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="public_key" NEXT="transport"/>
+        <FIELD NAME="transport" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="public_key_expires" NEXT="portno"/>
+        <FIELD NAME="portno" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="transport" NEXT="last_connect_time"/>
+        <FIELD NAME="last_connect_time" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="portno" NEXT="last_log_id"/>
+        <FIELD NAME="last_log_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="last_connect_time" NEXT="force_theme"/>
+        <FIELD NAME="force_theme" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="last_log_id" NEXT="theme"/>
         <FIELD NAME="theme" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="force_theme" NEXT="applicationid"/>
-        <FIELD NAME="applicationid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="theme"/>
+        <FIELD NAME="applicationid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="theme"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_host table" NEXT="applicationid"/>
@@ -1484,11 +1484,11 @@
     </TABLE>
     <TABLE NAME="mnet_host2service" COMMENT="Information about the services for a given host" PREVIOUS="mnet_host" NEXT="mnet_log">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="hostid"/>
-        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="serviceid"/>
-        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hostid" NEXT="publish"/>
-        <FIELD NAME="publish" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="serviceid" NEXT="subscribe"/>
-        <FIELD NAME="subscribe" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="hostid"/>
+        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="serviceid"/>
+        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hostid" NEXT="publish"/>
+        <FIELD NAME="publish" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="serviceid" NEXT="subscribe"/>
+        <FIELD NAME="subscribe" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_host2service table"/>
@@ -1499,16 +1499,16 @@
     </TABLE>
     <TABLE NAME="mnet_log" COMMENT="Store session data from users migrating to other sites" PREVIOUS="mnet_host2service" NEXT="mnet_rpc">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="hostid"/>
-        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique host ID" PREVIOUS="id" NEXT="remoteid"/>
-        <FIELD NAME="remoteid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hostid" NEXT="time"/>
-        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="remoteid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="time" NEXT="ip"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="hostid"/>
+        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique host ID" PREVIOUS="id" NEXT="remoteid"/>
+        <FIELD NAME="remoteid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hostid" NEXT="time"/>
+        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="remoteid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="time" NEXT="ip"/>
         <FIELD NAME="ip" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="coursename"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="coursename"/>
         <FIELD NAME="coursename" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="module"/>
         <FIELD NAME="module" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="coursename" NEXT="cmid"/>
-        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="action"/>
+        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="module" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="cmid" NEXT="url"/>
         <FIELD NAME="url" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="info"/>
         <FIELD NAME="info" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="url"/>
@@ -1522,17 +1522,17 @@
     </TABLE>
     <TABLE NAME="mnet_rpc" COMMENT="Functions or methods that we may publish or subscribe to" PREVIOUS="mnet_log" NEXT="mnet_remote_rpc">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Unique Function ID" NEXT="functionname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Unique Function ID" NEXT="functionname"/>
         <FIELD NAME="functionname" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="xmlrpcpath"/>
         <FIELD NAME="xmlrpcpath" TYPE="char" LENGTH="80" NOTNULL="true" SEQUENCE="false" PREVIOUS="functionname" NEXT="plugintype"/>
         <FIELD NAME="plugintype" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="xmlrpcpath" NEXT="pluginname"/>
         <FIELD NAME="pluginname" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="plugintype" NEXT="enabled"/>
-        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pluginname" NEXT="help"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pluginname" NEXT="help"/>
         <FIELD NAME="help" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="enabled" NEXT="profile"/>
         <FIELD NAME="profile" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" COMMENT="Method signature" PREVIOUS="help" NEXT="filename"/>
         <FIELD NAME="filename" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="profile" NEXT="classname"/>
         <FIELD NAME="classname" TYPE="char" LENGTH="150" NOTNULL="false" SEQUENCE="false" PREVIOUS="filename" NEXT="static"/>
-        <FIELD NAME="static" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" PREVIOUS="classname"/>
+        <FIELD NAME="static" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" PREVIOUS="classname"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_rpc table"/>
@@ -1543,12 +1543,12 @@
     </TABLE>
     <TABLE NAME="mnet_remote_rpc" COMMENT="This table describes functions that might be called remotely (we have less information about them than local functions)" PREVIOUS="mnet_rpc" NEXT="mnet_service">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="functionname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="functionname"/>
         <FIELD NAME="functionname" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="xmlrpcpath"/>
         <FIELD NAME="xmlrpcpath" TYPE="char" LENGTH="80" NOTNULL="true" SEQUENCE="false" PREVIOUS="functionname" NEXT="plugintype"/>
         <FIELD NAME="plugintype" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="xmlrpcpath" NEXT="pluginname"/>
         <FIELD NAME="pluginname" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" PREVIOUS="plugintype" NEXT="enabled"/>
-        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" PREVIOUS="pluginname"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" SEQUENCE="false" PREVIOUS="pluginname"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1556,11 +1556,11 @@
     </TABLE>
     <TABLE NAME="mnet_service" COMMENT="A service is a group of functions" PREVIOUS="mnet_remote_rpc" NEXT="mnet_service2rpc">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Unique Service ID" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Unique Service ID" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="description"/>
         <FIELD NAME="description" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="apiversion"/>
         <FIELD NAME="apiversion" TYPE="char" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="description" NEXT="offer"/>
-        <FIELD NAME="offer" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Do we even offer this service?" PREVIOUS="apiversion"/>
+        <FIELD NAME="offer" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Do we even offer this service?" PREVIOUS="apiversion"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_service table"/>
@@ -1568,9 +1568,9 @@
     </TABLE>
     <TABLE NAME="mnet_service2rpc" COMMENT="Group functions or methods under a service" PREVIOUS="mnet_service" NEXT="mnet_remote_service2rpc">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="serviceid"/>
-        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique service ID" PREVIOUS="id" NEXT="rpcid"/>
-        <FIELD NAME="rpcid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique Function ID" PREVIOUS="serviceid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="serviceid"/>
+        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique service ID" PREVIOUS="id" NEXT="rpcid"/>
+        <FIELD NAME="rpcid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique Function ID" PREVIOUS="serviceid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_service2rpc table"/>
@@ -1581,9 +1581,9 @@
     </TABLE>
     <TABLE NAME="mnet_remote_service2rpc" COMMENT="Group functions or methods under a service" PREVIOUS="mnet_service2rpc" NEXT="mnet_session">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="serviceid"/>
-        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique service ID" PREVIOUS="id" NEXT="rpcid"/>
-        <FIELD NAME="rpcid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique Function ID" PREVIOUS="serviceid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="serviceid"/>
+        <FIELD NAME="serviceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique service ID" PREVIOUS="id" NEXT="rpcid"/>
+        <FIELD NAME="rpcid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique Function ID" PREVIOUS="serviceid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_remote_service2rpc table"/>
@@ -1594,15 +1594,15 @@
     </TABLE>
     <TABLE NAME="mnet_session" COMMENT="Store session data from users migrating to other sites" PREVIOUS="mnet_remote_service2rpc" NEXT="mnet_sso_access_control">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique user ID" PREVIOUS="id" NEXT="username"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique user ID" PREVIOUS="id" NEXT="username"/>
         <FIELD NAME="username" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Unique username" PREVIOUS="userid" NEXT="token"/>
         <FIELD NAME="token" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="Unique SHA1 Token" PREVIOUS="username" NEXT="mnethostid"/>
-        <FIELD NAME="mnethostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique remote host ID" PREVIOUS="token" NEXT="useragent"/>
+        <FIELD NAME="mnethostid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Unique remote host ID" PREVIOUS="token" NEXT="useragent"/>
         <FIELD NAME="useragent" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="SHA1 hash of User Agent" PREVIOUS="mnethostid" NEXT="confirm_timeout"/>
-        <FIELD NAME="confirm_timeout" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="UNIX timestamp for expiry of session" PREVIOUS="useragent" NEXT="session_id"/>
+        <FIELD NAME="confirm_timeout" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="UNIX timestamp for expiry of session" PREVIOUS="useragent" NEXT="session_id"/>
         <FIELD NAME="session_id" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="The PHP Session ID" PREVIOUS="confirm_timeout" NEXT="expires"/>
-        <FIELD NAME="expires" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Expire time of session on peer" PREVIOUS="session_id"/>
+        <FIELD NAME="expires" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Expire time of session on peer" PREVIOUS="session_id"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the mnet_session table"/>
@@ -1613,9 +1613,9 @@
     </TABLE>
     <TABLE NAME="mnet_sso_access_control" COMMENT="Users by host permitted (or not) to login from a remote provider" PREVIOUS="mnet_session" NEXT="events_queue">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="username"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Required ID field" NEXT="username"/>
         <FIELD NAME="username" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Username" PREVIOUS="id" NEXT="mnet_host_id"/>
-        <FIELD NAME="mnet_host_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of mnet host" PREVIOUS="username" NEXT="accessctrl"/>
+        <FIELD NAME="mnet_host_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id of mnet host" PREVIOUS="username" NEXT="accessctrl"/>
         <FIELD NAME="accessctrl" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="allow" SEQUENCE="false" COMMENT="Whether or not this user/host can login" PREVIOUS="mnet_host_id"/>
       </FIELDS>
       <KEYS>
@@ -1627,11 +1627,11 @@
     </TABLE>
     <TABLE NAME="events_queue" COMMENT="This table is for storing queued events. It stores only one copy of the eventdata here, and entries from this table are being references by the event_queue_handlers table." PREVIOUS="mnet_sso_access_control" NEXT="events_handlers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="eventdata"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="eventdata"/>
         <FIELD NAME="eventdata" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="serialized version of the data object passed to the event handler." PREVIOUS="id" NEXT="stackdump"/>
         <FIELD NAME="stackdump" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="serialized debug_backtrace showing where the event was fired from" PREVIOUS="eventdata" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="$USER-&amp;gt;id when the event was fired" PREVIOUS="stackdump" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time stamp of the first time this was added" PREVIOUS="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="$USER-&amp;gt;id when the event was fired" PREVIOUS="stackdump" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time stamp of the first time this was added" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -1640,14 +1640,14 @@
     </TABLE>
     <TABLE NAME="events_handlers" COMMENT="This table is for storing which components requests what type of event, and the location of the responsible handlers. For example, the assignment registers 'grade_updated' event with a function assignment_grade_handler() that should be called event time an 'grade_updated' event is triggered by grade_update() function." PREVIOUS="events_queue" NEXT="events_queue_handlers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="eventname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="eventname"/>
         <FIELD NAME="eventname" TYPE="char" LENGTH="166" NOTNULL="true" SEQUENCE="false" COMMENT="name of the event, e.g. 'grade_updated'" PREVIOUS="id" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="166" NOTNULL="true" SEQUENCE="false" COMMENT="e.g. moodle, mod_forum, block_rss_client" PREVIOUS="eventname" NEXT="handlerfile"/>
         <FIELD NAME="handlerfile" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="path to the file of the function, eg /grade/export/lib.php" PREVIOUS="component" NEXT="handlerfunction"/>
         <FIELD NAME="handlerfunction" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="serialized string or array describing function, suitable to be passed to call_user_func()" PREVIOUS="handlerfile" NEXT="schedule"/>
         <FIELD NAME="schedule" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="'cron' or 'instant'." PREVIOUS="handlerfunction" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="number of failed attempts to process this handler" PREVIOUS="schedule" NEXT="internal"/>
-        <FIELD NAME="internal" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="1 means standard plugin handler, 0 indicates if event handler sends data to external systems, this is used for example to prevent immediate sending of events from pending db transactions" PREVIOUS="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="number of failed attempts to process this handler" PREVIOUS="schedule" NEXT="internal"/>
+        <FIELD NAME="internal" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="1 means standard plugin handler, 0 indicates if event handler sends data to external systems, this is used for example to prevent immediate sending of events from pending db transactions" PREVIOUS="status"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -1658,12 +1658,12 @@
     </TABLE>
     <TABLE NAME="events_queue_handlers" COMMENT="This is the list of queued handlers for processing. The event object is retrieved from the events_queue table. When no further reference is made to the event_queues table, the corresponding entry in the events_queue table should be deleted. Entry should get deleted after a successful event processing by the specified handler." PREVIOUS="events_handlers" NEXT="grade_outcomes">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="queuedeventid"/>
-        <FIELD NAME="queuedeventid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="foreign key id corresponding to the id of the event_queues table" PREVIOUS="id" NEXT="handlerid"/>
-        <FIELD NAME="handlerid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="foreign key id corresponding to the id of the event_handlers table" PREVIOUS="queuedeventid" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" COMMENT="number of failed attempts to process this handler" PREVIOUS="handlerid" NEXT="errormessage"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="queuedeventid"/>
+        <FIELD NAME="queuedeventid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="foreign key id corresponding to the id of the event_queues table" PREVIOUS="id" NEXT="handlerid"/>
+        <FIELD NAME="handlerid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="foreign key id corresponding to the id of the event_handlers table" PREVIOUS="queuedeventid" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="number of failed attempts to process this handler" PREVIOUS="handlerid" NEXT="errormessage"/>
         <FIELD NAME="errormessage" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="if an error happened last time we tried to process this event, record it here." PREVIOUS="status" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time stamp of the last attempt to run this from the queue" PREVIOUS="errormessage"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time stamp of the last attempt to run this from the queue" PREVIOUS="errormessage"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="queuedeventid"/>
@@ -1673,16 +1673,16 @@
     </TABLE>
     <TABLE NAME="grade_outcomes" COMMENT="This table describes the outcomes used in the system. An outcome is a statement tied to a rubric scale from low to high, such as “Not met, Borderline, Met” (stored as 0,1 or 2)" PREVIOUS="events_queue_handlers" NEXT="grade_outcomes_courses">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="id of the table" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Mostly these are defined site wide ie NULL" PREVIOUS="id" NEXT="shortname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="id of the table" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Mostly these are defined site wide ie NULL" PREVIOUS="id" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The short name or code for this outcome statement" PREVIOUS="courseid" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="The full description of the outcome (usually 1 sentence)" PREVIOUS="shortname" NEXT="scaleid"/>
-        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The recommended scale for this outcome." PREVIOUS="fullname" NEXT="description"/>
+        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The recommended scale for this outcome." PREVIOUS="fullname" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="outcome description" PREVIOUS="scaleid" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the time this outcome was first created" PREVIOUS="descriptionformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the time this outcome was last updated" PREVIOUS="timecreated" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the time this outcome was first created" PREVIOUS="descriptionformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the time this outcome was last updated" PREVIOUS="timecreated" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -1694,9 +1694,9 @@
     </TABLE>
     <TABLE NAME="grade_outcomes_courses" COMMENT="stores what outcomes are used in what courses." PREVIOUS="grade_outcomes" NEXT="grade_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the course" PREVIOUS="id" NEXT="outcomeid"/>
-        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the outcome" PREVIOUS="courseid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="id of the course" PREVIOUS="id" NEXT="outcomeid"/>
+        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="id of the outcome" PREVIOUS="courseid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -1707,21 +1707,21 @@
     </TABLE>
     <TABLE NAME="grade_categories" COMMENT="This table keeps information about categories, used for grouping items." PREVIOUS="grade_outcomes_courses" NEXT="grade_items">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The course this grade category is part of" PREVIOUS="id" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Categories can be hierarchical" PREVIOUS="courseid" NEXT="depth"/>
-        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="How many parents does this category have?" PREVIOUS="parent" NEXT="path"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The course this grade category is part of" PREVIOUS="id" NEXT="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Categories can be hierarchical" PREVIOUS="courseid" NEXT="depth"/>
+        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="How many parents does this category have?" PREVIOUS="parent" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="shows the path as /1/2/3 (like course_categories)" PREVIOUS="depth" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The name of this grade category" PREVIOUS="path" NEXT="aggregation"/>
-        <FIELD NAME="aggregation" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="A constant pointing to one of the predefined aggregation strategies (none, mean,median,sum, etc)" PREVIOUS="fullname" NEXT="keephigh"/>
-        <FIELD NAME="keephigh" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Keep only the X highest items" PREVIOUS="aggregation" NEXT="droplow"/>
-        <FIELD NAME="droplow" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Drop the X lowest items" PREVIOUS="keephigh" NEXT="aggregateonlygraded"/>
-        <FIELD NAME="aggregateonlygraded" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="aggregate only graded activities" PREVIOUS="droplow" NEXT="aggregateoutcomes"/>
-        <FIELD NAME="aggregateoutcomes" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Aggregate outcomes" PREVIOUS="aggregateonlygraded" NEXT="aggregatesubcats"/>
-        <FIELD NAME="aggregatesubcats" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="ignore subcategories in aggregation" PREVIOUS="aggregateoutcomes" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="aggregatesubcats" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
+        <FIELD NAME="aggregation" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="A constant pointing to one of the predefined aggregation strategies (none, mean,median,sum, etc)" PREVIOUS="fullname" NEXT="keephigh"/>
+        <FIELD NAME="keephigh" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Keep only the X highest items" PREVIOUS="aggregation" NEXT="droplow"/>
+        <FIELD NAME="droplow" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Drop the X lowest items" PREVIOUS="keephigh" NEXT="aggregateonlygraded"/>
+        <FIELD NAME="aggregateonlygraded" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="aggregate only graded activities" PREVIOUS="droplow" NEXT="aggregateoutcomes"/>
+        <FIELD NAME="aggregateoutcomes" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Aggregate outcomes" PREVIOUS="aggregateonlygraded" NEXT="aggregatesubcats"/>
+        <FIELD NAME="aggregatesubcats" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="ignore subcategories in aggregation" PREVIOUS="aggregateoutcomes" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="aggregatesubcats" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -1731,35 +1731,35 @@
     </TABLE>
     <TABLE NAME="grade_items" COMMENT="This table keeps information about gradeable items (ie columns). If an activity (eg an assignment or quiz) has multiple grade_items associated with it (eg several outcomes or numerical grades), then there will be a corresponding multiple number of rows in this table." PREVIOUS="grade_categories" NEXT="grade_grades">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The course this item is part of" PREVIOUS="id" NEXT="categoryid"/>
-        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="(optional) the category group this item belongs to" PREVIOUS="courseid" NEXT="itemname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The course this item is part of" PREVIOUS="id" NEXT="categoryid"/>
+        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="(optional) the category group this item belongs to" PREVIOUS="courseid" NEXT="itemname"/>
         <FIELD NAME="itemname" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="The name of this item (pushed in by the module)" PREVIOUS="categoryid" NEXT="itemtype"/>
         <FIELD NAME="itemtype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" COMMENT="'mod', 'blocks', 'import', 'calculated' etc" PREVIOUS="itemname" NEXT="itemmodule"/>
         <FIELD NAME="itemmodule" TYPE="char" LENGTH="30" NOTNULL="false" SEQUENCE="false" COMMENT="'forum', 'quiz', 'csv', etc" PREVIOUS="itemtype" NEXT="iteminstance"/>
-        <FIELD NAME="iteminstance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the item module" PREVIOUS="itemmodule" NEXT="itemnumber"/>
-        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Can be used to distinguish multiple grades for an activity" PREVIOUS="iteminstance" NEXT="iteminfo"/>
+        <FIELD NAME="iteminstance" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="id of the item module" PREVIOUS="itemmodule" NEXT="itemnumber"/>
+        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Can be used to distinguish multiple grades for an activity" PREVIOUS="iteminstance" NEXT="iteminfo"/>
         <FIELD NAME="iteminfo" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="Info and notes about this item XXX" PREVIOUS="itemnumber" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Arbitrary idnumber provided by the module responsible" PREVIOUS="iteminfo" NEXT="calculation"/>
         <FIELD NAME="calculation" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="Formula describing how to derive this grade from other items, referring to them using giXXX where XXX is grade item id ... eg something like: =sin(square([#gi20#])) + [#gi30#]" PREVIOUS="idnumber" NEXT="gradetype"/>
-        <FIELD NAME="gradetype" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="0 = none, 1 = value, 2 = scale, 3 = text" PREVIOUS="calculation" NEXT="grademax"/>
-        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="What is the maximum allowable grade?" PREVIOUS="gradetype" NEXT="grademin"/>
-        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What is the minimum allowable grade?" PREVIOUS="grademax" NEXT="scaleid"/>
-        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one is it?" PREVIOUS="grademin" NEXT="outcomeid"/>
-        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is related to an outcome, which one is it?" PREVIOUS="scaleid" NEXT="gradepass"/>
-        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What grade is needed to pass? grademin &amp;lt; gradepass &amp;lt;= grademax" PREVIOUS="outcomeid" NEXT="multfactor"/>
-        <FIELD NAME="multfactor" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="1.0" SEQUENCE="false" DECIMALS="5" COMMENT="Multiply all grades by this" PREVIOUS="gradepass" NEXT="plusfactor"/>
-        <FIELD NAME="plusfactor" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Add this to all grades" PREVIOUS="multfactor" NEXT="aggregationcoef"/>
-        <FIELD NAME="aggregationcoef" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregation coefficient used for category weights or other aggregation types" PREVIOUS="plusfactor" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Sorting order of the columns" PREVIOUS="aggregationcoef" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Display as real grades, percentages (in reference to the minimum and maximum grades) or letters (A, B, C etc..), or course default (0)" PREVIOUS="sortorder" NEXT="decimals"/>
-        <FIELD NAME="decimals" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Also known as precision, the number of digits after the decimal point symbol." PREVIOUS="display" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="1 is hidden, &amp;gt; 1 is a date to hide until (prevents viewing)" PREVIOUS="decimals" NEXT="locked"/>
-        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="1 is locked, &amp;gt; 1 is a date to lock until (prevents update)" PREVIOUS="hidden" NEXT="locktime"/>
-        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="lock all final grades after this date" PREVIOUS="locked" NEXT="needsupdate"/>
-        <FIELD NAME="needsupdate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If this flag is set, then the whole column will be recalculated" PREVIOUS="locktime" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The first time this grade_item was created" PREVIOUS="needsupdate" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="timecreated"/>
+        <FIELD NAME="gradetype" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="0 = none, 1 = value, 2 = scale, 3 = text" PREVIOUS="calculation" NEXT="grademax"/>
+        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="What is the maximum allowable grade?" PREVIOUS="gradetype" NEXT="grademin"/>
+        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What is the minimum allowable grade?" PREVIOUS="grademax" NEXT="scaleid"/>
+        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one is it?" PREVIOUS="grademin" NEXT="outcomeid"/>
+        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is related to an outcome, which one is it?" PREVIOUS="scaleid" NEXT="gradepass"/>
+        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What grade is needed to pass? grademin &amp;lt; gradepass &amp;lt;= grademax" PREVIOUS="outcomeid" NEXT="multfactor"/>
+        <FIELD NAME="multfactor" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="1.0" SEQUENCE="false" DECIMALS="5" COMMENT="Multiply all grades by this" PREVIOUS="gradepass" NEXT="plusfactor"/>
+        <FIELD NAME="plusfactor" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Add this to all grades" PREVIOUS="multfactor" NEXT="aggregationcoef"/>
+        <FIELD NAME="aggregationcoef" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregation coefficient used for category weights or other aggregation types" PREVIOUS="plusfactor" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Sorting order of the columns" PREVIOUS="aggregationcoef" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Display as real grades, percentages (in reference to the minimum and maximum grades) or letters (A, B, C etc..), or course default (0)" PREVIOUS="sortorder" NEXT="decimals"/>
+        <FIELD NAME="decimals" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Also known as precision, the number of digits after the decimal point symbol." PREVIOUS="display" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 is hidden, &amp;gt; 1 is a date to hide until (prevents viewing)" PREVIOUS="decimals" NEXT="locked"/>
+        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 is locked, &amp;gt; 1 is a date to lock until (prevents update)" PREVIOUS="hidden" NEXT="locktime"/>
+        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="lock all final grades after this date" PREVIOUS="locked" NEXT="needsupdate"/>
+        <FIELD NAME="needsupdate" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this flag is set, then the whole column will be recalculated" PREVIOUS="locktime" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The first time this grade_item was created" PREVIOUS="needsupdate" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -1777,27 +1777,27 @@
     </TABLE>
     <TABLE NAME="grade_grades" COMMENT="grade_grades  This table keeps individual grades for each user and each item, exactly as imported or submitted by modules. The rawgrademax/min and rawscaleid are stored here to record the values at the time the grade was stored, because teachers might change this for an activity! All the results are normalised/resampled for the final grade value." PREVIOUS="grade_items" NEXT="grade_outcomes_history">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The item this grade belongs to" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The user who this grade is for" PREVIOUS="itemid" NEXT="rawgrade"/>
-        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="If the grade is a float value (or has been converted to one)" PREVIOUS="userid" NEXT="rawgrademax"/>
-        <FIELD NAME="rawgrademax" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum allowable grade when this was created" PREVIOUS="rawgrade" NEXT="rawgrademin"/>
-        <FIELD NAME="rawgrademin" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum allowable grade when this was created" PREVIOUS="rawgrademax" NEXT="rawscaleid"/>
-        <FIELD NAME="rawscaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one was it?" PREVIOUS="rawgrademin" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this grade" PREVIOUS="rawscaleid" NEXT="finalgrade"/>
-        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade (cached) after all calculations are made" PREVIOUS="usermodified" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="show 0, hide 1 or hide until date" PREVIOUS="finalgrade" NEXT="locked"/>
-        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="not locked 0, locked from date" PREVIOUS="hidden" NEXT="locktime"/>
-        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="automatic locking of final grade, 0 means none, date otherwise" PREVIOUS="locked" NEXT="exported"/>
-        <FIELD NAME="exported" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="date of last grade export, 0 if none" PREVIOUS="locktime" NEXT="overridden"/>
-        <FIELD NAME="overridden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="indicates grade overridden from gradebook, 0 means none, date means overridden" PREVIOUS="exported" NEXT="excluded"/>
-        <FIELD NAME="excluded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="grade excluded from aggregation functions, date means when excluded" PREVIOUS="overridden" NEXT="feedback"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="itemid"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The item this grade belongs to" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The user who this grade is for" PREVIOUS="itemid" NEXT="rawgrade"/>
+        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="If the grade is a float value (or has been converted to one)" PREVIOUS="userid" NEXT="rawgrademax"/>
+        <FIELD NAME="rawgrademax" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum allowable grade when this was created" PREVIOUS="rawgrade" NEXT="rawgrademin"/>
+        <FIELD NAME="rawgrademin" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum allowable grade when this was created" PREVIOUS="rawgrademax" NEXT="rawscaleid"/>
+        <FIELD NAME="rawscaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one was it?" PREVIOUS="rawgrademin" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this grade" PREVIOUS="rawscaleid" NEXT="finalgrade"/>
+        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade (cached) after all calculations are made" PREVIOUS="usermodified" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="show 0, hide 1 or hide until date" PREVIOUS="finalgrade" NEXT="locked"/>
+        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="not locked 0, locked from date" PREVIOUS="hidden" NEXT="locktime"/>
+        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="automatic locking of final grade, 0 means none, date otherwise" PREVIOUS="locked" NEXT="exported"/>
+        <FIELD NAME="exported" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="date of last grade export, 0 if none" PREVIOUS="locktime" NEXT="overridden"/>
+        <FIELD NAME="overridden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="indicates grade overridden from gradebook, 0 means none, date means overridden" PREVIOUS="exported" NEXT="excluded"/>
+        <FIELD NAME="excluded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="grade excluded from aggregation functions, date means when excluded" PREVIOUS="overridden" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="grading feedback" PREVIOUS="excluded" NEXT="feedbackformat"/>
-        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of feedback text" PREVIOUS="feedback" NEXT="information"/>
+        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of feedback text" PREVIOUS="feedback" NEXT="information"/>
         <FIELD NAME="information" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="optiona information" PREVIOUS="feedbackformat" NEXT="informationformat"/>
-        <FIELD NAME="informationformat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of information text" PREVIOUS="information" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the time this grade was first created" PREVIOUS="informationformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the time this grade was last modified" PREVIOUS="timecreated"/>
+        <FIELD NAME="informationformat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of information text" PREVIOUS="information" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the time this grade was first created" PREVIOUS="informationformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the time this grade was last modified" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="itemid"/>
@@ -1813,18 +1813,18 @@
     </TABLE>
     <TABLE NAME="grade_outcomes_history" COMMENT="History table" PREVIOUS="grade_grades" NEXT="grade_categories_history">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
-        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="What caused the modification? manual/module/import/..." PREVIOUS="oldid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
-        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Mostly these are defined site wide ie NULL" PREVIOUS="loggeduser" NEXT="shortname"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
+        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Mostly these are defined site wide ie NULL" PREVIOUS="loggeduser" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The short name or code for this outcome statement" PREVIOUS="courseid" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="The full description of the outcome (usually 1 sentence)" PREVIOUS="shortname" NEXT="scaleid"/>
-        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The recommended scale for this outcome." PREVIOUS="fullname" NEXT="description"/>
+        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The recommended scale for this outcome." PREVIOUS="fullname" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Outcome description" PREVIOUS="scaleid" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="oldid"/>
@@ -1839,24 +1839,24 @@
     </TABLE>
     <TABLE NAME="grade_categories_history" COMMENT="History of grade_categories" PREVIOUS="grade_outcomes_history" NEXT="grade_items_history">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
-        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="What caused the modification? manual/module/import/..." PREVIOUS="oldid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
-        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The course this grade category is part of" PREVIOUS="loggeduser" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Categories can be hierarchical" PREVIOUS="courseid" NEXT="depth"/>
-        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="How many parents does this category have?" PREVIOUS="parent" NEXT="path"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
+        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The course this grade category is part of" PREVIOUS="loggeduser" NEXT="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Categories can be hierarchical" PREVIOUS="courseid" NEXT="depth"/>
+        <FIELD NAME="depth" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="How many parents does this category have?" PREVIOUS="parent" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="shows the path as /1/2/3 (like course_categories)" PREVIOUS="depth" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The name of this grade category" PREVIOUS="path" NEXT="aggregation"/>
-        <FIELD NAME="aggregation" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="A constant pointing to one of the predefined aggregation strategies (none, mean,median,sum, etc)" PREVIOUS="fullname" NEXT="keephigh"/>
-        <FIELD NAME="keephigh" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Keep only the X highest items" PREVIOUS="aggregation" NEXT="droplow"/>
-        <FIELD NAME="droplow" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Drop the X lowest items" PREVIOUS="keephigh" NEXT="aggregateonlygraded"/>
-        <FIELD NAME="aggregateonlygraded" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="aggregate only graded items" PREVIOUS="droplow" NEXT="aggregateoutcomes"/>
-        <FIELD NAME="aggregateoutcomes" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Aggregate outcomes" PREVIOUS="aggregateonlygraded" NEXT="aggregatesubcats"/>
-        <FIELD NAME="aggregatesubcats" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="ignore subcategories in aggregation" PREVIOUS="aggregateoutcomes" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="aggregatesubcats"/>
+        <FIELD NAME="aggregation" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="A constant pointing to one of the predefined aggregation strategies (none, mean,median,sum, etc)" PREVIOUS="fullname" NEXT="keephigh"/>
+        <FIELD NAME="keephigh" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Keep only the X highest items" PREVIOUS="aggregation" NEXT="droplow"/>
+        <FIELD NAME="droplow" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Drop the X lowest items" PREVIOUS="keephigh" NEXT="aggregateonlygraded"/>
+        <FIELD NAME="aggregateonlygraded" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="aggregate only graded items" PREVIOUS="droplow" NEXT="aggregateoutcomes"/>
+        <FIELD NAME="aggregateoutcomes" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Aggregate outcomes" PREVIOUS="aggregateonlygraded" NEXT="aggregatesubcats"/>
+        <FIELD NAME="aggregatesubcats" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="ignore subcategories in aggregation" PREVIOUS="aggregateoutcomes" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="aggregatesubcats"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="oldid"/>
@@ -1871,38 +1871,38 @@
     </TABLE>
     <TABLE NAME="grade_items_history" COMMENT="History of grade_items" PREVIOUS="grade_categories_history" NEXT="grade_grades_history">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
-        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="What caused the modification? manual/module/import/..." PREVIOUS="oldid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
-        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The course this item is part of" PREVIOUS="loggeduser" NEXT="categoryid"/>
-        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="(optional) the category group this item belongs to" PREVIOUS="courseid" NEXT="itemname"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
+        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The course this item is part of" PREVIOUS="loggeduser" NEXT="categoryid"/>
+        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="(optional) the category group this item belongs to" PREVIOUS="courseid" NEXT="itemname"/>
         <FIELD NAME="itemname" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="The name of this item (pushed in by the module)" PREVIOUS="categoryid" NEXT="itemtype"/>
         <FIELD NAME="itemtype" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" COMMENT="'mod', 'blocks', 'import', 'calculated' etc" PREVIOUS="itemname" NEXT="itemmodule"/>
         <FIELD NAME="itemmodule" TYPE="char" LENGTH="30" NOTNULL="false" SEQUENCE="false" COMMENT="'forum', 'quiz', 'csv', etc" PREVIOUS="itemtype" NEXT="iteminstance"/>
-        <FIELD NAME="iteminstance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the item module" PREVIOUS="itemmodule" NEXT="itemnumber"/>
-        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Can be used to distinguish multiple grades for an activity" PREVIOUS="iteminstance" NEXT="iteminfo"/>
+        <FIELD NAME="iteminstance" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="id of the item module" PREVIOUS="itemmodule" NEXT="itemnumber"/>
+        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Can be used to distinguish multiple grades for an activity" PREVIOUS="iteminstance" NEXT="iteminfo"/>
         <FIELD NAME="iteminfo" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="Info and notes about this item XXX" PREVIOUS="itemnumber" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Arbitrary idnumber provided by the module responsible" PREVIOUS="iteminfo" NEXT="calculation"/>
         <FIELD NAME="calculation" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="Formula describing how to derive this grade from other items, referring to them using giXXX where XXX is grade item id ... eg something like: =sin(square([#gi20#])) + [#gi30#]" PREVIOUS="idnumber" NEXT="gradetype"/>
-        <FIELD NAME="gradetype" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="0 = none, 1 = value, 2 = scale, 3 = text" PREVIOUS="calculation" NEXT="grademax"/>
-        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="What is the maximum allowable grade?" PREVIOUS="gradetype" NEXT="grademin"/>
-        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What is the minimum allowable grade?" PREVIOUS="grademax" NEXT="scaleid"/>
-        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one is it?" PREVIOUS="grademin" NEXT="outcomeid"/>
-        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is related to an outcome, which one is it?" PREVIOUS="scaleid" NEXT="gradepass"/>
-        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What grade is needed to pass? grademin &amp;lt; gradepass &amp;lt;= grademax" PREVIOUS="outcomeid" NEXT="multfactor"/>
-        <FIELD NAME="multfactor" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="1.0" SEQUENCE="false" DECIMALS="5" COMMENT="Multiply all grades by this" PREVIOUS="gradepass" NEXT="plusfactor"/>
-        <FIELD NAME="plusfactor" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Add this to all grades" PREVIOUS="multfactor" NEXT="aggregationcoef"/>
-        <FIELD NAME="aggregationcoef" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregation coefficient used for category weights or other aggregation types" PREVIOUS="plusfactor" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Sorting order of the columns" PREVIOUS="aggregationcoef" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="1 is hidden, &amp;gt; 1 is a date to hide until (prevents viewing)" PREVIOUS="sortorder" NEXT="locked"/>
-        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="1 is locked, &amp;gt; 1 is a date to lock until (prevents update)" PREVIOUS="hidden" NEXT="locktime"/>
-        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="lock all final grades after this date" PREVIOUS="locked" NEXT="needsupdate"/>
-        <FIELD NAME="needsupdate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If this flag is set, then the whole column will be recalculated" PREVIOUS="locktime" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="needsupdate" NEXT="decimals"/>
-        <FIELD NAME="decimals" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="display"/>
+        <FIELD NAME="gradetype" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="0 = none, 1 = value, 2 = scale, 3 = text" PREVIOUS="calculation" NEXT="grademax"/>
+        <FIELD NAME="grademax" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="What is the maximum allowable grade?" PREVIOUS="gradetype" NEXT="grademin"/>
+        <FIELD NAME="grademin" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What is the minimum allowable grade?" PREVIOUS="grademax" NEXT="scaleid"/>
+        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one is it?" PREVIOUS="grademin" NEXT="outcomeid"/>
+        <FIELD NAME="outcomeid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is related to an outcome, which one is it?" PREVIOUS="scaleid" NEXT="gradepass"/>
+        <FIELD NAME="gradepass" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="What grade is needed to pass? grademin &amp;lt; gradepass &amp;lt;= grademax" PREVIOUS="outcomeid" NEXT="multfactor"/>
+        <FIELD NAME="multfactor" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="1.0" SEQUENCE="false" DECIMALS="5" COMMENT="Multiply all grades by this" PREVIOUS="gradepass" NEXT="plusfactor"/>
+        <FIELD NAME="plusfactor" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Add this to all grades" PREVIOUS="multfactor" NEXT="aggregationcoef"/>
+        <FIELD NAME="aggregationcoef" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregation coefficient used for category weights or other aggregation types" PREVIOUS="plusfactor" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Sorting order of the columns" PREVIOUS="aggregationcoef" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 is hidden, &amp;gt; 1 is a date to hide until (prevents viewing)" PREVIOUS="sortorder" NEXT="locked"/>
+        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 is locked, &amp;gt; 1 is a date to lock until (prevents update)" PREVIOUS="hidden" NEXT="locktime"/>
+        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="lock all final grades after this date" PREVIOUS="locked" NEXT="needsupdate"/>
+        <FIELD NAME="needsupdate" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this flag is set, then the whole column will be recalculated" PREVIOUS="locktime" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="needsupdate" NEXT="decimals"/>
+        <FIELD NAME="decimals" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" PREVIOUS="display"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="oldid"/>
@@ -1919,30 +1919,30 @@
     </TABLE>
     <TABLE NAME="grade_grades_history" COMMENT="History table" PREVIOUS="grade_items_history" NEXT="grade_import_newitem">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="action"/>
-        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="action"/>
+        <FIELD NAME="action" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="created/modified/deleted constants" PREVIOUS="id" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="action" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="What caused the modification? manual/module/import/..." PREVIOUS="oldid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
-        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The item this grade belongs to" PREVIOUS="loggeduser" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The user who this grade is for" PREVIOUS="itemid" NEXT="rawgrade"/>
-        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="If the grade is a float value (or has been converted to one)" PREVIOUS="userid" NEXT="rawgrademax"/>
-        <FIELD NAME="rawgrademax" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum allowable grade when this was created" PREVIOUS="rawgrade" NEXT="rawgrademin"/>
-        <FIELD NAME="rawgrademin" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum allowable grade when this was created" PREVIOUS="rawgrademax" NEXT="rawscaleid"/>
-        <FIELD NAME="rawscaleid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one was it?" PREVIOUS="rawgrademin" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the userid of the person who last modified this grade" PREVIOUS="rawscaleid" NEXT="finalgrade"/>
-        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade (cached) after all calculations are made" PREVIOUS="usermodified" NEXT="hidden"/>
-        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="show 0, hide 1 or hide until date" PREVIOUS="finalgrade" NEXT="locked"/>
-        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="not locked 0, locked from date" PREVIOUS="hidden" NEXT="locktime"/>
-        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="automatic locking of final grade, 0 means none, date otherwise" PREVIOUS="locked" NEXT="exported"/>
-        <FIELD NAME="exported" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="date of last grade export, 0 if none" PREVIOUS="locktime" NEXT="overridden"/>
-        <FIELD NAME="overridden" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="indicates grade overridden from gradebook, 0 means none, date means overridden" PREVIOUS="exported" NEXT="excluded"/>
-        <FIELD NAME="excluded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="grade excluded from aggregation functions, date means when excluded" PREVIOUS="overridden" NEXT="feedback"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The last time this grade_item was modified" PREVIOUS="source" NEXT="loggeduser"/>
+        <FIELD NAME="loggeduser" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this outcome" PREVIOUS="timemodified" NEXT="itemid"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The item this grade belongs to" PREVIOUS="loggeduser" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The user who this grade is for" PREVIOUS="itemid" NEXT="rawgrade"/>
+        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="If the grade is a float value (or has been converted to one)" PREVIOUS="userid" NEXT="rawgrademax"/>
+        <FIELD NAME="rawgrademax" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum allowable grade when this was created" PREVIOUS="rawgrade" NEXT="rawgrademin"/>
+        <FIELD NAME="rawgrademin" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The minimum allowable grade when this was created" PREVIOUS="rawgrademax" NEXT="rawscaleid"/>
+        <FIELD NAME="rawscaleid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="If this grade is based on a scale, which one was it?" PREVIOUS="rawgrademin" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the userid of the person who last modified this grade" PREVIOUS="rawscaleid" NEXT="finalgrade"/>
+        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The final grade (cached) after all calculations are made" PREVIOUS="usermodified" NEXT="hidden"/>
+        <FIELD NAME="hidden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="show 0, hide 1 or hide until date" PREVIOUS="finalgrade" NEXT="locked"/>
+        <FIELD NAME="locked" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="not locked 0, locked from date" PREVIOUS="hidden" NEXT="locktime"/>
+        <FIELD NAME="locktime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="automatic locking of final grade, 0 means none, date otherwise" PREVIOUS="locked" NEXT="exported"/>
+        <FIELD NAME="exported" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="date of last grade export, 0 if none" PREVIOUS="locktime" NEXT="overridden"/>
+        <FIELD NAME="overridden" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="indicates grade overridden from gradebook, 0 means none, date means overridden" PREVIOUS="exported" NEXT="excluded"/>
+        <FIELD NAME="excluded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="grade excluded from aggregation functions, date means when excluded" PREVIOUS="overridden" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="grading feedback" PREVIOUS="excluded" NEXT="feedbackformat"/>
-        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of feedback text" PREVIOUS="feedback" NEXT="information"/>
+        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of feedback text" PREVIOUS="feedback" NEXT="information"/>
         <FIELD NAME="information" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="optiona information" PREVIOUS="feedbackformat" NEXT="informationformat"/>
-        <FIELD NAME="informationformat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of information text" PREVIOUS="information"/>
+        <FIELD NAME="informationformat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="format of information text" PREVIOUS="information"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="oldid"/>
@@ -1959,10 +1959,10 @@
     </TABLE>
     <TABLE NAME="grade_import_newitem" COMMENT="temporary table for storing new grade_item names from grade import" PREVIOUS="grade_grades_history" NEXT="grade_import_values">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="itemname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="itemname"/>
         <FIELD NAME="itemname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="new grade item name" PREVIOUS="id" NEXT="importcode"/>
-        <FIELD NAME="importcode" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="import batch code for identification" PREVIOUS="itemname" NEXT="importer"/>
-        <FIELD NAME="importer" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="user importing the data" PREVIOUS="importcode"/>
+        <FIELD NAME="importcode" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="import batch code for identification" PREVIOUS="itemname" NEXT="importer"/>
+        <FIELD NAME="importer" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="user importing the data" PREVIOUS="importcode"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="importer"/>
@@ -1971,14 +1971,14 @@
     </TABLE>
     <TABLE NAME="grade_import_values" COMMENT="Temporary table for importing grades" PREVIOUS="grade_import_newitem" NEXT="tag">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="if set, this points to existing grade_items id" PREVIOUS="id" NEXT="newgradeitem"/>
-        <FIELD NAME="newgradeitem" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="if set, points to the id of grade_import_newitem" PREVIOUS="itemid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newgradeitem" NEXT="finalgrade"/>
-        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="raw grade value" PREVIOUS="userid" NEXT="feedback"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="itemid"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="if set, this points to existing grade_items id" PREVIOUS="id" NEXT="newgradeitem"/>
+        <FIELD NAME="newgradeitem" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="if set, points to the id of grade_import_newitem" PREVIOUS="itemid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="newgradeitem" NEXT="finalgrade"/>
+        <FIELD NAME="finalgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="raw grade value" PREVIOUS="userid" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" PREVIOUS="finalgrade" NEXT="importcode"/>
-        <FIELD NAME="importcode" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="similar to backup_code, a unique batch code for identifying one batch of imports" PREVIOUS="feedback" NEXT="importer"/>
-        <FIELD NAME="importer" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="importcode"/>
+        <FIELD NAME="importcode" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="similar to backup_code, a unique batch code for identifying one batch of imports" PREVIOUS="feedback" NEXT="importer"/>
+        <FIELD NAME="importer" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="importcode"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="itemid"/>
@@ -1989,15 +1989,15 @@
     </TABLE>
     <TABLE NAME="tag" COMMENT="Tag table - this generic table will replace the old &quot;tags&quot; table." PREVIOUS="grade_import_values" NEXT="tag_correlation">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="rawname"/>
         <FIELD NAME="rawname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The raw, unnormalised name for the tag as entered by users" PREVIOUS="name" NEXT="tagtype"/>
         <FIELD NAME="tagtype" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="rawname" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="tagtype" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="flag"/>
-        <FIELD NAME="flag" TYPE="int" LENGTH="4" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="a tag can be 'flagged' as inappropriate" PREVIOUS="descriptionformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="flag"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="flag"/>
+        <FIELD NAME="flag" TYPE="int" LENGTH="4" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="a tag can be 'flagged' as inappropriate" PREVIOUS="descriptionformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="flag"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -2009,8 +2009,8 @@
     </TABLE>
     <TABLE NAME="tag_correlation" COMMENT="The rationale for the 'tag_correlation' table is performance.   It works as a cache for a potentially heavy load query done at the 'tag_instance' table.   So, the 'tag_correlation' table stores redundant information derived from the 'tag_instance' table" PREVIOUS="tag" NEXT="tag_instance">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="tagid"/>
-        <FIELD NAME="tagid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="correlatedtags"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="tagid"/>
+        <FIELD NAME="tagid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="correlatedtags"/>
         <FIELD NAME="correlatedtags" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="tagid"/>
       </FIELDS>
       <KEYS>
@@ -2020,13 +2020,13 @@
     </TABLE>
     <TABLE NAME="tag_instance" COMMENT="tag_instance table holds the information of associations between tags and other items" PREVIOUS="tag_correlation" NEXT="groups">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="tagid"/>
-        <FIELD NAME="tagid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="itemtype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="tagid"/>
+        <FIELD NAME="tagid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="itemtype"/>
         <FIELD NAME="itemtype" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="tagid" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="itemtype" NEXT="tiuserid"/>
-        <FIELD NAME="tiuserid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="itemid" NEXT="ordering"/>
-        <FIELD NAME="ordering" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Maintains the order of the tag instances of an item" PREVIOUS="tiuserid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="timemodified" PREVIOUS="ordering"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="itemtype" NEXT="tiuserid"/>
+        <FIELD NAME="tiuserid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="itemid" NEXT="ordering"/>
+        <FIELD NAME="ordering" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Maintains the order of the tag instances of an item" PREVIOUS="tiuserid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="timemodified" PREVIOUS="ordering"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="tagid"/>
@@ -2038,16 +2038,16 @@
     </TABLE>
     <TABLE NAME="groups" COMMENT="Each record represents a group." PREVIOUS="tag_instance" NEXT="groupings">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="254" NOTNULL="true" SEQUENCE="false" COMMENT="Short human readable unique name for the group." PREVIOUS="courseid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="enrolmentkey"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="enrolmentkey"/>
         <FIELD NAME="enrolmentkey" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="picture"/>
-        <FIELD NAME="picture" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="enrolmentkey" NEXT="hidepicture"/>
-        <FIELD NAME="hidepicture" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="picture" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidepicture" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="picture" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="enrolmentkey" NEXT="hidepicture"/>
+        <FIELD NAME="hidepicture" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="picture" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidepicture" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -2056,14 +2056,14 @@
     </TABLE>
     <TABLE NAME="groupings" COMMENT="A grouping is a collection of groups. WAS: groups_groupings" PREVIOUS="groups" NEXT="groups_members">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Short human readable unique name for group." PREVIOUS="courseid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="configdata"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="configdata"/>
         <FIELD NAME="configdata" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="extra configuration data - may be used by group IU tools" PREVIOUS="descriptionformat" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="configdata" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="configdata" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -2072,10 +2072,10 @@
     </TABLE>
     <TABLE NAME="groups_members" COMMENT="Link a user to a group." PREVIOUS="groupings" NEXT="groupings_groups">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="timeadded"/>
-        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="timeadded"/>
+        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="groupid"/>
@@ -2085,10 +2085,10 @@
     </TABLE>
     <TABLE NAME="groupings_groups" COMMENT="Link a grouping to a group (note, groups can be in multiple groupings ONLY in a course). WAS: groups_groupings_groups" PREVIOUS="groups_members" NEXT="cohort">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="groupingid"/>
-        <FIELD NAME="groupingid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupingid" NEXT="timeadded"/>
-        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="groupingid"/>
+        <FIELD NAME="groupingid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupingid" NEXT="timeadded"/>
+        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="groupingid"/>
@@ -2098,15 +2098,15 @@
     </TABLE>
     <TABLE NAME="cohort" COMMENT="Each record represents one cohort (aka site-wide group)." PREVIOUS="groupings_groups" NEXT="cohort_members">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Context is usually ignored in sync operations so that the cohorts may be moved freely around in the context tree without any side affects." PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Context is usually ignored in sync operations so that the cohorts may be moved freely around in the context tree without any side affects." PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="254" NOTNULL="true" SEQUENCE="false" COMMENT="Short human readable name for the cohort, does not have to be unique" PREVIOUS="contextid" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="Unique identifier of a cohort, useful especially for mapping to external entities" PREVIOUS="name" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Standard description text box" PREVIOUS="idnumber" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="description" NEXT="component"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" SEQUENCE="false" PREVIOUS="description" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Component (plugintype_pluignname) that manages the cohort, manual modifications are allowed only when set to NULL" PREVIOUS="descriptionformat" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="component" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="component" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="context"/>
@@ -2115,10 +2115,10 @@
     </TABLE>
     <TABLE NAME="cohort_members" COMMENT="Link a user to a cohort." PREVIOUS="cohort" NEXT="user_private_key">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="cohortid"/>
-        <FIELD NAME="cohortid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cohortid" NEXT="timeadded"/>
-        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="cohortid"/>
+        <FIELD NAME="cohortid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cohortid" NEXT="timeadded"/>
+        <FIELD NAME="timeadded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="cohortid"/>
@@ -2131,14 +2131,14 @@
     </TABLE>
     <TABLE NAME="user_private_key" COMMENT="access keys used in cookieless scripts - rss, etc." PREVIOUS="cohort_members" NEXT="grade_letters">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="script"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="script"/>
         <FIELD NAME="script" TYPE="char" LENGTH="128" NOTNULL="true" SEQUENCE="false" COMMENT="plugin, module - unique identifier" PREVIOUS="id" NEXT="value"/>
         <FIELD NAME="value" TYPE="char" LENGTH="128" NOTNULL="true" SEQUENCE="false" COMMENT="private access key value" PREVIOUS="script" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="owner" PREVIOUS="value" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="optional instance id" PREVIOUS="userid" NEXT="iprestriction"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="owner" PREVIOUS="value" NEXT="instance"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="optional instance id" PREVIOUS="userid" NEXT="iprestriction"/>
         <FIELD NAME="iprestriction" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="ip restriction" PREVIOUS="instance" NEXT="validuntil"/>
-        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil"/>
+        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -2150,9 +2150,9 @@
     </TABLE>
     <TABLE NAME="grade_letters" COMMENT="Repository for grade letters, for courses and other moodle entities that use grades." PREVIOUS="user_private_key" NEXT="cache_flags">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="What contextid does this letter apply to (for now these will always be courses, but later...)" PREVIOUS="id" NEXT="lowerboundary"/>
-        <FIELD NAME="lowerboundary" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" COMMENT="The lower boundary of the letter. Its upper boundary is the lower boundary of the next highest letter, unless there is none above, in which case it's grademax for that grade_item." PREVIOUS="contextid" NEXT="letter"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="What contextid does this letter apply to (for now these will always be courses, but later...)" PREVIOUS="id" NEXT="lowerboundary"/>
+        <FIELD NAME="lowerboundary" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="The lower boundary of the letter. Its upper boundary is the lower boundary of the next highest letter, unless there is none above, in which case it's grademax for that grade_item." PREVIOUS="contextid" NEXT="letter"/>
         <FIELD NAME="letter" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The display value of the letter. Can be any character or string of characters (OK, A, 10% etc..)" PREVIOUS="lowerboundary"/>
       </FIELDS>
       <KEYS>
@@ -2164,12 +2164,12 @@
     </TABLE>
     <TABLE NAME="cache_flags" COMMENT="Cache of time-sensitive flags" PREVIOUS="grade_letters" NEXT="grade_settings">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="flagtype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="flagtype"/>
         <FIELD NAME="flagtype" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="flagtype" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="value"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="expiry"/>
-        <FIELD NAME="expiry" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="value"/>
+        <FIELD NAME="expiry" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="value"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2181,8 +2181,8 @@
     </TABLE>
     <TABLE NAME="grade_settings" COMMENT="gradebook settings" PREVIOUS="cache_flags" NEXT="webdav_locks">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="courseid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
@@ -2196,15 +2196,15 @@
     </TABLE>
     <TABLE NAME="webdav_locks" COMMENT="Resource locks for WebDAV users" PREVIOUS="grade_settings" NEXT="portfolio_instance">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="token"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="token"/>
         <FIELD NAME="token" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="token" NEXT="expiry"/>
-        <FIELD NAME="expiry" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="expiry" NEXT="recursive"/>
-        <FIELD NAME="recursive" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="exclusivelock"/>
-        <FIELD NAME="exclusivelock" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="recursive" NEXT="created"/>
-        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="exclusivelock" NEXT="modified"/>
-        <FIELD NAME="modified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="created" NEXT="owner"/>
+        <FIELD NAME="expiry" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="expiry" NEXT="recursive"/>
+        <FIELD NAME="recursive" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="exclusivelock"/>
+        <FIELD NAME="exclusivelock" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="recursive" NEXT="created"/>
+        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="exclusivelock" NEXT="modified"/>
+        <FIELD NAME="modified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="created" NEXT="owner"/>
         <FIELD NAME="owner" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="modified"/>
       </FIELDS>
       <KEYS>
@@ -2218,10 +2218,10 @@
     </TABLE>
     <TABLE NAME="portfolio_instance" COMMENT="base table (not including config data) for instances of portfolio plugins." PREVIOUS="webdav_locks" NEXT="portfolio_instance_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="plugin"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="plugin"/>
         <FIELD NAME="plugin" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" COMMENT="fk to plugin" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="name of plugin instance" PREVIOUS="plugin" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="whether this instance is visible or not" PREVIOUS="name"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="whether this instance is visible or not" PREVIOUS="name"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2229,8 +2229,8 @@
     </TABLE>
     <TABLE NAME="portfolio_instance_config" COMMENT="config for portfolio plugin instances" PREVIOUS="portfolio_instance" NEXT="portfolio_instance_user">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="instance of plugin we're configurating" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="instance"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="instance of plugin we're configurating" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="config field" PREVIOUS="instance" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="config value" PREVIOUS="name"/>
       </FIELDS>
@@ -2244,9 +2244,9 @@
     </TABLE>
     <TABLE NAME="portfolio_instance_user" COMMENT="user data for portfolio instances." PREVIOUS="portfolio_instance_config" NEXT="portfolio_log">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="fk to instance table" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="fk to user table" PREVIOUS="instance" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="instance"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="fk to instance table" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="fk to user table" PREVIOUS="instance" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="name of config item" PREVIOUS="userid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="value of config item" PREVIOUS="name"/>
       </FIELDS>
@@ -2258,14 +2258,14 @@
     </TABLE>
     <TABLE NAME="portfolio_log" COMMENT="log of portfolio transfers (used to later check for duplicates)" PREVIOUS="portfolio_instance_user" NEXT="portfolio_tempdata">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="user who exported content" PREVIOUS="id" NEXT="time"/>
-        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time of transfer (in the case of a queued transfer this is the time the actual transfer ran, not when the user started)" PREVIOUS="userid" NEXT="portfolio"/>
-        <FIELD NAME="portfolio" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="fk to portfolio_instance" PREVIOUS="time" NEXT="caller_class"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="user who exported content" PREVIOUS="id" NEXT="time"/>
+        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time of transfer (in the case of a queued transfer this is the time the actual transfer ran, not when the user started)" PREVIOUS="userid" NEXT="portfolio"/>
+        <FIELD NAME="portfolio" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="fk to portfolio_instance" PREVIOUS="time" NEXT="caller_class"/>
         <FIELD NAME="caller_class" TYPE="char" LENGTH="150" NOTNULL="true" SEQUENCE="false" COMMENT="the name of the class used to create the transfer" PREVIOUS="portfolio" NEXT="caller_file"/>
         <FIELD NAME="caller_file" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="path to file to include where the class definition lives. (relative to dirroot)" PREVIOUS="caller_class" NEXT="caller_sha1"/>
         <FIELD NAME="caller_sha1" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="sha1 of exported content as far as the caller is concerned (before the portfolio plugin gets a hold of it)" PREVIOUS="caller_file" NEXT="tempdataid"/>
-        <FIELD NAME="tempdataid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="old id from portfolio_tempdata.  This is so that we can gracefully catch a race condition between an external system requesting a file and causing the tempdata to be deleted, before the user gets the &quot;your transfer is requested&quot; page" PREVIOUS="caller_sha1" NEXT="returnurl"/>
+        <FIELD NAME="tempdataid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="old id from portfolio_tempdata.  This is so that we can gracefully catch a race condition between an external system requesting a file and causing the tempdata to be deleted, before the user gets the &quot;your transfer is requested&quot; page" PREVIOUS="caller_sha1" NEXT="returnurl"/>
         <FIELD NAME="returnurl" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="the original &quot;returnurl&quot; of the export - takes us to the moodle page we started from" PREVIOUS="tempdataid" NEXT="continueurl"/>
         <FIELD NAME="continueurl" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="the url the external system has set to view the transfer" PREVIOUS="returnurl"/>
       </FIELDS>
@@ -2277,11 +2277,11 @@
     </TABLE>
     <TABLE NAME="portfolio_tempdata" COMMENT="stores temporary data for portfolio exports. the id of this table is used for the itemid for the temporary files area.  cron can clean up stale records (and associated file data) after expirytime." PREVIOUS="portfolio_log" NEXT="message_providers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="data"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="data"/>
         <FIELD NAME="data" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="dumping ground for portfolio callers to store their data in." PREVIOUS="id" NEXT="expirytime"/>
-        <FIELD NAME="expirytime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time this record will expire (used for cron cleanups) - the start of export + 24 hours" PREVIOUS="data" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="psuedo fk to user.  this is stored in the serialised data structure in the data field, but added here for ease of lookups." PREVIOUS="expirytime" NEXT="instance"/>
-        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="which portfolio plugin instance is being used" PREVIOUS="userid"/>
+        <FIELD NAME="expirytime" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time this record will expire (used for cron cleanups) - the start of export + 24 hours" PREVIOUS="data" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="psuedo fk to user.  this is stored in the serialised data structure in the data field, but added here for ease of lookups." PREVIOUS="expirytime" NEXT="instance"/>
+        <FIELD NAME="instance" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="which portfolio plugin instance is being used" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userfk"/>
@@ -2291,7 +2291,7 @@
     </TABLE>
     <TABLE NAME="message_providers" COMMENT="This table stores the message providers (modules and core systems)" PREVIOUS="portfolio_tempdata" NEXT="message_processors">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="true" COMMENT="id of the table, please edit me" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="id of the table, please edit me" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="The full name of the message provider in standard form" PREVIOUS="id" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="200" NOTNULL="true" SEQUENCE="false" COMMENT="The name of the component that produces these messages" PREVIOUS="name" NEXT="capability"/>
         <FIELD NAME="capability" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Optional: permission that is required on the user's setting screen to see this message provider." PREVIOUS="component"/>
@@ -2305,9 +2305,9 @@
     </TABLE>
     <TABLE NAME="message_processors" COMMENT="List of message output plugins" PREVIOUS="message_providers" NEXT="message_working">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="166" NOTNULL="true" SEQUENCE="false" COMMENT="Name of the message processor" PREVIOUS="id" NEXT="enabled"/>
-        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="Defines if processor is enabled" PREVIOUS="name"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Defines if processor is enabled" PREVIOUS="name"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the table, please edit me"/>
@@ -2315,9 +2315,9 @@
     </TABLE>
     <TABLE NAME="message_working" COMMENT="Lists all the messages and processors that need to be processed" PREVIOUS="message_processors" NEXT="files">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="true" COMMENT="id of the table, please edit me" NEXT="unreadmessageid"/>
-        <FIELD NAME="unreadmessageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="message that still needs some processing (on message table)" PREVIOUS="id" NEXT="processorid"/>
-        <FIELD NAME="processorid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The processor with processes the message" PREVIOUS="unreadmessageid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="id of the table, please edit me" NEXT="unreadmessageid"/>
+        <FIELD NAME="unreadmessageid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="message that still needs some processing (on message table)" PREVIOUS="id" NEXT="processorid"/>
+        <FIELD NAME="processorid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The processor with processes the message" PREVIOUS="unreadmessageid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="primary key of the table, please edit me"/>
@@ -2325,25 +2325,25 @@
     </TABLE>
     <TABLE NAME="files" COMMENT="description of files, content is stored in sha1 file pool" PREVIOUS="message_working" NEXT="repository">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contenthash"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contenthash"/>
         <FIELD NAME="contenthash" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="sha1 hash of file content" PREVIOUS="id" NEXT="pathnamehash"/>
         <FIELD NAME="pathnamehash" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="complete file path sha1 hash - unique for each file" PREVIOUS="contenthash" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The context id defined in context table - identifies the instance of plugin owning the file" PREVIOUS="pathnamehash" NEXT="component"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The context id defined in context table - identifies the instance of plugin owning the file" PREVIOUS="pathnamehash" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Full name of the component owning the area" PREVIOUS="contextid" NEXT="filearea"/>
         <FIELD NAME="filearea" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" COMMENT="Like &quot;coursefiles&quot;. &quot;submission&quot;, &quot;intro&quot; and &quot;content&quot; (images and swf linked from summaries), etc." PREVIOUS="component" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Optional - some plugin specific item id (eg. forum post, blog entry or assignment submission, user id for user files)" PREVIOUS="filearea" NEXT="filepath"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Optional - some plugin specific item id (eg. forum post, blog entry or assignment submission, user id for user files)" PREVIOUS="filearea" NEXT="filepath"/>
         <FIELD NAME="filepath" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Optional - relative path to file from module content root, useful in Scorm and Resource mod - most of the mods do not need this" PREVIOUS="itemid" NEXT="filename"/>
         <FIELD NAME="filename" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The full Unicode name of this file (case sensitive) - some chars are not allowed though" PREVIOUS="filepath" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Optional - general userid field - meaning depending on plugin" PREVIOUS="filename" NEXT="filesize"/>
-        <FIELD NAME="filesize" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="mimetype"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Optional - general userid field - meaning depending on plugin" PREVIOUS="filename" NEXT="filesize"/>
+        <FIELD NAME="filesize" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="mimetype"/>
         <FIELD NAME="mimetype" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="type of file - jpeg image, open document spreadsheet" PREVIOUS="filesize" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="number greater than 0 means something is wrong with this file (virus, missing, etc.)" PREVIOUS="mimetype" NEXT="source"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="number greater than 0 means something is wrong with this file (virus, missing, etc.)" PREVIOUS="mimetype" NEXT="source"/>
         <FIELD NAME="source" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="contains the reference if the file is imported from external sites" PREVIOUS="status" NEXT="author"/>
         <FIELD NAME="author" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="The original author of the file" PREVIOUS="source" NEXT="license"/>
         <FIELD NAME="license" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="license of the file to guide reuse" PREVIOUS="author" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="license" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="order of files" PREVIOUS="timemodified"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="license" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="order of files" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="contextid"/>
@@ -2358,10 +2358,10 @@
     </TABLE>
     <TABLE NAME="repository" COMMENT="This table contains one entry for every configured external repository instance." PREVIOUS="files" NEXT="repository_instances">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="type"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="type" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="type" NEXT="sortorder"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visible"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2369,16 +2369,16 @@
     </TABLE>
     <TABLE NAME="repository_instances" COMMENT="This table contains one entry for every configured external repository instance." PREVIOUS="repository" NEXT="repository_instance_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="typeid"/>
-        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="name" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="typeid" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="username"/>
+        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="typeid" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="username"/>
         <FIELD NAME="username" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="contextid" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="username" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="password" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="readonly"/>
-        <FIELD NAME="readonly" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="password" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="timecreated" NEXT="readonly"/>
+        <FIELD NAME="readonly" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2386,8 +2386,8 @@
     </TABLE>
     <TABLE NAME="repository_instance_config" COMMENT="The config for intances" PREVIOUS="repository_instances" NEXT="backup_files">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="instanceid"/>
-        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="instanceid"/>
+        <FIELD NAME="instanceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="instanceid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
@@ -2397,12 +2397,12 @@
     </TABLE>
     <TABLE NAME="backup_files" COMMENT="To store and recode ids to user and course files" PREVIOUS="repository_instance_config" NEXT="backup_ids">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backup_code"/>
-        <FIELD NAME="backup_code" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="file_type"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backup_code"/>
+        <FIELD NAME="backup_code" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="file_type"/>
         <FIELD NAME="file_type" TYPE="char" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="backup_code" NEXT="path"/>
         <FIELD NAME="path" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="file_type" NEXT="old_id"/>
-        <FIELD NAME="old_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path" NEXT="new_id"/>
-        <FIELD NAME="new_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="old_id"/>
+        <FIELD NAME="old_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="path" NEXT="new_id"/>
+        <FIELD NAME="new_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="old_id"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="backup_code-file_type-path"/>
@@ -2411,11 +2411,11 @@
     </TABLE>
     <TABLE NAME="backup_ids" COMMENT="To store and convert ids in backup/restore" PREVIOUS="backup_files" NEXT="backup_courses">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backup_code"/>
-        <FIELD NAME="backup_code" TYPE="int" LENGTH="12" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="table_name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backup_code"/>
+        <FIELD NAME="backup_code" TYPE="int" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="table_name"/>
         <FIELD NAME="table_name" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="backup_code" NEXT="old_id"/>
-        <FIELD NAME="old_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="table_name" NEXT="new_id"/>
-        <FIELD NAME="new_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="old_id" NEXT="info"/>
+        <FIELD NAME="old_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="table_name" NEXT="new_id"/>
+        <FIELD NAME="new_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="old_id" NEXT="info"/>
         <FIELD NAME="info" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="new_id"/>
       </FIELDS>
       <KEYS>
@@ -2425,12 +2425,12 @@
     </TABLE>
     <TABLE NAME="backup_courses" COMMENT="To store every course backup status" PREVIOUS="backup_ids" NEXT="block">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="laststarttime"/>
-        <FIELD NAME="laststarttime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="lastendtime"/>
-        <FIELD NAME="lastendtime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="laststarttime" NEXT="laststatus"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="laststarttime"/>
+        <FIELD NAME="laststarttime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="courseid" NEXT="lastendtime"/>
+        <FIELD NAME="lastendtime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="laststarttime" NEXT="laststatus"/>
         <FIELD NAME="laststatus" TYPE="char" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastendtime" NEXT="nextstarttime"/>
-        <FIELD NAME="nextstarttime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="laststatus"/>
+        <FIELD NAME="nextstarttime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="laststatus"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="courseid"/>
@@ -2439,12 +2439,12 @@
     </TABLE>
     <TABLE NAME="block" COMMENT="contains all installed blocks" PREVIOUS="backup_courses" NEXT="block_instances">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="version"/>
-        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="cron"/>
-        <FIELD NAME="cron" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="lastcron"/>
-        <FIELD NAME="lastcron" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cron" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="lastcron"/>
+        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="cron"/>
+        <FIELD NAME="cron" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="lastcron"/>
+        <FIELD NAME="lastcron" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="cron" NEXT="visible"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="lastcron"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2455,14 +2455,14 @@
     </TABLE>
     <TABLE NAME="block_instances" COMMENT="This table stores block instances. The type of block this is is given by the blockname column. The places this block instance appears is controlled by the parentcontexid, showinsubcontexts, pagetypepattern and subpagepattern fields. Where the block appears on the page (by default) is controlled by the defaultposition and defaultweight columns. The block's own configuration is stored serialized in configdata." PREVIOUS="block" NEXT="block_positions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="blockname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="blockname"/>
         <FIELD NAME="blockname" TYPE="char" LENGTH="40" NOTNULL="true" SEQUENCE="false" COMMENT="The type of block this is. Foreign key, references block.name." PREVIOUS="id" NEXT="parentcontextid"/>
-        <FIELD NAME="parentcontextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The context within which this block appears. Foreign key, references context.id." PREVIOUS="blockname" NEXT="showinsubcontexts"/>
-        <FIELD NAME="showinsubcontexts" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="If 1, this block appears on all matching pages in subcontexts of parentcontextid, as well in pages belonging to parentcontextid." PREVIOUS="parentcontextid" NEXT="pagetypepattern"/>
+        <FIELD NAME="parentcontextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The context within which this block appears. Foreign key, references context.id." PREVIOUS="blockname" NEXT="showinsubcontexts"/>
+        <FIELD NAME="showinsubcontexts" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="If 1, this block appears on all matching pages in subcontexts of parentcontextid, as well in pages belonging to parentcontextid." PREVIOUS="parentcontextid" NEXT="pagetypepattern"/>
         <FIELD NAME="pagetypepattern" TYPE="char" LENGTH="64" NOTNULL="true" SEQUENCE="false" COMMENT="The types of page this block appears on. Either an exact page type like mod-quiz-view, or a pattern like mod-quiz-* or course-view-*. Note that course-view-* will match course-view." PREVIOUS="showinsubcontexts" NEXT="subpagepattern"/>
         <FIELD NAME="subpagepattern" TYPE="char" LENGTH="16" NOTNULL="false" SEQUENCE="false" COMMENT="Further restrictions on where this block appears. In some places, e.g. during a quiz or lesson attempt, different pages have different subpage ids. If this field is not null, the block only appears on that particular subpage." PREVIOUS="pagetypepattern" NEXT="defaultregion"/>
         <FIELD NAME="defaultregion" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false" COMMENT="Which block region this block should appear in on each page, in the absence of a specific position in the block_positions table." PREVIOUS="subpagepattern" NEXT="defaultweight"/>
-        <FIELD NAME="defaultweight" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="Used to order the blocks within a block region. Again, may be overridden by the block_positions table for a specific page where this block appears." PREVIOUS="defaultregion" NEXT="configdata"/>
+        <FIELD NAME="defaultweight" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Used to order the blocks within a block region. Again, may be overridden by the block_positions table for a specific page where this block appears." PREVIOUS="defaultregion" NEXT="configdata"/>
         <FIELD NAME="configdata" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="A serialized blob of configuration data for this block instance." PREVIOUS="defaultweight"/>
       </FIELDS>
       <KEYS>
@@ -2475,14 +2475,14 @@
     </TABLE>
     <TABLE NAME="block_positions" COMMENT="Stores the position of a sticky block_instance on a another page than the one where it was added." PREVIOUS="block_instances" NEXT="comments">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="blockinstanceid"/>
-        <FIELD NAME="blockinstanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The block_instance this position relates to." PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="With pagetype and subpage, defines the page we are setting the position for." PREVIOUS="blockinstanceid" NEXT="pagetype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="blockinstanceid"/>
+        <FIELD NAME="blockinstanceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The block_instance this position relates to." PREVIOUS="id" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="With pagetype and subpage, defines the page we are setting the position for." PREVIOUS="blockinstanceid" NEXT="pagetype"/>
         <FIELD NAME="pagetype" TYPE="char" LENGTH="64" NOTNULL="true" SEQUENCE="false" COMMENT="With contextid and subpage, defines the page we are setting the position for." PREVIOUS="contextid" NEXT="subpage"/>
         <FIELD NAME="subpage" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false" COMMENT="With contextid and pagetype, defines the page we are setting the position for." PREVIOUS="pagetype" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="Whether this block instance is visible on this page." PREVIOUS="subpage" NEXT="region"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="Whether this block instance is visible on this page." PREVIOUS="subpage" NEXT="region"/>
         <FIELD NAME="region" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false" COMMENT="Which block region on this page this block should appear in." PREVIOUS="visible" NEXT="weight"/>
-        <FIELD NAME="weight" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="Used to order the blocks within a block region." PREVIOUS="region"/>
+        <FIELD NAME="weight" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Used to order the blocks within a block region." PREVIOUS="region"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="blockinstanceid"/>
@@ -2495,14 +2495,14 @@
     </TABLE>
     <TABLE NAME="comments" COMMENT="moodle comments module" PREVIOUS="block_positions" NEXT="external_services">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="commentarea"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="commentarea"/>
         <FIELD NAME="commentarea" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="commentarea" NEXT="content"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="commentarea" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="itemid" NEXT="format"/>
-        <FIELD NAME="format" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="content" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="format" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="format" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="content" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="format" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2510,16 +2510,16 @@
     </TABLE>
     <TABLE NAME="external_services" COMMENT="built in and custom external services" PREVIOUS="comments" NEXT="external_functions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="200" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="enabled"/>
-        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="name" NEXT="requiredcapability"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="requiredcapability"/>
         <FIELD NAME="requiredcapability" TYPE="char" LENGTH="150" NOTNULL="false" SEQUENCE="false" PREVIOUS="enabled" NEXT="restrictedusers"/>
-        <FIELD NAME="restrictedusers" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="requiredcapability" NEXT="component"/>
+        <FIELD NAME="restrictedusers" TYPE="int" LENGTH="1" NOTNULL="true" SEQUENCE="false" PREVIOUS="requiredcapability" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="restrictedusers" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="component" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated" NEXT="shortname"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="component" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="timecreated" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="a unique shortname" PREVIOUS="timemodified" NEXT="downloadfiles"/>
-        <FIELD NAME="downloadfiles" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 if the service allow people to download file from webservice/plugins.php - 0 if not" PREVIOUS="shortname"/>
+        <FIELD NAME="downloadfiles" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="1 if the service allow people to download file from webservice/plugins.php - 0 if not" PREVIOUS="shortname"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2530,7 +2530,7 @@
     </TABLE>
     <TABLE NAME="external_functions" COMMENT="list of all external functions" PREVIOUS="external_services" NEXT="external_services_functions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="200" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="classname"/>
         <FIELD NAME="classname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="methodname"/>
         <FIELD NAME="methodname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="classname" NEXT="classpath"/>
@@ -2547,8 +2547,8 @@
     </TABLE>
     <TABLE NAME="external_services_functions" COMMENT="lists functions available in each service group" PREVIOUS="external_functions" NEXT="external_services_users">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="externalserviceid"/>
-        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="functionname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="externalserviceid"/>
+        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="functionname"/>
         <FIELD NAME="functionname" TYPE="char" LENGTH="200" NOTNULL="true" SEQUENCE="false" PREVIOUS="externalserviceid"/>
       </FIELDS>
       <KEYS>
@@ -2558,12 +2558,12 @@
     </TABLE>
     <TABLE NAME="external_services_users" COMMENT="users allowed to use services with restricted users flag" PREVIOUS="external_services_functions" NEXT="external_tokens">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="externalserviceid"/>
-        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="externalserviceid" NEXT="iprestriction"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="externalserviceid"/>
+        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="externalserviceid" NEXT="iprestriction"/>
         <FIELD NAME="iprestriction" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="ip restriction" PREVIOUS="userid" NEXT="validuntil"/>
-        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil"/>
+        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="externalserviceid"/>
@@ -2573,18 +2573,18 @@
     </TABLE>
     <TABLE NAME="external_tokens" COMMENT="Security tokens for accessing of external services" PREVIOUS="external_services_users" NEXT="blog_association">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="token"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="token"/>
         <FIELD NAME="token" TYPE="char" LENGTH="128" NOTNULL="true" SEQUENCE="false" COMMENT="security token, aka private access key" PREVIOUS="id" NEXT="tokentype"/>
-        <FIELD NAME="tokentype" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="type of token: 0=permanent, no session; 1=linked to current browser session via sid; 2=permanent, with emulated session" PREVIOUS="token" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="owner of the token" PREVIOUS="tokentype" NEXT="externalserviceid"/>
-        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="sid"/>
+        <FIELD NAME="tokentype" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="type of token: 0=permanent, no session; 1=linked to current browser session via sid; 2=permanent, with emulated session" PREVIOUS="token" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="owner of the token" PREVIOUS="tokentype" NEXT="externalserviceid"/>
+        <FIELD NAME="externalserviceid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="sid"/>
         <FIELD NAME="sid" TYPE="char" LENGTH="128" NOTNULL="false" SEQUENCE="false" COMMENT="link to browser or emulated session" PREVIOUS="externalserviceid" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="context id where in token valid" PREVIOUS="sid" NEXT="creatorid"/>
-        <FIELD NAME="creatorid" TYPE="int" LENGTH="20" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="user id of the token creator (useful to know when the administrator created a token and so display the token to a specific administrator)" PREVIOUS="contextid" NEXT="iprestriction"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="context id where in token valid" PREVIOUS="sid" NEXT="creatorid"/>
+        <FIELD NAME="creatorid" TYPE="int" LENGTH="20" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="user id of the token creator (useful to know when the administrator created a token and so display the token to a specific administrator)" PREVIOUS="contextid" NEXT="iprestriction"/>
         <FIELD NAME="iprestriction" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="ip restriction" PREVIOUS="creatorid" NEXT="validuntil"/>
-        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil" NEXT="lastaccess"/>
-        <FIELD NAME="lastaccess" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="last access timestamp" PREVIOUS="timecreated"/>
+        <FIELD NAME="validuntil" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="timestampt - valid until data" PREVIOUS="iprestriction" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="created timestamp" PREVIOUS="validuntil" NEXT="lastaccess"/>
+        <FIELD NAME="lastaccess" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="last access timestamp" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -2596,9 +2596,9 @@
     </TABLE>
     <TABLE NAME="blog_association" COMMENT="Associations of blog entries with courses and module instances" PREVIOUS="external_tokens" NEXT="blog_external">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="blogid"/>
-        <FIELD NAME="blogid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="contextid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="blogid"/>
+        <FIELD NAME="blogid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="contextid"/>
@@ -2608,15 +2608,15 @@
     </TABLE>
     <TABLE NAME="blog_external" COMMENT="External blog links used for RSS copying of blog entries to Moodle user blogs" PREVIOUS="blog_association" NEXT="rating">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="url"/>
         <FIELD NAME="url" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="description" NEXT="filtertags"/>
         <FIELD NAME="filtertags" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Comma-separated list of tags that will be used to filter which entries are copied over from the external blog. They refer to existing tags in the external blog." PREVIOUS="url" NEXT="failedlastsync"/>
-        <FIELD NAME="failedlastsync" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether or not the last sync failed for some reason" PREVIOUS="filtertags" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="failedlastsync" NEXT="timefetched"/>
-        <FIELD NAME="timefetched" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
+        <FIELD NAME="failedlastsync" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether or not the last sync failed for some reason" PREVIOUS="filtertags" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="failedlastsync" NEXT="timefetched"/>
+        <FIELD NAME="timefetched" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="userid"/>
@@ -2625,16 +2625,16 @@
     </TABLE>
     <TABLE NAME="rating" COMMENT="moodle ratings" PREVIOUS="blog_external" NEXT="license">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="component"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid" NEXT="ratingarea"/>
         <FIELD NAME="ratingarea" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="component" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="ratingarea" NEXT="scaleid"/>
-        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" PREVIOUS="itemid" NEXT="rating"/>
-        <FIELD NAME="rating" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="scaleid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="rating" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="ratingarea" NEXT="scaleid"/>
+        <FIELD NAME="scaleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="itemid" NEXT="rating"/>
+        <FIELD NAME="rating" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="scaleid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="rating" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="contextid"/>
@@ -2647,12 +2647,12 @@
     </TABLE>
     <TABLE NAME="license" COMMENT="store licenses used by moodle" PREVIOUS="rating" NEXT="registration_hubs">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="shortname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="id" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="shortname" NEXT="source"/>
         <FIELD NAME="source" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="fullname" NEXT="enabled"/>
-        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="source" NEXT="version"/>
-        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="enabled"/>
+        <FIELD NAME="enabled" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="source" NEXT="version"/>
+        <FIELD NAME="version" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="enabled"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2660,11 +2660,11 @@
     </TABLE>
     <TABLE NAME="registration_hubs" COMMENT="hub where the site is registered on with their associated token" PREVIOUS="license" NEXT="backup_controllers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="token"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="token"/>
         <FIELD NAME="token" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="the token to communicate with the hub by web service" PREVIOUS="id" NEXT="hubname"/>
         <FIELD NAME="hubname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="token" NEXT="huburl"/>
         <FIELD NAME="huburl" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="hubname" NEXT="confirmed"/>
-        <FIELD NAME="confirmed" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="huburl" NEXT="secret"/>
+        <FIELD NAME="confirmed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="huburl" NEXT="secret"/>
         <FIELD NAME="secret" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="the unique site identifier for this hub" PREVIOUS="confirmed"/>
       </FIELDS>
       <KEYS>
@@ -2673,21 +2673,21 @@
     </TABLE>
     <TABLE NAME="backup_controllers" COMMENT="To store the backup_controllers as they are used" PREVIOUS="registration_hubs" NEXT="backup_ids_template">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backupid"/>
         <FIELD NAME="backupid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="unique id of the backup" PREVIOUS="id" NEXT="operation"/>
         <FIELD NAME="operation" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="backup" SEQUENCE="false" COMMENT="Type of operation (backup/restore)" PREVIOUS="backupid" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Type of the backup (activity/section/course)" PREVIOUS="operation" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the module/section/activity being backup" PREVIOUS="type" NEXT="format"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="id of the module/section/activity being backup" PREVIOUS="type" NEXT="format"/>
         <FIELD NAME="format" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" COMMENT="format of the backup (moodle/imscc...)" PREVIOUS="itemid" NEXT="interactive"/>
-        <FIELD NAME="interactive" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="is the backup interactive (1-yes/0-no)" PREVIOUS="format" NEXT="purpose"/>
-        <FIELD NAME="purpose" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="purpose (target) of the backup (general, import, hub...)" PREVIOUS="interactive" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="user that owns/performs the backup" PREVIOUS="purpose" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="current status of the backup (configured, ui, running...)" PREVIOUS="userid" NEXT="execution"/>
-        <FIELD NAME="execution" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="type of execution (immediate/delayed)" PREVIOUS="status" NEXT="executiontime"/>
-        <FIELD NAME="executiontime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="epoch secs when the backup should be executed (for delayed backups only)" PREVIOUS="execution" NEXT="checksum"/>
+        <FIELD NAME="interactive" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="is the backup interactive (1-yes/0-no)" PREVIOUS="format" NEXT="purpose"/>
+        <FIELD NAME="purpose" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="purpose (target) of the backup (general, import, hub...)" PREVIOUS="interactive" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="user that owns/performs the backup" PREVIOUS="purpose" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="current status of the backup (configured, ui, running...)" PREVIOUS="userid" NEXT="execution"/>
+        <FIELD NAME="execution" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="type of execution (immediate/delayed)" PREVIOUS="status" NEXT="executiontime"/>
+        <FIELD NAME="executiontime" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="epoch secs when the backup should be executed (for delayed backups only)" PREVIOUS="execution" NEXT="checksum"/>
         <FIELD NAME="checksum" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="checksum of the backup_controller object" PREVIOUS="executiontime" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time the controller was created" PREVIOUS="checksum" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="last time the controller was modified" PREVIOUS="timecreated" NEXT="controller"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time the controller was created" PREVIOUS="checksum" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="last time the controller was modified" PREVIOUS="timecreated" NEXT="controller"/>
         <FIELD NAME="controller" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="serialised backup_controller object" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
@@ -2701,12 +2701,12 @@
     </TABLE>
     <TABLE NAME="backup_ids_template" COMMENT="To store all sort of ids along the backup process. Note this table isn't really used but its temporary counterpart." PREVIOUS="backup_controllers" NEXT="backup_files_template">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backupid"/>
         <FIELD NAME="backupid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="unique id of the backup" PREVIOUS="id" NEXT="itemname"/>
         <FIELD NAME="itemname" TYPE="char" LENGTH="160" NOTNULL="true" SEQUENCE="false" COMMENT="name of the component this id belongs to (usually table names)" PREVIOUS="backupid" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="id of the component (usually table-&amp;gt;id values)" PREVIOUS="itemname" NEXT="newitemid"/>
-        <FIELD NAME="newitemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="new id of the component after restore" PREVIOUS="itemid" NEXT="parentitemid"/>
-        <FIELD NAME="parentitemid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="other id that can be useful to represent parent-child relations" PREVIOUS="newitemid" NEXT="info"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="id of the component (usually table-&amp;gt;id values)" PREVIOUS="itemname" NEXT="newitemid"/>
+        <FIELD NAME="newitemid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="new id of the component after restore" PREVIOUS="itemid" NEXT="parentitemid"/>
+        <FIELD NAME="parentitemid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="other id that can be useful to represent parent-child relations" PREVIOUS="newitemid" NEXT="info"/>
         <FIELD NAME="info" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="to store information related with the item, base64(serialize())" PREVIOUS="parentitemid"/>
       </FIELDS>
       <KEYS>
@@ -2720,12 +2720,12 @@
     </TABLE>
     <TABLE NAME="backup_files_template" COMMENT="To store files along the backup process. Note this table isn't really used but its temporary counterpart." PREVIOUS="backup_ids_template" NEXT="backup_logs">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backupid"/>
         <FIELD NAME="backupid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="unique backup id this record corresponds to" PREVIOUS="id" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="source contextid of the file" PREVIOUS="backupid" NEXT="component"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="source contextid of the file" PREVIOUS="backupid" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="contextid" NEXT="filearea"/>
         <FIELD NAME="filearea" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="component" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="filearea" NEXT="info"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="filearea" NEXT="info"/>
         <FIELD NAME="info" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="to store the complete file record (serialized)" PREVIOUS="itemid"/>
       </FIELDS>
       <KEYS>
@@ -2737,11 +2737,11 @@
     </TABLE>
     <TABLE NAME="backup_logs" COMMENT="To store all the logs from backup and restore operations (by db logger)" PREVIOUS="backup_files_template" NEXT="profiling">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="backupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="backupid"/>
         <FIELD NAME="backupid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="backupid the log record belongs to" PREVIOUS="id" NEXT="loglevel"/>
-        <FIELD NAME="loglevel" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="level of the log (debug...error)" PREVIOUS="backupid" NEXT="message"/>
+        <FIELD NAME="loglevel" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="level of the log (debug...error)" PREVIOUS="backupid" NEXT="message"/>
         <FIELD NAME="message" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="text logged" PREVIOUS="loglevel" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="timestamp this log entry was created" PREVIOUS="message"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="timestamp this log entry was created" PREVIOUS="message"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="backupid"/>
@@ -2753,17 +2753,17 @@
     </TABLE>
     <TABLE NAME="profiling" COMMENT="Stores the results of all the profiling runs" PREVIOUS="backup_logs" NEXT="course_published">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="runid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="runid"/>
         <FIELD NAME="runid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="the unique id for this run (as generated by xhprof)" PREVIOUS="id" NEXT="url"/>
         <FIELD NAME="url" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="the url this profiling record is about (without wwwroot nor query params)" PREVIOUS="runid" NEXT="data"/>
         <FIELD NAME="data" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" COMMENT="the raw data gathered by xhprof" PREVIOUS="url" NEXT="totalexecutiontime"/>
-        <FIELD NAME="totalexecutiontime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time (in microseconds) spent by the run" PREVIOUS="data" NEXT="totalcputime"/>
-        <FIELD NAME="totalcputime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="time (in microseconds) spent by the CPU in this run" PREVIOUS="totalexecutiontime" NEXT="totalcalls"/>
-        <FIELD NAME="totalcalls" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Total number of calls performed by the run" PREVIOUS="totalcputime" NEXT="totalmemory"/>
-        <FIELD NAME="totalmemory" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Total memory used byt the run" PREVIOUS="totalcalls" NEXT="runreference"/>
-        <FIELD NAME="runreference" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is this run a reference one" PREVIOUS="totalmemory" NEXT="runcomment"/>
+        <FIELD NAME="totalexecutiontime" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time (in microseconds) spent by the run" PREVIOUS="data" NEXT="totalcputime"/>
+        <FIELD NAME="totalcputime" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="time (in microseconds) spent by the CPU in this run" PREVIOUS="totalexecutiontime" NEXT="totalcalls"/>
+        <FIELD NAME="totalcalls" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Total number of calls performed by the run" PREVIOUS="totalcputime" NEXT="totalmemory"/>
+        <FIELD NAME="totalmemory" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Total memory used byt the run" PREVIOUS="totalcalls" NEXT="runreference"/>
+        <FIELD NAME="runreference" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is this run a reference one" PREVIOUS="totalmemory" NEXT="runcomment"/>
         <FIELD NAME="runcomment" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Brief comment for this run" PREVIOUS="runreference" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="unix timestap of the creation of this run" PREVIOUS="runcomment"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="unix timestap of the creation of this run" PREVIOUS="runcomment"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="runid_uk"/>
@@ -2776,14 +2776,14 @@
     </TABLE>
     <TABLE NAME="course_published" COMMENT="Information about how and when an local courses were published to hubs" PREVIOUS="profiling" NEXT="grading_areas">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="huburl"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="huburl"/>
         <FIELD NAME="huburl" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="the url of the &quot;registered on&quot; hub" PREVIOUS="id" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="the id of the published course" PREVIOUS="huburl" NEXT="timepublished"/>
-        <FIELD NAME="timepublished" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The time when the publication occurred" PREVIOUS="courseid" NEXT="enrollable"/>
-        <FIELD NAME="enrollable" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="1 = enrollable, 0 = downloadable" PREVIOUS="timepublished" NEXT="hubcourseid"/>
-        <FIELD NAME="hubcourseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="the course id on the hub server" PREVIOUS="enrollable" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="is the publication published or not" PREVIOUS="hubcourseid" NEXT="timechecked"/>
-        <FIELD NAME="timechecked" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="the last time the status has been checked" PREVIOUS="status"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="the id of the published course" PREVIOUS="huburl" NEXT="timepublished"/>
+        <FIELD NAME="timepublished" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The time when the publication occurred" PREVIOUS="courseid" NEXT="enrollable"/>
+        <FIELD NAME="enrollable" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="1 = enrollable, 0 = downloadable" PREVIOUS="timepublished" NEXT="hubcourseid"/>
+        <FIELD NAME="hubcourseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="the course id on the hub server" PREVIOUS="enrollable" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="is the publication published or not" PREVIOUS="hubcourseid" NEXT="timechecked"/>
+        <FIELD NAME="timechecked" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="the last time the status has been checked" PREVIOUS="status"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -2791,8 +2791,8 @@
     </TABLE>
     <TABLE NAME="grading_areas" COMMENT="Identifies gradable areas where advanced grading can happen. For each area, the current active plugin can be set." PREVIOUS="course_published" NEXT="grading_definitions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="contextid"/>
-        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The context of the gradable area, eg module instance context." PREVIOUS="id" NEXT="component"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="contextid"/>
+        <FIELD NAME="contextid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The context of the gradable area, eg module instance context." PREVIOUS="id" NEXT="component"/>
         <FIELD NAME="component" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Frankenstyle name of the component holding this area" PREVIOUS="contextid" NEXT="areaname"/>
         <FIELD NAME="areaname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="The name of gradable area" PREVIOUS="component" NEXT="activemethod"/>
         <FIELD NAME="activemethod" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="The default grading method (plugin) that should be used for this area" PREVIOUS="areaname"/>
@@ -2805,19 +2805,19 @@
     </TABLE>
     <TABLE NAME="grading_definitions" COMMENT="Contains the basic information about an advanced grading form defined in the given gradable area" PREVIOUS="grading_areas" NEXT="grading_instances">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="areaid"/>
-        <FIELD NAME="areaid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="method"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="areaid"/>
+        <FIELD NAME="areaid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="method"/>
         <FIELD NAME="method" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="The name of the plugin providing this grading form" PREVIOUS="areaid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The title of the form that helps users to identify it" PREVIOUS="method" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="More detailed description of the form" PREVIOUS="name" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Format of the description field" PREVIOUS="description" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Status of the form definition, by default in the under-construction state" PREVIOUS="descriptionformat" NEXT="copiedfromid"/>
-        <FIELD NAME="copiedfromid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the original definition that this was initially copied from or null if it was from scratch" PREVIOUS="status" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp of when the form definition was created initially" PREVIOUS="copiedfromid" NEXT="usercreated"/>
-        <FIELD NAME="usercreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the user who created this definition and is considered as its owner for access control purposes" PREVIOUS="timecreated" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The time stamp of when the form definition was modified recently" PREVIOUS="usercreated" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the user who did the most recent modification" PREVIOUS="timemodified" NEXT="timecopied"/>
-        <FIELD NAME="timecopied" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The timestamp of when this form was most recently copied into another area" PREVIOUS="usermodified" NEXT="options"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="false" SEQUENCE="false" COMMENT="Format of the description field" PREVIOUS="description" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Status of the form definition, by default in the under-construction state" PREVIOUS="descriptionformat" NEXT="copiedfromid"/>
+        <FIELD NAME="copiedfromid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The id of the original definition that this was initially copied from or null if it was from scratch" PREVIOUS="status" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The timestamp of when the form definition was created initially" PREVIOUS="copiedfromid" NEXT="usercreated"/>
+        <FIELD NAME="usercreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the user who created this definition and is considered as its owner for access control purposes" PREVIOUS="timecreated" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The time stamp of when the form definition was modified recently" PREVIOUS="usercreated" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the user who did the most recent modification" PREVIOUS="timemodified" NEXT="timecopied"/>
+        <FIELD NAME="timecopied" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The timestamp of when this form was most recently copied into another area" PREVIOUS="usermodified" NEXT="options"/>
         <FIELD NAME="options" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="General field to be used by plugins as a general storage place for their own settings" PREVIOUS="timecopied"/>
       </FIELDS>
       <KEYS>
@@ -2830,15 +2830,15 @@
     </TABLE>
     <TABLE NAME="grading_instances" COMMENT="Grading form instance is an assessment record for one gradable item assessed by one rater" PREVIOUS="grading_definitions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="definitionid"/>
-        <FIELD NAME="definitionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the form definition this is instance of" PREVIOUS="id" NEXT="raterid"/>
-        <FIELD NAME="raterid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the user who did the assessment" PREVIOUS="definitionid" NEXT="itemid"/>
-        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="This identifies the graded item within the grabable area" PREVIOUS="raterid" NEXT="rawgrade"/>
-        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="The raw normalized grade 0.00000 - 100.00000 as a result of the most recent assessment" PREVIOUS="itemid" NEXT="status"/>
-        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The status of the assessment. By default the instance is under-assessment state" PREVIOUS="rawgrade" NEXT="feedback"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="definitionid"/>
+        <FIELD NAME="definitionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the form definition this is instance of" PREVIOUS="id" NEXT="raterid"/>
+        <FIELD NAME="raterid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the user who did the assessment" PREVIOUS="definitionid" NEXT="itemid"/>
+        <FIELD NAME="itemid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="This identifies the graded item within the grabable area" PREVIOUS="raterid" NEXT="rawgrade"/>
+        <FIELD NAME="rawgrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The raw normalized grade 0.00000 - 100.00000 as a result of the most recent assessment" PREVIOUS="itemid" NEXT="status"/>
+        <FIELD NAME="status" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The status of the assessment. By default the instance is under-assessment state" PREVIOUS="rawgrade" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Overall feedback from the rater for the author of the graded item" PREVIOUS="status" NEXT="feedbackformat"/>
-        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The format of the feedback field" PREVIOUS="feedback" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp of when the assessment was most recently modified" PREVIOUS="feedbackformat"/>
+        <FIELD NAME="feedbackformat" TYPE="int" LENGTH="2" NOTNULL="false" SEQUENCE="false" COMMENT="The format of the feedback field" PREVIOUS="feedback" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The timestamp of when the assessment was most recently modified" PREVIOUS="feedbackformat"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fk_definitionid"/>
diff --git a/mnet/service/enrol/db/install.xml b/mnet/service/enrol/db/install.xml
index d32a01c49a667..adee77b8e535e 100644
--- a/mnet/service/enrol/db/install.xml
+++ b/mnet/service/enrol/db/install.xml
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mnet/service/enrol/db" VERSION="20100716" COMMENT="XMLDB file for MNet service plugin mnet/service/enrol"
+<XMLDB PATH="mnet/service/enrol/db" VERSION="20120122" COMMENT="XMLDB file for MNet service plugin mnet/service/enrol"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="mnetservice_enrol_courses" COMMENT="Caches the information fetched via XML-RPC about courses on remote hosts that are offered for our users" NEXT="mnetservice_enrol_enrolments">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Unique remote-course ID" NEXT="hostid"/>
-        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the remote MNet host" PREVIOUS="id" NEXT="remoteid"/>
-        <FIELD NAME="remoteid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of course on its home server" PREVIOUS="hostid" NEXT="categoryid"/>
-        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the category on the remote server" PREVIOUS="remoteid" NEXT="categoryname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Unique remote-course ID" NEXT="hostid"/>
+        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the remote MNet host" PREVIOUS="id" NEXT="remoteid"/>
+        <FIELD NAME="remoteid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of course on its home server" PREVIOUS="hostid" NEXT="categoryid"/>
+        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the category on the remote server" PREVIOUS="remoteid" NEXT="categoryname"/>
         <FIELD NAME="categoryname" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="categoryid" NEXT="sortorder"/>
-        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="categoryname" NEXT="fullname"/>
+        <FIELD NAME="sortorder" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="categoryname" NEXT="fullname"/>
         <FIELD NAME="fullname" TYPE="char" LENGTH="254" NOTNULL="true" SEQUENCE="false" PREVIOUS="sortorder" NEXT="shortname"/>
         <FIELD NAME="shortname" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="fullname" NEXT="idnumber"/>
         <FIELD NAME="idnumber" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="shortname" NEXT="summary"/>
         <FIELD NAME="summary" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="idnumber" NEXT="summaryformat"/>
-        <FIELD NAME="summaryformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the summary field" PREVIOUS="summary" NEXT="startdate"/>
-        <FIELD NAME="startdate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="summaryformat" NEXT="roleid"/>
-        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The ID of the role at the remote server that our users will get when we enrol them there" PREVIOUS="startdate" NEXT="rolename"/>
+        <FIELD NAME="summaryformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the summary field" PREVIOUS="summary" NEXT="startdate"/>
+        <FIELD NAME="startdate" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="summaryformat" NEXT="roleid"/>
+        <FIELD NAME="roleid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The ID of the role at the remote server that our users will get when we enrol them there" PREVIOUS="startdate" NEXT="rolename"/>
         <FIELD NAME="rolename" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The name of the role at the remote server that our users will get when we enrol them there" PREVIOUS="roleid"/>
       </FIELDS>
       <KEYS>
@@ -30,12 +30,12 @@
     </TABLE>
     <TABLE NAME="mnetservice_enrol_enrolments" COMMENT="Caches the information about enrolments of our local users in courses on remote hosts" PREVIOUS="mnetservice_enrol_courses">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="Unique enrollment ID" NEXT="hostid"/>
-        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of the remote MNet host" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of our local user on this server" PREVIOUS="hostid" NEXT="remotecourseid"/>
-        <FIELD NAME="remotecourseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of the course at  the remote server. Note that this may and may not be cached in our mnetservice_enrol_courses table, depends of whether the course is opened for remote enrolments or our student is the enrolled there via other plugin" PREVIOUS="userid" NEXT="rolename"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="Unique enrollment ID" NEXT="hostid"/>
+        <FIELD NAME="hostid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of the remote MNet host" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of our local user on this server" PREVIOUS="hostid" NEXT="remotecourseid"/>
+        <FIELD NAME="remotecourseid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of the course at  the remote server. Note that this may and may not be cached in our mnetservice_enrol_courses table, depends of whether the course is opened for remote enrolments or our student is the enrolled there via other plugin" PREVIOUS="userid" NEXT="rolename"/>
         <FIELD NAME="rolename" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="remotecourseid" NEXT="enroltime"/>
-        <FIELD NAME="enroltime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rolename" NEXT="enroltype"/>
+        <FIELD NAME="enroltime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rolename" NEXT="enroltype"/>
         <FIELD NAME="enroltype" TYPE="char" LENGTH="20" NOTNULL="true" SEQUENCE="false" COMMENT="The name of the enrol plugin at the remote server that was used to enrol our student into their course" PREVIOUS="enroltime"/>
       </FIELDS>
       <KEYS>
diff --git a/mod/assignment/db/install.xml b/mod/assignment/db/install.xml
index 26bf60ceaaa45..a1cfa062d969b 100644
--- a/mod/assignment/db/install.xml
+++ b/mod/assignment/db/install.xml
@@ -1,30 +1,30 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/assignment/db" VERSION="20090420" COMMENT="XMLDB file for Moodle mod/assignment"
+<XMLDB PATH="mod/assignment/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/assignment"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="assignment" COMMENT="Defines assignments" NEXT="assignment_submissions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="assignmenttype"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="assignmenttype"/>
         <FIELD NAME="assignmenttype" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="introformat" NEXT="resubmit"/>
-        <FIELD NAME="resubmit" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assignmenttype" NEXT="preventlate"/>
-        <FIELD NAME="preventlate" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmit" NEXT="emailteachers"/>
-        <FIELD NAME="emailteachers" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="preventlate" NEXT="var1"/>
-        <FIELD NAME="var1" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="emailteachers" NEXT="var2"/>
-        <FIELD NAME="var2" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var1" NEXT="var3"/>
-        <FIELD NAME="var3" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var2" NEXT="var4"/>
-        <FIELD NAME="var4" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var3" NEXT="var5"/>
-        <FIELD NAME="var5" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var4" NEXT="maxbytes"/>
-        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="100000" SEQUENCE="false" PREVIOUS="var5" NEXT="timedue"/>
-        <FIELD NAME="timedue" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxbytes" NEXT="timeavailable"/>
-        <FIELD NAME="timeavailable" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timedue" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailable" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade"/>
+        <FIELD NAME="resubmit" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assignmenttype" NEXT="preventlate"/>
+        <FIELD NAME="preventlate" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmit" NEXT="emailteachers"/>
+        <FIELD NAME="emailteachers" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="preventlate" NEXT="var1"/>
+        <FIELD NAME="var1" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="emailteachers" NEXT="var2"/>
+        <FIELD NAME="var2" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var1" NEXT="var3"/>
+        <FIELD NAME="var3" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var2" NEXT="var4"/>
+        <FIELD NAME="var4" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var3" NEXT="var5"/>
+        <FIELD NAME="var5" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="var4" NEXT="maxbytes"/>
+        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="100000" SEQUENCE="false" PREVIOUS="var5" NEXT="timedue"/>
+        <FIELD NAME="timedue" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxbytes" NEXT="timeavailable"/>
+        <FIELD NAME="timeavailable" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timedue" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailable" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -35,20 +35,20 @@
     </TABLE>
     <TABLE NAME="assignment_submissions" COMMENT="Info about submitted assignments" PREVIOUS="assignment">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="assignment"/>
-        <FIELD NAME="assignment" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assignment" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="numfiles"/>
-        <FIELD NAME="numfiles" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="data1"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="assignment"/>
+        <FIELD NAME="assignment" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assignment" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="numfiles"/>
+        <FIELD NAME="numfiles" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="data1"/>
         <FIELD NAME="data1" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="numfiles" NEXT="data2"/>
         <FIELD NAME="data2" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="data1" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="data2" NEXT="submissioncomment"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="data2" NEXT="submissioncomment"/>
         <FIELD NAME="submissioncomment" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="grade" NEXT="format"/>
-        <FIELD NAME="format" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissioncomment" NEXT="teacher"/>
-        <FIELD NAME="teacher" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="timemarked"/>
-        <FIELD NAME="timemarked" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacher" NEXT="mailed"/>
-        <FIELD NAME="mailed" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemarked"/>
+        <FIELD NAME="format" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissioncomment" NEXT="teacher"/>
+        <FIELD NAME="teacher" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="format" NEXT="timemarked"/>
+        <FIELD NAME="timemarked" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacher" NEXT="mailed"/>
+        <FIELD NAME="mailed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemarked"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="assignment"/>
diff --git a/mod/chat/db/install.xml b/mod/chat/db/install.xml
index df6e4b461030a..4830c77af61b8 100644
--- a/mod/chat/db/install.xml
+++ b/mod/chat/db/install.xml
@@ -1,21 +1,21 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/chat/db" VERSION="20090420" COMMENT="XMLDB file for Moodle mod/chat"
+<XMLDB PATH="mod/chat/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/chat"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="chat" COMMENT="Each of these is a chat room" NEXT="chat_messages">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field" PREVIOUS="intro" NEXT="keepdays"/>
-        <FIELD NAME="keepdays" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="studentlogs"/>
-        <FIELD NAME="studentlogs" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="keepdays" NEXT="chattime"/>
-        <FIELD NAME="chattime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="studentlogs" NEXT="schedule"/>
-        <FIELD NAME="schedule" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="chattime" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="schedule"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field" PREVIOUS="intro" NEXT="keepdays"/>
+        <FIELD NAME="keepdays" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="studentlogs"/>
+        <FIELD NAME="studentlogs" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="keepdays" NEXT="chattime"/>
+        <FIELD NAME="chattime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="studentlogs" NEXT="schedule"/>
+        <FIELD NAME="schedule" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="chattime" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="schedule"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -26,13 +26,13 @@
     </TABLE>
     <TABLE NAME="chat_messages" COMMENT="Stores all the actual chat messages" PREVIOUS="chat" NEXT="chat_messages_current">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="chatid"/>
-        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="system"/>
-        <FIELD NAME="system" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="message"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="chatid"/>
+        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="system"/>
+        <FIELD NAME="system" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="message"/>
         <FIELD NAME="message" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="system" NEXT="timestamp"/>
-        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
+        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="chatid"/>
@@ -46,13 +46,13 @@
     </TABLE>
     <TABLE NAME="chat_messages_current" COMMENT="Stores current session" PREVIOUS="chat_messages" NEXT="chat_users">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="chatid"/>
-        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="system"/>
-        <FIELD NAME="system" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="message"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="chatid"/>
+        <FIELD NAME="chatid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="system"/>
+        <FIELD NAME="system" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="message"/>
         <FIELD NAME="message" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="system" NEXT="timestamp"/>
-        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
+        <FIELD NAME="timestamp" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="chatid"/>
@@ -66,17 +66,17 @@
     </TABLE>
     <TABLE NAME="chat_users" COMMENT="Keeps track of which users are in which chat rooms" PREVIOUS="chat_messages_current">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="chatid"/>
-        <FIELD NAME="chatid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="version"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="chatid"/>
+        <FIELD NAME="chatid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="chatid" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="version"/>
         <FIELD NAME="version" TYPE="char" LENGTH="16" NOTNULL="true" SEQUENCE="false" PREVIOUS="groupid" NEXT="ip"/>
         <FIELD NAME="ip" TYPE="char" LENGTH="45" NOTNULL="true" SEQUENCE="false" PREVIOUS="version" NEXT="firstping"/>
-        <FIELD NAME="firstping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="lastping"/>
-        <FIELD NAME="lastping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstping" NEXT="lastmessageping"/>
-        <FIELD NAME="lastmessageping" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastping" NEXT="sid"/>
+        <FIELD NAME="firstping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ip" NEXT="lastping"/>
+        <FIELD NAME="lastping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstping" NEXT="lastmessageping"/>
+        <FIELD NAME="lastmessageping" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lastping" NEXT="sid"/>
         <FIELD NAME="sid" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="lastmessageping" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sid" NEXT="lang"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sid" NEXT="lang"/>
         <FIELD NAME="lang" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="course"/>
       </FIELDS>
       <KEYS>
diff --git a/mod/choice/db/install.xml b/mod/choice/db/install.xml
index b60d4f44ae307..2b3e017695ef3 100644
--- a/mod/choice/db/install.xml
+++ b/mod/choice/db/install.xml
@@ -1,28 +1,28 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/choice/db" VERSION="20101013" COMMENT="XMLDB file for Moodle mod/choice"
+<XMLDB PATH="mod/choice/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/choice"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="choice" COMMENT="Available choices are stored here" NEXT="choice_options">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="publish"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="publish"/>
 
-        <FIELD NAME="publish" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="showresults"/>
-        <FIELD NAME="showresults" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showresults" NEXT="allowupdate"/>
-        <FIELD NAME="allowupdate" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="display" NEXT="showunanswered"/>
-        <FIELD NAME="showunanswered" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="allowupdate" NEXT="limitanswers"/>
-        <FIELD NAME="limitanswers" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showunanswered" NEXT="timeopen"/>
-        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="limitanswers" NEXT="timeclose"/>
-        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose" NEXT="completionsubmit"/>
+        <FIELD NAME="publish" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="showresults"/>
+        <FIELD NAME="showresults" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showresults" NEXT="allowupdate"/>
+        <FIELD NAME="allowupdate" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="display" NEXT="showunanswered"/>
+        <FIELD NAME="showunanswered" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="allowupdate" NEXT="limitanswers"/>
+        <FIELD NAME="limitanswers" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showunanswered" NEXT="timeopen"/>
+        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="limitanswers" NEXT="timeclose"/>
+        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose" NEXT="completionsubmit"/>
 
-        <FIELD NAME="completionsubmit" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1, then the activity will be automatically marked as 'complete' once the user submits their choice." PREVIOUS="timemodified"/>
+        <FIELD NAME="completionsubmit" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1, then the activity will be automatically marked as 'complete' once the user submits their choice." PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -34,11 +34,11 @@
 
     <TABLE NAME="choice_options" COMMENT="available options to choice" PREVIOUS="choice" NEXT="choice_answers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="choiceid"/>
-        <FIELD NAME="choiceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="text"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="choiceid"/>
+        <FIELD NAME="choiceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="text"/>
         <FIELD NAME="text" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="choiceid" NEXT="maxanswers"/>
-        <FIELD NAME="maxanswers" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="text" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxanswers"/>
+        <FIELD NAME="maxanswers" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="text" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxanswers"/>
       </FIELDS>
       <KEYS>
 
@@ -48,12 +48,12 @@
     </TABLE>
     <TABLE NAME="choice_answers" COMMENT="choices performed by users" PREVIOUS="choice_options">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="choiceid"/>
-        <FIELD NAME="choiceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="choiceid" NEXT="optionid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="choiceid"/>
+        <FIELD NAME="choiceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="choiceid" NEXT="optionid"/>
 
-        <FIELD NAME="optionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="optionid"/>
+        <FIELD NAME="optionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="optionid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="choiceid"/>
diff --git a/mod/data/db/install.xml b/mod/data/db/install.xml
index 58f086eb7029d..95d77e04ceaca 100644
--- a/mod/data/db/install.xml
+++ b/mod/data/db/install.xml
@@ -1,25 +1,25 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/data/db" VERSION="20100428" COMMENT="XMLDB file for Moodle mod/data"
+<XMLDB PATH="mod/data/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/data"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="data" COMMENT="all database activities" NEXT="data_fields">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="comments"/>
-        <FIELD NAME="comments" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timeavailablefrom"/>
-        <FIELD NAME="timeavailablefrom" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="comments" NEXT="timeavailableto"/>
-        <FIELD NAME="timeavailableto" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailablefrom" NEXT="timeviewfrom"/>
-        <FIELD NAME="timeviewfrom" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailableto" NEXT="timeviewto"/>
-        <FIELD NAME="timeviewto" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeviewfrom" NEXT="requiredentries"/>
-        <FIELD NAME="requiredentries" TYPE="int" LENGTH="8" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeviewto" NEXT="requiredentriestoview"/>
-        <FIELD NAME="requiredentriestoview" TYPE="int" LENGTH="8" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requiredentries" NEXT="maxentries"/>
-        <FIELD NAME="maxentries" TYPE="int" LENGTH="8" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requiredentriestoview" NEXT="rssarticles"/>
-        <FIELD NAME="rssarticles" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxentries" NEXT="singletemplate"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="comments"/>
+        <FIELD NAME="comments" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timeavailablefrom"/>
+        <FIELD NAME="timeavailablefrom" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="comments" NEXT="timeavailableto"/>
+        <FIELD NAME="timeavailableto" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailablefrom" NEXT="timeviewfrom"/>
+        <FIELD NAME="timeviewfrom" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeavailableto" NEXT="timeviewto"/>
+        <FIELD NAME="timeviewto" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeviewfrom" NEXT="requiredentries"/>
+        <FIELD NAME="requiredentries" TYPE="int" LENGTH="8" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeviewto" NEXT="requiredentriestoview"/>
+        <FIELD NAME="requiredentriestoview" TYPE="int" LENGTH="8" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requiredentries" NEXT="maxentries"/>
+        <FIELD NAME="maxentries" TYPE="int" LENGTH="8" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="requiredentriestoview" NEXT="rssarticles"/>
+        <FIELD NAME="rssarticles" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxentries" NEXT="singletemplate"/>
         <FIELD NAME="singletemplate" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="rssarticles" NEXT="listtemplate"/>
         <FIELD NAME="listtemplate" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="singletemplate" NEXT="listtemplateheader"/>
         <FIELD NAME="listtemplateheader" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="listtemplate" NEXT="listtemplatefooter"/>
@@ -30,15 +30,15 @@
         <FIELD NAME="csstemplate" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="rsstitletemplate" NEXT="jstemplate"/>
         <FIELD NAME="jstemplate" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="csstemplate" NEXT="asearchtemplate"/>
         <FIELD NAME="asearchtemplate" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="jstemplate" NEXT="approval"/>
-        <FIELD NAME="approval" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="asearchtemplate" NEXT="scale"/>
-        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="approval" NEXT="assessed"/>
-        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="assesstimestart"/>
-        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
-        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="defaultsort"/>
-        <FIELD NAME="defaultsort" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="defaultsortdir"/>
-        <FIELD NAME="defaultsortdir" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultsort" NEXT="editany"/>
-        <FIELD NAME="editany" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultsortdir" NEXT="notification"/>
-        <FIELD NAME="notification" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Notify people when things change" PREVIOUS="editany"/>
+        <FIELD NAME="approval" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="asearchtemplate" NEXT="scale"/>
+        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="approval" NEXT="assessed"/>
+        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="assesstimestart"/>
+        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
+        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="defaultsort"/>
+        <FIELD NAME="defaultsort" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="defaultsortdir"/>
+        <FIELD NAME="defaultsortdir" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultsort" NEXT="editany"/>
+        <FIELD NAME="editany" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="defaultsortdir" NEXT="notification"/>
+        <FIELD NAME="notification" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Notify people when things change" PREVIOUS="editany"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -49,8 +49,8 @@
     </TABLE>
     <TABLE NAME="data_fields" COMMENT="every field available" PREVIOUS="data" NEXT="data_records">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="dataid"/>
-        <FIELD NAME="dataid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="type"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="dataid"/>
+        <FIELD NAME="dataid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="dataid" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="type" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="param1"/>
@@ -75,13 +75,13 @@
     </TABLE>
     <TABLE NAME="data_records" COMMENT="every record introduced" PREVIOUS="data_fields" NEXT="data_content">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="dataid"/>
-        <FIELD NAME="dataid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dataid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="approved"/>
-        <FIELD NAME="approved" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="dataid"/>
+        <FIELD NAME="dataid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="dataid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="approved"/>
+        <FIELD NAME="approved" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="dataid"/>
@@ -90,9 +90,9 @@
     </TABLE>
     <TABLE NAME="data_content" COMMENT="the content introduced in each record/fields" PREVIOUS="data_records">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="fieldid"/>
-        <FIELD NAME="fieldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="recordid"/>
-        <FIELD NAME="recordid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="fieldid" NEXT="content"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="fieldid"/>
+        <FIELD NAME="fieldid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="recordid"/>
+        <FIELD NAME="recordid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="fieldid" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="recordid" NEXT="content1"/>
         <FIELD NAME="content1" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="content" NEXT="content2"/>
         <FIELD NAME="content2" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="content1" NEXT="content3"/>
diff --git a/mod/feedback/db/install.xml b/mod/feedback/db/install.xml
index 9aaba279aa4e0..ffbed2173aa68 100644
--- a/mod/feedback/db/install.xml
+++ b/mod/feedback/db/install.xml
@@ -1,28 +1,28 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/feedback/db" VERSION="20091120" COMMENT="XMLDB file for Moodle mod/feedback"
+<XMLDB PATH="mod/feedback/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/feedback"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="feedback" COMMENT="all feedbacks" NEXT="feedback_template">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="anonymous"/>
-        <FIELD NAME="anonymous" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="introformat" NEXT="email_notification"/>
-        <FIELD NAME="email_notification" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="anonymous" NEXT="multiple_submit"/>
-        <FIELD NAME="multiple_submit" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="email_notification" NEXT="autonumbering"/>
-        <FIELD NAME="autonumbering" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="multiple_submit" NEXT="site_after_submit"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="anonymous"/>
+        <FIELD NAME="anonymous" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="introformat" NEXT="email_notification"/>
+        <FIELD NAME="email_notification" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="anonymous" NEXT="multiple_submit"/>
+        <FIELD NAME="multiple_submit" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="email_notification" NEXT="autonumbering"/>
+        <FIELD NAME="autonumbering" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="multiple_submit" NEXT="site_after_submit"/>
         <FIELD NAME="site_after_submit" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="autonumbering" NEXT="page_after_submit"/>
         <FIELD NAME="page_after_submit" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="site_after_submit" NEXT="page_after_submitformat"/>
-        <FIELD NAME="page_after_submitformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="page_after_submit" NEXT="publish_stats"/>
-        <FIELD NAME="publish_stats" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="page_after_submitformat" NEXT="timeopen"/>
-        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish_stats" NEXT="timeclose"/>
-        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose" NEXT="completionsubmit"/>
-        <FIELD NAME="completionsubmit" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1, then the activity will be automatically marked as 'complete' once the user submits their choice." PREVIOUS="timemodified"/>
+        <FIELD NAME="page_after_submitformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="page_after_submit" NEXT="publish_stats"/>
+        <FIELD NAME="publish_stats" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="page_after_submitformat" NEXT="timeopen"/>
+        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="publish_stats" NEXT="timeclose"/>
+        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose" NEXT="completionsubmit"/>
+        <FIELD NAME="completionsubmit" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If this field is set to 1, then the activity will be automatically marked as 'complete' once the user submits their choice." PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for feedback"/>
@@ -33,9 +33,9 @@
     </TABLE>
     <TABLE NAME="feedback_template" COMMENT="templates of feedbackstructures" PREVIOUS="feedback" NEXT="feedback_item">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="ispublic"/>
-        <FIELD NAME="ispublic" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="ispublic"/>
+        <FIELD NAME="ispublic" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="ispublic"/>
       </FIELDS>
       <KEYS>
@@ -47,17 +47,17 @@
     </TABLE>
     <TABLE NAME="feedback_item" COMMENT="feedback_items" PREVIOUS="feedback_template" NEXT="feedback_completed">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="feedback"/>
-        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="template"/>
-        <FIELD NAME="template" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="feedback"/>
+        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="template"/>
+        <FIELD NAME="template" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="template" NEXT="label"/>
         <FIELD NAME="label" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="presentation"/>
         <FIELD NAME="presentation" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="label" NEXT="typ"/>
         <FIELD NAME="typ" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="presentation" NEXT="hasvalue"/>
-        <FIELD NAME="hasvalue" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="typ" NEXT="position"/>
-        <FIELD NAME="position" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hasvalue" NEXT="required"/>
-        <FIELD NAME="required" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="position" NEXT="dependitem"/>
-        <FIELD NAME="dependitem" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="required" NEXT="dependvalue"/>
+        <FIELD NAME="hasvalue" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="typ" NEXT="position"/>
+        <FIELD NAME="position" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hasvalue" NEXT="required"/>
+        <FIELD NAME="required" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="position" NEXT="dependitem"/>
+        <FIELD NAME="dependitem" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="required" NEXT="dependvalue"/>
         <FIELD NAME="dependvalue" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="dependitem" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="dependvalue"/>
       </FIELDS>
@@ -69,12 +69,12 @@
     </TABLE>
     <TABLE NAME="feedback_completed" COMMENT="filled out feedback" PREVIOUS="feedback_item" NEXT="feedback_completedtmp">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="feedback"/>
-        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="random_response"/>
-        <FIELD NAME="random_response" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="anonymous_response"/>
-        <FIELD NAME="anonymous_response" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="random_response"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="feedback"/>
+        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="random_response"/>
+        <FIELD NAME="random_response" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="anonymous_response"/>
+        <FIELD NAME="anonymous_response" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="random_response"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for feedback_completed" NEXT="feedback"/>
@@ -86,13 +86,13 @@
     </TABLE>
     <TABLE NAME="feedback_completedtmp" COMMENT="filled out feedback" PREVIOUS="feedback_completed" NEXT="feedback_value">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="feedback"/>
-        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="guestid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="feedback"/>
+        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="guestid"/>
         <FIELD NAME="guestid" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="guestid" NEXT="random_response"/>
-        <FIELD NAME="random_response" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="anonymous_response"/>
-        <FIELD NAME="anonymous_response" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="random_response"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="guestid" NEXT="random_response"/>
+        <FIELD NAME="random_response" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="anonymous_response"/>
+        <FIELD NAME="anonymous_response" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="random_response"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for feedback_completedtmp" NEXT="feedback"/>
@@ -104,11 +104,11 @@
     </TABLE>
     <TABLE NAME="feedback_value" COMMENT="values of the completeds" PREVIOUS="feedback_completedtmp" NEXT="feedback_valuetmp">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course_id"/>
-        <FIELD NAME="course_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="item"/>
-        <FIELD NAME="item" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course_id" NEXT="completed"/>
-        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item" NEXT="tmp_completed"/>
-        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed" NEXT="value"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course_id"/>
+        <FIELD NAME="course_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="item"/>
+        <FIELD NAME="item" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course_id" NEXT="completed"/>
+        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item" NEXT="tmp_completed"/>
+        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="tmp_completed"/>
       </FIELDS>
       <KEYS>
@@ -121,11 +121,11 @@
     </TABLE>
     <TABLE NAME="feedback_valuetmp" COMMENT="values of the completedstmp" PREVIOUS="feedback_value" NEXT="feedback_tracking">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course_id"/>
-        <FIELD NAME="course_id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="item"/>
-        <FIELD NAME="item" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course_id" NEXT="completed"/>
-        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item" NEXT="tmp_completed"/>
-        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed" NEXT="value"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course_id"/>
+        <FIELD NAME="course_id" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="item"/>
+        <FIELD NAME="item" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course_id" NEXT="completed"/>
+        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="item" NEXT="tmp_completed"/>
+        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="tmp_completed"/>
       </FIELDS>
       <KEYS>
@@ -138,11 +138,11 @@
     </TABLE>
     <TABLE NAME="feedback_tracking" COMMENT="feedback trackingdata" PREVIOUS="feedback_valuetmp" NEXT="feedback_sitecourse_map">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="feedback"/>
-        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="completed"/>
-        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="tmp_completed"/>
-        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="feedback"/>
+        <FIELD NAME="feedback" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="completed"/>
+        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="tmp_completed"/>
+        <FIELD NAME="tmp_completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="completed"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for feedback_tracking" NEXT="feedback"/>
@@ -155,9 +155,9 @@
     </TABLE>
     <TABLE NAME="feedback_sitecourse_map" COMMENT="feedback sitecourse map" PREVIOUS="feedback_tracking">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="feedbackid"/>
-        <FIELD NAME="feedbackid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="courseid"/>
-        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="feedbackid"/>
+        <FIELD NAME="feedbackid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="courseid"/>
+        <FIELD NAME="courseid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for feedback_tracking" NEXT="feedbackid"/>
diff --git a/mod/folder/db/install.xml b/mod/folder/db/install.xml
index 79ed1325c4bca..a0b3e309c0be3 100644
--- a/mod/folder/db/install.xml
+++ b/mod/folder/db/install.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/folder/db" VERSION="20090722" COMMENT="XMLDB file for Folder module"
+<XMLDB PATH="mod/folder/db" VERSION="20120122" COMMENT="XMLDB file for Folder module"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="folder" COMMENT="each record is one folder resource">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="revision"/>
-        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="introformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="revision"/>
+        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="introformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/forum/db/install.xml b/mod/forum/db/install.xml
index 13473f4415b9e..98cc4bed9ddd9 100644
--- a/mod/forum/db/install.xml
+++ b/mod/forum/db/install.xml
@@ -1,34 +1,34 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/forum/db" VERSION="20100322" COMMENT="XMLDB file for Moodle mod/forum"
+<XMLDB PATH="mod/forum/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/forum"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="forum" COMMENT="Forums contain and structure discussion" NEXT="forum_discussions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="type"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="general" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="type" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field" PREVIOUS="intro" NEXT="assessed"/>
-        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="assesstimestart"/>
-        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
-        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="scale"/>
-        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="maxbytes"/>
-        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="maxattachments"/>
-        <FIELD NAME="maxattachments" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="Number of attachments allowed per post" PREVIOUS="maxbytes" NEXT="forcesubscribe"/>
-        <FIELD NAME="forcesubscribe" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxattachments" NEXT="trackingtype"/>
-        <FIELD NAME="trackingtype" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="forcesubscribe" NEXT="rsstype"/>
-        <FIELD NAME="rsstype" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="trackingtype" NEXT="rssarticles"/>
-        <FIELD NAME="rssarticles" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rsstype" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rssarticles" NEXT="warnafter"/>
-        <FIELD NAME="warnafter" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="blockafter"/>
-        <FIELD NAME="blockafter" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="warnafter" NEXT="blockperiod"/>
-        <FIELD NAME="blockperiod" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="blockafter" NEXT="completiondiscussions"/>
-        <FIELD NAME="completiondiscussions" TYPE="int" LENGTH="9" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts are required to mark this forum completed for a user." PREVIOUS="blockperiod" NEXT="completionreplies"/>
-        <FIELD NAME="completionreplies" TYPE="int" LENGTH="9" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of replies are required to mark this forum complete for a user." PREVIOUS="completiondiscussions" NEXT="completionposts"/>
-        <FIELD NAME="completionposts" TYPE="int" LENGTH="9" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts or replies (total) are required to mark this forum complete for a user." PREVIOUS="completionreplies"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field" PREVIOUS="intro" NEXT="assessed"/>
+        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="assesstimestart"/>
+        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
+        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="scale"/>
+        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="maxbytes"/>
+        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="maxattachments"/>
+        <FIELD NAME="maxattachments" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Number of attachments allowed per post" PREVIOUS="maxbytes" NEXT="forcesubscribe"/>
+        <FIELD NAME="forcesubscribe" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxattachments" NEXT="trackingtype"/>
+        <FIELD NAME="trackingtype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="forcesubscribe" NEXT="rsstype"/>
+        <FIELD NAME="rsstype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="trackingtype" NEXT="rssarticles"/>
+        <FIELD NAME="rssarticles" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rsstype" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rssarticles" NEXT="warnafter"/>
+        <FIELD NAME="warnafter" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="blockafter"/>
+        <FIELD NAME="blockafter" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="warnafter" NEXT="blockperiod"/>
+        <FIELD NAME="blockperiod" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="blockafter" NEXT="completiondiscussions"/>
+        <FIELD NAME="completiondiscussions" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts are required to mark this forum completed for a user." PREVIOUS="blockperiod" NEXT="completionreplies"/>
+        <FIELD NAME="completionreplies" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of replies are required to mark this forum complete for a user." PREVIOUS="completiondiscussions" NEXT="completionposts"/>
+        <FIELD NAME="completionposts" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts or replies (total) are required to mark this forum complete for a user." PREVIOUS="completionreplies"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -39,18 +39,18 @@
     </TABLE>
     <TABLE NAME="forum_discussions" COMMENT="Forums are composed of discussions" PREVIOUS="forum" NEXT="forum_posts">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forum"/>
-        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forum"/>
+        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="forum" NEXT="firstpost"/>
-        <FIELD NAME="firstpost" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstpost" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="-1" SEQUENCE="false" PREVIOUS="userid" NEXT="assessed"/>
-        <FIELD NAME="assessed" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="groupid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="usermodified"/>
-        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="timestart"/>
-        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="usermodified" NEXT="timeend"/>
-        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart"/>
+        <FIELD NAME="firstpost" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstpost" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="-1" SEQUENCE="false" PREVIOUS="userid" NEXT="assessed"/>
+        <FIELD NAME="assessed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="groupid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="usermodified"/>
+        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="timestart"/>
+        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="usermodified" NEXT="timeend"/>
+        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="forum"/>
@@ -62,20 +62,20 @@
     </TABLE>
     <TABLE NAME="forum_posts" COMMENT="All posts are stored in this table" PREVIOUS="forum_discussions" NEXT="forum_queue">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="discussion"/>
-        <FIELD NAME="discussion" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="parent"/>
-        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussion" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parent" NEXT="created"/>
-        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modified"/>
-        <FIELD NAME="modified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="created" NEXT="mailed"/>
-        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modified" NEXT="subject"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="discussion"/>
+        <FIELD NAME="discussion" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="parent"/>
+        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussion" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parent" NEXT="created"/>
+        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="modified"/>
+        <FIELD NAME="modified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="created" NEXT="mailed"/>
+        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modified" NEXT="subject"/>
         <FIELD NAME="subject" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="mailed" NEXT="message"/>
         <FIELD NAME="message" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="subject" NEXT="messageformat"/>
-        <FIELD NAME="messageformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="message" NEXT="messagetrust"/>
-        <FIELD NAME="messagetrust" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="messageformat" NEXT="attachment"/>
+        <FIELD NAME="messageformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="message" NEXT="messagetrust"/>
+        <FIELD NAME="messagetrust" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="messageformat" NEXT="attachment"/>
         <FIELD NAME="attachment" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="messagetrust" NEXT="totalscore"/>
-        <FIELD NAME="totalscore" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="attachment" NEXT="mailnow"/>
-        <FIELD NAME="mailnow" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="totalscore"/>
+        <FIELD NAME="totalscore" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attachment" NEXT="mailnow"/>
+        <FIELD NAME="mailnow" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="totalscore"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="discussion"/>
@@ -90,11 +90,11 @@
     </TABLE>
     <TABLE NAME="forum_queue" COMMENT="For keeping track of posts that will be mailed in digest form" PREVIOUS="forum_posts" NEXT="forum_subscriptions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="discussionid"/>
-        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="postid"/>
-        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussionid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The modified time of the original post" PREVIOUS="postid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="discussionid"/>
+        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="postid"/>
+        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussionid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The modified time of the original post" PREVIOUS="postid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="discussionid"/>
@@ -107,9 +107,9 @@
     </TABLE>
     <TABLE NAME="forum_subscriptions" COMMENT="Keeps track of who is subscribed to what forum" PREVIOUS="forum_queue" NEXT="forum_read">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forum"/>
-        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forum"/>
+        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="forum"/>
@@ -121,13 +121,13 @@
     </TABLE>
     <TABLE NAME="forum_read" COMMENT="Tracks each users read posts" PREVIOUS="forum_subscriptions" NEXT="forum_track_prefs">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forumid"/>
-        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="discussionid"/>
-        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="forumid" NEXT="postid"/>
-        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussionid" NEXT="firstread"/>
-        <FIELD NAME="firstread" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="postid" NEXT="lastread"/>
-        <FIELD NAME="lastread" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstread"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forumid"/>
+        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="discussionid"/>
+        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="forumid" NEXT="postid"/>
+        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="discussionid" NEXT="firstread"/>
+        <FIELD NAME="firstread" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="postid" NEXT="lastread"/>
+        <FIELD NAME="lastread" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="firstread"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -140,9 +140,9 @@
     </TABLE>
     <TABLE NAME="forum_track_prefs" COMMENT="Tracks each users untracked forums" PREVIOUS="forum_read">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forumid"/>
-        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="forumid"/>
+        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/glossary/db/install.xml b/mod/glossary/db/install.xml
index 757f028904edf..456d808d75322 100644
--- a/mod/glossary/db/install.xml
+++ b/mod/glossary/db/install.xml
@@ -1,39 +1,39 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/glossary/db" VERSION="20120104" COMMENT="XMLDB file for Moodle mod/glossary"
+<XMLDB PATH="mod/glossary/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/glossary"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="glossary" COMMENT="all glossaries" NEXT="glossary_entries">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="allowduplicatedentries"/>
-        <FIELD NAME="allowduplicatedentries" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="displayformat"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="allowduplicatedentries"/>
+        <FIELD NAME="allowduplicatedentries" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="displayformat"/>
         <FIELD NAME="displayformat" TYPE="char" LENGTH="50" NOTNULL="true" DEFAULT="dictionary" SEQUENCE="false" PREVIOUS="allowduplicatedentries" NEXT="mainglossary"/>
-        <FIELD NAME="mainglossary" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayformat" NEXT="showspecial"/>
-        <FIELD NAME="showspecial" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="mainglossary" NEXT="showalphabet"/>
-        <FIELD NAME="showalphabet" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showspecial" NEXT="showall"/>
-        <FIELD NAME="showall" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showalphabet" NEXT="allowcomments"/>
-        <FIELD NAME="allowcomments" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showall" NEXT="allowprintview"/>
-        <FIELD NAME="allowprintview" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="allowcomments" NEXT="usedynalink"/>
-        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="allowprintview" NEXT="defaultapproval"/>
-        <FIELD NAME="defaultapproval" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="usedynalink" NEXT="approvaldisplayformat"/>
+        <FIELD NAME="mainglossary" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayformat" NEXT="showspecial"/>
+        <FIELD NAME="showspecial" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="mainglossary" NEXT="showalphabet"/>
+        <FIELD NAME="showalphabet" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showspecial" NEXT="showall"/>
+        <FIELD NAME="showall" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="showalphabet" NEXT="allowcomments"/>
+        <FIELD NAME="allowcomments" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showall" NEXT="allowprintview"/>
+        <FIELD NAME="allowprintview" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="allowcomments" NEXT="usedynalink"/>
+        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="allowprintview" NEXT="defaultapproval"/>
+        <FIELD NAME="defaultapproval" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="usedynalink" NEXT="approvaldisplayformat"/>
         <FIELD NAME="approvaldisplayformat" TYPE="char" LENGTH="50" NOTNULL="true" DEFAULT="default" SEQUENCE="false" COMMENT="Display Format when approving entries" PREVIOUS="defaultapproval" NEXT="globalglossary"/>
-        <FIELD NAME="globalglossary" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="approvaldisplayformat" NEXT="entbypage"/>
-        <FIELD NAME="entbypage" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="10" SEQUENCE="false" PREVIOUS="globalglossary" NEXT="editalways"/>
-        <FIELD NAME="editalways" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="entbypage" NEXT="rsstype"/>
-        <FIELD NAME="rsstype" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="editalways" NEXT="rssarticles"/>
-        <FIELD NAME="rssarticles" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rsstype" NEXT="assessed"/>
-        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rssarticles" NEXT="assesstimestart"/>
-        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
-        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="scale"/>
-        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="completionentries"/>
-        <FIELD NAME="completionentries" TYPE="int" LENGTH="9" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Non zero if a certain number of entries are required to mark this glossary complete for a user." PREVIOUS="timemodified"/>
+        <FIELD NAME="globalglossary" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="approvaldisplayformat" NEXT="entbypage"/>
+        <FIELD NAME="entbypage" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="10" SEQUENCE="false" PREVIOUS="globalglossary" NEXT="editalways"/>
+        <FIELD NAME="editalways" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="entbypage" NEXT="rsstype"/>
+        <FIELD NAME="rsstype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="editalways" NEXT="rssarticles"/>
+        <FIELD NAME="rssarticles" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rsstype" NEXT="assessed"/>
+        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="rssarticles" NEXT="assesstimestart"/>
+        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessed" NEXT="assesstimefinish"/>
+        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimestart" NEXT="scale"/>
+        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assesstimefinish" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scale" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="completionentries"/>
+        <FIELD NAME="completionentries" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Non zero if a certain number of entries are required to mark this glossary complete for a user." PREVIOUS="timemodified"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -44,22 +44,22 @@
     </TABLE>
     <TABLE NAME="glossary_entries" COMMENT="all glossary entries" PREVIOUS="glossary" NEXT="glossary_alias">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="glossaryid"/>
-        <FIELD NAME="glossaryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="glossaryid" NEXT="concept"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="glossaryid"/>
+        <FIELD NAME="glossaryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="glossaryid" NEXT="concept"/>
         <FIELD NAME="concept" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="definition"/>
         <FIELD NAME="definition" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="concept" NEXT="definitionformat"/>
-        <FIELD NAME="definitionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definition" NEXT="definitiontrust"/>
-        <FIELD NAME="definitiontrust" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definitionformat" NEXT="attachment"/>
+        <FIELD NAME="definitionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definition" NEXT="definitiontrust"/>
+        <FIELD NAME="definitiontrust" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definitionformat" NEXT="attachment"/>
         <FIELD NAME="attachment" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="definitiontrust" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attachment" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="teacherentry"/>
-        <FIELD NAME="teacherentry" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="sourceglossaryid"/>
-        <FIELD NAME="sourceglossaryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacherentry" NEXT="usedynalink"/>
-        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="sourceglossaryid" NEXT="casesensitive"/>
-        <FIELD NAME="casesensitive" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="usedynalink" NEXT="fullmatch"/>
-        <FIELD NAME="fullmatch" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="casesensitive" NEXT="approved"/>
-        <FIELD NAME="approved" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="fullmatch"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attachment" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="teacherentry"/>
+        <FIELD NAME="teacherentry" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="sourceglossaryid"/>
+        <FIELD NAME="sourceglossaryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacherentry" NEXT="usedynalink"/>
+        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="sourceglossaryid" NEXT="casesensitive"/>
+        <FIELD NAME="casesensitive" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="usedynalink" NEXT="fullmatch"/>
+        <FIELD NAME="fullmatch" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="casesensitive" NEXT="approved"/>
+        <FIELD NAME="approved" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="fullmatch"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="glossaryid"/>
@@ -72,8 +72,8 @@
     </TABLE>
     <TABLE NAME="glossary_alias" COMMENT="entries alias" PREVIOUS="glossary_entries" NEXT="glossary_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="entryid"/>
-        <FIELD NAME="entryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="alias"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="entryid"/>
+        <FIELD NAME="entryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="alias"/>
         <FIELD NAME="alias" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="entryid"/>
       </FIELDS>
       <KEYS>
@@ -83,10 +83,10 @@
     </TABLE>
     <TABLE NAME="glossary_categories" COMMENT="all categories for glossary entries" PREVIOUS="glossary_alias" NEXT="glossary_entries_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="glossaryid"/>
-        <FIELD NAME="glossaryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="glossaryid"/>
+        <FIELD NAME="glossaryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="glossaryid" NEXT="usedynalink"/>
-        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="name"/>
+        <FIELD NAME="usedynalink" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="glossaryid"/>
@@ -95,9 +95,9 @@
     </TABLE>
     <TABLE NAME="glossary_entries_categories" COMMENT="categories of each glossary entry" PREVIOUS="glossary_categories" NEXT="glossary_formats">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="categoryid"/>
-        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="entryid"/>
-        <FIELD NAME="entryid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="categoryid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="categoryid"/>
+        <FIELD NAME="categoryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="entryid"/>
+        <FIELD NAME="entryid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="categoryid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="categoryid"/>
@@ -107,11 +107,11 @@
     </TABLE>
     <TABLE NAME="glossary_formats" COMMENT="Setting of the display formats" PREVIOUS="glossary_entries_categories">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="popupformatname"/>
         <FIELD NAME="popupformatname" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="popupformatname" NEXT="showgroup"/>
-        <FIELD NAME="showgroup" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="visible" NEXT="defaultmode"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="popupformatname" NEXT="showgroup"/>
+        <FIELD NAME="showgroup" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="visible" NEXT="defaultmode"/>
         <FIELD NAME="defaultmode" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="showgroup" NEXT="defaulthook"/>
         <FIELD NAME="defaulthook" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="defaultmode" NEXT="sortkey"/>
         <FIELD NAME="sortkey" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="defaulthook" NEXT="sortorder"/>
diff --git a/mod/imscp/db/install.xml b/mod/imscp/db/install.xml
index 0ca98320a87ea..0b7814f2b565a 100644
--- a/mod/imscp/db/install.xml
+++ b/mod/imscp/db/install.xml
@@ -1,20 +1,20 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/imscp/db" VERSION="20090729" COMMENT="XMLDB file for IMS Content Package module "
+<XMLDB PATH="mod/imscp/db" VERSION="20120122" COMMENT="XMLDB file for IMS Content Package module "
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="imscp" COMMENT="each record is one imscp resource">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="revision"/>
-        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="introformat" NEXT="keepold"/>
-        <FIELD NAME="keepold" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="-1" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="revision" NEXT="structure"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="revision"/>
+        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="introformat" NEXT="keepold"/>
+        <FIELD NAME="keepold" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="-1" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="revision" NEXT="structure"/>
         <FIELD NAME="structure" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" PREVIOUS="keepold" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="structure"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="structure"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/label/db/install.xml b/mod/label/db/install.xml
index 11f486c698060..b506868cddb07 100644
--- a/mod/label/db/install.xml
+++ b/mod/label/db/install.xml
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/label/db" VERSION="20090422" COMMENT="XMLDB file for Moodle mod/label"
+<XMLDB PATH="mod/label/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/label"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="label" COMMENT="Defines labels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/lesson/db/install.xml b/mod/lesson/db/install.xml
index ef1e981063efa..9c64b1a736414 100644
--- a/mod/lesson/db/install.xml
+++ b/mod/lesson/db/install.xml
@@ -1,51 +1,51 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/lesson/db" VERSION="20100720" COMMENT="XMLDB file for Moodle mod/lesson"
+<XMLDB PATH="mod/lesson/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/lesson"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="lesson" COMMENT="Defines lesson" NEXT="lesson_pages">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="practice"/>
-        <FIELD NAME="practice" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="modattempts"/>
-        <FIELD NAME="modattempts" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="practice" NEXT="usepassword"/>
-        <FIELD NAME="usepassword" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modattempts" NEXT="password"/>
+        <FIELD NAME="practice" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="modattempts"/>
+        <FIELD NAME="modattempts" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="practice" NEXT="usepassword"/>
+        <FIELD NAME="usepassword" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="modattempts" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="usepassword" NEXT="dependency"/>
-        <FIELD NAME="dependency" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="password" NEXT="conditions"/>
+        <FIELD NAME="dependency" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="password" NEXT="conditions"/>
         <FIELD NAME="conditions" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="dependency" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="conditions" NEXT="custom"/>
-        <FIELD NAME="custom" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="ongoing"/>
-        <FIELD NAME="ongoing" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="custom" NEXT="usemaxgrade"/>
-        <FIELD NAME="usemaxgrade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="ongoing" NEXT="maxanswers"/>
-        <FIELD NAME="maxanswers" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="4" SEQUENCE="false" PREVIOUS="usemaxgrade" NEXT="maxattempts"/>
-        <FIELD NAME="maxattempts" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="5" SEQUENCE="false" PREVIOUS="maxanswers" NEXT="review"/>
-        <FIELD NAME="review" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxattempts" NEXT="nextpagedefault"/>
-        <FIELD NAME="nextpagedefault" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="review" NEXT="feedback"/>
-        <FIELD NAME="feedback" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="nextpagedefault" NEXT="minquestions"/>
-        <FIELD NAME="minquestions" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="maxpages"/>
-        <FIELD NAME="maxpages" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="minquestions" NEXT="timed"/>
-        <FIELD NAME="timed" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxpages" NEXT="maxtime"/>
-        <FIELD NAME="maxtime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timed" NEXT="retake"/>
-        <FIELD NAME="retake" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="maxtime" NEXT="activitylink"/>
-        <FIELD NAME="activitylink" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retake" NEXT="mediafile"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="conditions" NEXT="custom"/>
+        <FIELD NAME="custom" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="ongoing"/>
+        <FIELD NAME="ongoing" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="custom" NEXT="usemaxgrade"/>
+        <FIELD NAME="usemaxgrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="ongoing" NEXT="maxanswers"/>
+        <FIELD NAME="maxanswers" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="4" SEQUENCE="false" PREVIOUS="usemaxgrade" NEXT="maxattempts"/>
+        <FIELD NAME="maxattempts" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="5" SEQUENCE="false" PREVIOUS="maxanswers" NEXT="review"/>
+        <FIELD NAME="review" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxattempts" NEXT="nextpagedefault"/>
+        <FIELD NAME="nextpagedefault" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="review" NEXT="feedback"/>
+        <FIELD NAME="feedback" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="nextpagedefault" NEXT="minquestions"/>
+        <FIELD NAME="minquestions" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="maxpages"/>
+        <FIELD NAME="maxpages" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="minquestions" NEXT="timed"/>
+        <FIELD NAME="timed" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxpages" NEXT="maxtime"/>
+        <FIELD NAME="maxtime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timed" NEXT="retake"/>
+        <FIELD NAME="retake" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="maxtime" NEXT="activitylink"/>
+        <FIELD NAME="activitylink" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retake" NEXT="mediafile"/>
         <FIELD NAME="mediafile" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="activitylink" NEXT="mediaheight" COMMENT="Local file path or full external URL"/>
-        <FIELD NAME="mediaheight" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="100" SEQUENCE="false" PREVIOUS="mediafile" NEXT="mediawidth"/>
-        <FIELD NAME="mediawidth" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="650" SEQUENCE="false" PREVIOUS="mediaheight" NEXT="mediaclose"/>
-        <FIELD NAME="mediaclose" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mediawidth" NEXT="slideshow"/>
-        <FIELD NAME="slideshow" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mediaclose" NEXT="width"/>
-        <FIELD NAME="width" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="640" SEQUENCE="false" PREVIOUS="slideshow" NEXT="height"/>
-        <FIELD NAME="height" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="480" SEQUENCE="false" PREVIOUS="width" NEXT="bgcolor"/>
+        <FIELD NAME="mediaheight" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" PREVIOUS="mediafile" NEXT="mediawidth"/>
+        <FIELD NAME="mediawidth" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="650" SEQUENCE="false" PREVIOUS="mediaheight" NEXT="mediaclose"/>
+        <FIELD NAME="mediaclose" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mediawidth" NEXT="slideshow"/>
+        <FIELD NAME="slideshow" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mediaclose" NEXT="width"/>
+        <FIELD NAME="width" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="640" SEQUENCE="false" PREVIOUS="slideshow" NEXT="height"/>
+        <FIELD NAME="height" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="480" SEQUENCE="false" PREVIOUS="width" NEXT="bgcolor"/>
         <FIELD NAME="bgcolor" TYPE="char" LENGTH="7" NOTNULL="true" DEFAULT="#FFFFFF" SEQUENCE="false" PREVIOUS="height" NEXT="displayleft"/>
-        <FIELD NAME="displayleft" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="bgcolor" NEXT="displayleftif"/>
-        <FIELD NAME="displayleftif" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayleft" NEXT="progressbar"/>
-        <FIELD NAME="progressbar" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayleftif" NEXT="highscores"/>
-        <FIELD NAME="highscores" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="progressbar" NEXT="maxhighscores"/>
-        <FIELD NAME="maxhighscores" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="highscores" NEXT="available"/>
-        <FIELD NAME="available" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxhighscores" NEXT="deadline"/>
-        <FIELD NAME="deadline" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="available" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="deadline"/>
+        <FIELD NAME="displayleft" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="bgcolor" NEXT="displayleftif"/>
+        <FIELD NAME="displayleftif" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayleft" NEXT="progressbar"/>
+        <FIELD NAME="progressbar" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayleftif" NEXT="highscores"/>
+        <FIELD NAME="highscores" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="progressbar" NEXT="maxhighscores"/>
+        <FIELD NAME="maxhighscores" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="highscores" NEXT="available"/>
+        <FIELD NAME="available" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxhighscores" NEXT="deadline"/>
+        <FIELD NAME="deadline" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="available" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="deadline"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -56,19 +56,19 @@
     </TABLE>
     <TABLE NAME="lesson_pages" COMMENT="Defines lesson_pages" PREVIOUS="lesson" NEXT="lesson_answers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="prevpageid"/>
-        <FIELD NAME="prevpageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="nextpageid"/>
-        <FIELD NAME="nextpageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="prevpageid" NEXT="qtype"/>
-        <FIELD NAME="qtype" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nextpageid" NEXT="qoption"/>
-        <FIELD NAME="qoption" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="qtype" NEXT="layout"/>
-        <FIELD NAME="layout" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="qoption" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="layout" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="display" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="title"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="prevpageid"/>
+        <FIELD NAME="prevpageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="nextpageid"/>
+        <FIELD NAME="nextpageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="prevpageid" NEXT="qtype"/>
+        <FIELD NAME="qtype" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nextpageid" NEXT="qoption"/>
+        <FIELD NAME="qoption" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="qtype" NEXT="layout"/>
+        <FIELD NAME="layout" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="qoption" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="layout" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="display" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="title"/>
         <FIELD NAME="title" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="contents"/>
         <FIELD NAME="contents" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="title" NEXT="contentsformat"/>
-        <FIELD NAME="contentsformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contents"/>
+        <FIELD NAME="contentsformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contents"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -77,19 +77,19 @@
     </TABLE>
     <TABLE NAME="lesson_answers" COMMENT="Defines lesson_answers" PREVIOUS="lesson_pages" NEXT="lesson_attempts">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="jumpto"/>
-        <FIELD NAME="jumpto" TYPE="int" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="jumpto" NEXT="score"/>
-        <FIELD NAME="score" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="flags"/>
-        <FIELD NAME="flags" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="score" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="flags" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="answer"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="jumpto"/>
+        <FIELD NAME="jumpto" TYPE="int" LENGTH="11" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="jumpto" NEXT="score"/>
+        <FIELD NAME="score" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="flags"/>
+        <FIELD NAME="flags" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="score" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="flags" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="answer"/>
         <FIELD NAME="answer" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="timemodified" NEXT="answerformat"/>
-        <FIELD NAME="answerformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="response"/>
+        <FIELD NAME="answerformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answer" NEXT="response"/>
         <FIELD NAME="response" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="answerformat" NEXT="responseformat"/>
-        <FIELD NAME="responseformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="response"/>
+        <FIELD NAME="responseformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="response"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -99,15 +99,15 @@
     </TABLE>
     <TABLE NAME="lesson_attempts" COMMENT="Defines lesson_attempts" PREVIOUS="lesson_answers" NEXT="lesson_grades">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="answerid"/>
-        <FIELD NAME="answerid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="retry"/>
-        <FIELD NAME="retry" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answerid" NEXT="correct"/>
-        <FIELD NAME="correct" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retry" NEXT="useranswer"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="answerid"/>
+        <FIELD NAME="answerid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="retry"/>
+        <FIELD NAME="retry" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="answerid" NEXT="correct"/>
+        <FIELD NAME="correct" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retry" NEXT="useranswer"/>
         <FIELD NAME="useranswer" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="correct" NEXT="timeseen"/>
-        <FIELD NAME="timeseen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useranswer"/>
+        <FIELD NAME="timeseen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="useranswer"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -121,12 +121,12 @@
     </TABLE>
     <TABLE NAME="lesson_grades" COMMENT="Defines lesson_grades" PREVIOUS="lesson_attempts" NEXT="lesson_timer">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="float" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="late"/>
-        <FIELD NAME="late" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="completed"/>
-        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="late"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="float" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="late"/>
+        <FIELD NAME="late" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="completed"/>
+        <FIELD NAME="completed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="late"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -138,11 +138,11 @@
     </TABLE>
     <TABLE NAME="lesson_timer" COMMENT="lesson timer for each lesson" PREVIOUS="lesson_grades" NEXT="lesson_branch">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="starttime"/>
-        <FIELD NAME="starttime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="lessontime"/>
-        <FIELD NAME="lessontime" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="starttime"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="starttime"/>
+        <FIELD NAME="starttime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="lessontime"/>
+        <FIELD NAME="lessontime" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="starttime"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -154,13 +154,13 @@
     </TABLE>
     <TABLE NAME="lesson_branch" COMMENT="branches for each lesson/user" PREVIOUS="lesson_timer" NEXT="lesson_high_scores">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="retry"/>
-        <FIELD NAME="retry" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="flag"/>
-        <FIELD NAME="flag" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retry" NEXT="timeseen"/>
-        <FIELD NAME="timeseen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="flag"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="retry"/>
+        <FIELD NAME="retry" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="pageid" NEXT="flag"/>
+        <FIELD NAME="flag" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="retry" NEXT="timeseen"/>
+        <FIELD NAME="timeseen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="flag"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="lessonid"/>
@@ -173,10 +173,10 @@
     </TABLE>
     <TABLE NAME="lesson_high_scores" COMMENT="high scores for each lesson" PREVIOUS="lesson_branch">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="lessonid"/>
-        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="gradeid"/>
-        <FIELD NAME="gradeid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="nickname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="lessonid"/>
+        <FIELD NAME="lessonid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lessonid" NEXT="gradeid"/>
+        <FIELD NAME="gradeid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="nickname"/>
         <FIELD NAME="nickname" TYPE="char" LENGTH="5" NOTNULL="true" SEQUENCE="false" PREVIOUS="gradeid"/>
       </FIELDS>
       <KEYS>
diff --git a/mod/lti/db/install.xml b/mod/lti/db/install.xml
index 2df3df50e7b73..5ffb8445408cc 100644
--- a/mod/lti/db/install.xml
+++ b/mod/lti/db/install.xml
@@ -1,34 +1,34 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/lti/db" VERSION="20111116" COMMENT="XMLDB file for Moodle mod/lti"
+<XMLDB PATH="mod/lti/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/lti"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="lti" COMMENT="This table contains Basic LTI activities instances" NEXT="lti_types">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Course basiclti activity belongs to" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Course basiclti activity belongs to" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="name field for moodle instances" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="General introduction of the basiclti activity" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the intro field (MOODLE, HTML, MARKDOWN...)" PREVIOUS="intro" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="typeid"/>
-        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Basic LTI type" PREVIOUS="timemodified" NEXT="toolurl"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the intro field (MOODLE, HTML, MARKDOWN...)" PREVIOUS="intro" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="typeid"/>
+        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Basic LTI type" PREVIOUS="timemodified" NEXT="toolurl"/>
         <FIELD NAME="toolurl" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Remote tool url" PREVIOUS="typeid" NEXT="securetoolurl"/>
         <FIELD NAME="securetoolurl" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="toolurl" NEXT="instructorchoicesendname"/>
-        <FIELD NAME="instructorchoicesendname" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Send user's name" PREVIOUS="securetoolurl" NEXT="instructorchoicesendemailaddr"/>
-        <FIELD NAME="instructorchoicesendemailaddr" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Send user's email" PREVIOUS="instructorchoicesendname" NEXT="instructorchoiceallowroster"/>
-        <FIELD NAME="instructorchoiceallowroster" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Allow the roster to be retrieved" PREVIOUS="instructorchoicesendemailaddr" NEXT="instructorchoiceallowsetting"/>
-        <FIELD NAME="instructorchoiceallowsetting" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Allow a tool to store a setting" PREVIOUS="instructorchoiceallowroster" NEXT="instructorcustomparameters"/>
+        <FIELD NAME="instructorchoicesendname" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Send user's name" PREVIOUS="securetoolurl" NEXT="instructorchoicesendemailaddr"/>
+        <FIELD NAME="instructorchoicesendemailaddr" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Send user's email" PREVIOUS="instructorchoicesendname" NEXT="instructorchoiceallowroster"/>
+        <FIELD NAME="instructorchoiceallowroster" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Allow the roster to be retrieved" PREVIOUS="instructorchoicesendemailaddr" NEXT="instructorchoiceallowsetting"/>
+        <FIELD NAME="instructorchoiceallowsetting" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Allow a tool to store a setting" PREVIOUS="instructorchoiceallowroster" NEXT="instructorcustomparameters"/>
         <FIELD NAME="instructorcustomparameters" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Additional custom parameters provided by the instructor" PREVIOUS="instructorchoiceallowsetting" NEXT="instructorchoiceacceptgrades"/>
-        <FIELD NAME="instructorchoiceacceptgrades" TYPE="int" LENGTH="1" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Accept grades from tool" PREVIOUS="instructorcustomparameters" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="Grade scale" PREVIOUS="instructorchoiceacceptgrades" NEXT="launchcontainer"/>
-        <FIELD NAME="launchcontainer" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="Launch external tool in a pop-up" PREVIOUS="grade" NEXT="resourcekey"/>
+        <FIELD NAME="instructorchoiceacceptgrades" TYPE="int" LENGTH="1" NOTNULL="false" SEQUENCE="false" COMMENT="Accept grades from tool" PREVIOUS="instructorcustomparameters" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" DECIMALS="5" COMMENT="Grade scale" PREVIOUS="instructorchoiceacceptgrades" NEXT="launchcontainer"/>
+        <FIELD NAME="launchcontainer" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Launch external tool in a pop-up" PREVIOUS="grade" NEXT="resourcekey"/>
         <FIELD NAME="resourcekey" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="launchcontainer" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="resourcekey" NEXT="debuglaunch"/>
-        <FIELD NAME="debuglaunch" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Enable the debug-style launch which pauses before auto-submit" PREVIOUS="password" NEXT="showtitlelaunch"/>
-        <FIELD NAME="showtitlelaunch" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="debuglaunch" NEXT="showdescriptionlaunch"/>
-        <FIELD NAME="showdescriptionlaunch" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showtitlelaunch" NEXT="servicesalt"/>
+        <FIELD NAME="debuglaunch" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Enable the debug-style launch which pauses before auto-submit" PREVIOUS="password" NEXT="showtitlelaunch"/>
+        <FIELD NAME="showtitlelaunch" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="debuglaunch" NEXT="showdescriptionlaunch"/>
+        <FIELD NAME="showdescriptionlaunch" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showtitlelaunch" NEXT="servicesalt"/>
         <FIELD NAME="servicesalt" TYPE="char" LENGTH="40" NOTNULL="false" SEQUENCE="false" PREVIOUS="showdescriptionlaunch" NEXT="icon"/>
         <FIELD NAME="icon" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="servicesalt" NEXT="secureicon"/>
         <FIELD NAME="secureicon" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="icon"/>
@@ -42,16 +42,16 @@
     </TABLE>
     <TABLE NAME="lti_types" COMMENT="Basic LTI pre-configured activities" PREVIOUS="lti" NEXT="lti_types_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="basiclti Activity" SEQUENCE="false" COMMENT="Activity name" PREVIOUS="id" NEXT="baseurl"/>
         <FIELD NAME="baseurl" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="tooldomain"/>
         <FIELD NAME="tooldomain" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="baseurl" NEXT="state"/>
-        <FIELD NAME="state" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="2" SEQUENCE="false" COMMENT="Active = 1, Pending = 2, Rejected = 3" PREVIOUS="tooldomain" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="state" NEXT="coursevisible"/>
-        <FIELD NAME="coursevisible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="createdby"/>
-        <FIELD NAME="createdby" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="coursevisible" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="createdby" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timecreated"/>
+        <FIELD NAME="state" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="2" SEQUENCE="false" COMMENT="Active = 1, Pending = 2, Rejected = 3" PREVIOUS="tooldomain" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="state" NEXT="coursevisible"/>
+        <FIELD NAME="coursevisible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="createdby"/>
+        <FIELD NAME="createdby" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="coursevisible" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="createdby" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -63,8 +63,8 @@
     </TABLE>
     <TABLE NAME="lti_types_config" COMMENT="Basic LTI types configuration" PREVIOUS="lti_types" NEXT="lti_submission">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="typeid"/>
-        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Basic LTI type id" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="typeid"/>
+        <FIELD NAME="typeid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Basic LTI type id" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" COMMENT="Basic LTI param" PREVIOUS="typeid" NEXT="value"/>
         <FIELD NAME="value" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Param value" PREVIOUS="name"/>
       </FIELDS>
@@ -77,15 +77,15 @@
     </TABLE>
     <TABLE NAME="lti_submission" COMMENT="Keeps track of individual submissions for LTI activities." PREVIOUS="lti_types_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="ltiid"/>
-        <FIELD NAME="ltiid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of the LTI tool instance" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="ltiid" NEXT="datesubmitted"/>
-        <FIELD NAME="datesubmitted" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="userid" NEXT="dateupdated"/>
-        <FIELD NAME="dateupdated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="datesubmitted" NEXT="gradepercent"/>
-        <FIELD NAME="gradepercent" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="dateupdated" NEXT="originalgrade"/>
-        <FIELD NAME="originalgrade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="gradepercent" NEXT="launchid"/>
-        <FIELD NAME="launchid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="originalgrade" NEXT="state"/>
-        <FIELD NAME="state" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="launchid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="ltiid"/>
+        <FIELD NAME="ltiid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of the LTI tool instance" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="ltiid" NEXT="datesubmitted"/>
+        <FIELD NAME="datesubmitted" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="dateupdated"/>
+        <FIELD NAME="dateupdated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="datesubmitted" NEXT="gradepercent"/>
+        <FIELD NAME="gradepercent" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" PREVIOUS="dateupdated" NEXT="originalgrade"/>
+        <FIELD NAME="originalgrade" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" PREVIOUS="gradepercent" NEXT="launchid"/>
+        <FIELD NAME="launchid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="originalgrade" NEXT="state"/>
+        <FIELD NAME="state" TYPE="int" LENGTH="2" NOTNULL="true" SEQUENCE="false" PREVIOUS="launchid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/page/db/install.xml b/mod/page/db/install.xml
index 14ee007e6c5ed..d63595f9bc921 100644
--- a/mod/page/db/install.xml
+++ b/mod/page/db/install.xml
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/page/db" VERSION="20090722" COMMENT="XMLDB file for Page module"
+<XMLDB PATH="mod/page/db" VERSION="20120122" COMMENT="XMLDB file for Page module"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="page" COMMENT="Each record is one page and its config data">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="content"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" PREVIOUS="introformat" NEXT="contentformat"/>
-        <FIELD NAME="contentformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="content" NEXT="legacyfiles"/>
-        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contentformat" NEXT="legacyfileslast"/>
-        <FIELD NAME="legacyfileslast" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfileslast" NEXT="displayoptions"/>
+        <FIELD NAME="contentformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="content" NEXT="legacyfiles"/>
+        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="contentformat" NEXT="legacyfileslast"/>
+        <FIELD NAME="legacyfileslast" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfileslast" NEXT="displayoptions"/>
         <FIELD NAME="displayoptions" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="display" NEXT="revision"/>
-        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="displayoptions" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
+        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="displayoptions" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/quiz/db/install.xml b/mod/quiz/db/install.xml
index 7eb850dc74ba1..682a58b447222 100644
--- a/mod/quiz/db/install.xml
+++ b/mod/quiz/db/install.xml
@@ -1,47 +1,47 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/quiz/db" VERSION="20110512" COMMENT="XMLDB file for Moodle mod/quiz"
+<XMLDB PATH="mod/quiz/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/quiz"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="quiz" COMMENT="Main information about each quiz" NEXT="quiz_attempts">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="timeopen"/>
-        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timeclose"/>
-        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="preferredbehaviour"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="timeopen"/>
+        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timeclose"/>
+        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="preferredbehaviour"/>
         <FIELD NAME="preferredbehaviour" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="timeclose" NEXT="attempts"/>
-        <FIELD NAME="attempts" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="preferredbehaviour" NEXT="attemptonlast"/>
-        <FIELD NAME="attemptonlast" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="attempts" NEXT="grademethod"/>
-        <FIELD NAME="grademethod" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="attemptonlast" NEXT="decimalpoints"/>
-        <FIELD NAME="decimalpoints" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="2" SEQUENCE="false" PREVIOUS="grademethod" NEXT="questiondecimalpoints"/>
-        <FIELD NAME="questiondecimalpoints" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="-2" SEQUENCE="false" PREVIOUS="decimalpoints" NEXT="reviewattempt"/>
-        <FIELD NAME="reviewattempt" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. This is a bit field, decoded by the mod_quiz_display_options class. It is formed by ORing together the constants defined there." PREVIOUS="questiondecimalpoints" NEXT="reviewcorrectness"/>
-        <FIELD NAME="reviewcorrectness" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewattempt" NEXT="reviewmarks"/>
-        <FIELD NAME="reviewmarks" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewcorrectness" NEXT="reviewspecificfeedback"/>
-        <FIELD NAME="reviewspecificfeedback" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewmarks" NEXT="reviewgeneralfeedback"/>
-        <FIELD NAME="reviewgeneralfeedback" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewspecificfeedback" NEXT="reviewrightanswer"/>
-        <FIELD NAME="reviewrightanswer" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewgeneralfeedback" NEXT="reviewoverallfeedback"/>
-        <FIELD NAME="reviewoverallfeedback" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewrightanswer" NEXT="questionsperpage"/>
-        <FIELD NAME="questionsperpage" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="reviewoverallfeedback" NEXT="shufflequestions"/>
-        <FIELD NAME="shufflequestions" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="questionsperpage" NEXT="shuffleanswers"/>
-        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="shufflequestions" NEXT="questions"/>
+        <FIELD NAME="attempts" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="preferredbehaviour" NEXT="attemptonlast"/>
+        <FIELD NAME="attemptonlast" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attempts" NEXT="grademethod"/>
+        <FIELD NAME="grademethod" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="attemptonlast" NEXT="decimalpoints"/>
+        <FIELD NAME="decimalpoints" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="grademethod" NEXT="questiondecimalpoints"/>
+        <FIELD NAME="questiondecimalpoints" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="-2" SEQUENCE="false" PREVIOUS="decimalpoints" NEXT="reviewattempt"/>
+        <FIELD NAME="reviewattempt" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. This is a bit field, decoded by the mod_quiz_display_options class. It is formed by ORing together the constants defined there." PREVIOUS="questiondecimalpoints" NEXT="reviewcorrectness"/>
+        <FIELD NAME="reviewcorrectness" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewattempt" NEXT="reviewmarks"/>
+        <FIELD NAME="reviewmarks" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewcorrectness" NEXT="reviewspecificfeedback"/>
+        <FIELD NAME="reviewspecificfeedback" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewmarks" NEXT="reviewgeneralfeedback"/>
+        <FIELD NAME="reviewgeneralfeedback" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewspecificfeedback" NEXT="reviewrightanswer"/>
+        <FIELD NAME="reviewrightanswer" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewgeneralfeedback" NEXT="reviewoverallfeedback"/>
+        <FIELD NAME="reviewoverallfeedback" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether users are allowed to review their quiz attempts at various times. A bit field, like reviewattempt." PREVIOUS="reviewrightanswer" NEXT="questionsperpage"/>
+        <FIELD NAME="questionsperpage" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="reviewoverallfeedback" NEXT="shufflequestions"/>
+        <FIELD NAME="shufflequestions" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="questionsperpage" NEXT="shuffleanswers"/>
+        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="shufflequestions" NEXT="questions"/>
         <FIELD NAME="questions" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="shuffleanswers" NEXT="sumgrades"/>
-        <FIELD NAME="sumgrades" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" PREVIOUS="questions" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" PREVIOUS="sumgrades" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="timelimit"/>
-        <FIELD NAME="timelimit" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="password"/>
+        <FIELD NAME="sumgrades" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" PREVIOUS="questions" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" PREVIOUS="sumgrades" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="timelimit"/>
+        <FIELD NAME="timelimit" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timemodified" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="timelimit" NEXT="subnet"/>
         <FIELD NAME="subnet" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="password" NEXT="browsersecurity"/>
         <FIELD NAME="browsersecurity" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="subnet" NEXT="delay1"/>
-        <FIELD NAME="delay1" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="browsersecurity" NEXT="delay2"/>
-        <FIELD NAME="delay2" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="delay1" NEXT="showuserpicture"/>
-        <FIELD NAME="showuserpicture" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Option to show the user's picture during the attempt and on the review page." PREVIOUS="delay2" NEXT="showblocks"/>
-        <FIELD NAME="showblocks" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Whether blocks should be shown on the attempt.php and review.php pages." PREVIOUS="showuserpicture"/>
+        <FIELD NAME="delay1" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="browsersecurity" NEXT="delay2"/>
+        <FIELD NAME="delay2" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="delay1" NEXT="showuserpicture"/>
+        <FIELD NAME="showuserpicture" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Option to show the user's picture during the attempt and on the review page." PREVIOUS="delay2" NEXT="showblocks"/>
+        <FIELD NAME="showblocks" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether blocks should be shown on the attempt.php and review.php pages." PREVIOUS="showuserpicture"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -52,19 +52,19 @@
     </TABLE>
     <TABLE NAME="quiz_attempts" COMMENT="Stores various attempts on a quiz" PREVIOUS="quiz" NEXT="quiz_grades">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="uniqueid"/>
-        <FIELD NAME="uniqueid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="quiz"/>
-        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="uniqueid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="quiz" NEXT="attempt"/>
-        <FIELD NAME="attempt" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="sumgrades"/>
-        <FIELD NAME="sumgrades" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="attempt" NEXT="timestart"/>
-        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sumgrades" NEXT="timefinish"/>
-        <FIELD NAME="timefinish" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timefinish" NEXT="layout"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="uniqueid"/>
+        <FIELD NAME="uniqueid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="quiz"/>
+        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="uniqueid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="quiz" NEXT="attempt"/>
+        <FIELD NAME="attempt" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="sumgrades"/>
+        <FIELD NAME="sumgrades" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="attempt" NEXT="timestart"/>
+        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sumgrades" NEXT="timefinish"/>
+        <FIELD NAME="timefinish" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timestart" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timefinish" NEXT="layout"/>
         <FIELD NAME="layout" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="currentpage"/>
-        <FIELD NAME="currentpage" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="layout" NEXT="preview"/>
-        <FIELD NAME="preview" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="currentpage" NEXT="needsupgradetonewqe"/>
-        <FIELD NAME="needsupgradetonewqe" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="preview"/>
+        <FIELD NAME="currentpage" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="layout" NEXT="preview"/>
+        <FIELD NAME="preview" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="currentpage" NEXT="needsupgradetonewqe"/>
+        <FIELD NAME="needsupgradetonewqe" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="preview"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="uniqueid"/>
@@ -77,11 +77,11 @@
     </TABLE>
     <TABLE NAME="quiz_grades" COMMENT="The overall grade for each user on the quiz, based on their individual and the quiz.grademethod setting." PREVIOUS="quiz_attempts" NEXT="quiz_question_instances">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quiz"/>
-        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references user.id." PREVIOUS="quiz" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The overall grade from the quiz. Not affected by overrides in the gradebook." PREVIOUS="userid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The last time this grade changed." PREVIOUS="grade"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quiz"/>
+        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references user.id." PREVIOUS="quiz" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The overall grade from the quiz. Not affected by overrides in the gradebook." PREVIOUS="userid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The last time this grade changed." PREVIOUS="grade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="quiz"/>
@@ -93,10 +93,10 @@
     </TABLE>
     <TABLE NAME="quiz_question_instances" COMMENT="Stores the maximum possible grade (weight) for each question used in a quiz." PREVIOUS="quiz_grades" NEXT="quiz_feedback">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quiz"/>
-        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="quiz" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="7" COMMENT="How many marks this question contributes to quiz.sumgrades." PREVIOUS="question"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quiz"/>
+        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="quiz" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="7" COMMENT="How many marks this question contributes to quiz.sumgrades." PREVIOUS="question"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="quiz"/>
@@ -106,12 +106,12 @@
     </TABLE>
     <TABLE NAME="quiz_feedback" COMMENT="Feedback given to students based on which grade band their overall score lies." PREVIOUS="quiz_question_instances" NEXT="quiz_overrides">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quizid"/>
-        <FIELD NAME="quizid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="feedbacktext"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quizid"/>
+        <FIELD NAME="quizid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id." PREVIOUS="id" NEXT="feedbacktext"/>
         <FIELD NAME="feedbacktext" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="The feedback to show for a attempt where mingrade &lt;= attempt grade &lt; maxgrade. See function quiz_feedback_for_grade in mod/quiz/locallib.php." PREVIOUS="quizid" NEXT="feedbacktextformat"/>
-        <FIELD NAME="feedbacktextformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbacktext" NEXT="mingrade"/>
-        <FIELD NAME="mingrade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The lower limit of this grade band. Inclusive." PREVIOUS="feedbacktextformat" NEXT="maxgrade"/>
-        <FIELD NAME="maxgrade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The upper limit of this grade band. Exclusive." PREVIOUS="mingrade"/>
+        <FIELD NAME="feedbacktextformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbacktext" NEXT="mingrade"/>
+        <FIELD NAME="mingrade" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The lower limit of this grade band. Inclusive." PREVIOUS="feedbacktextformat" NEXT="maxgrade"/>
+        <FIELD NAME="maxgrade" TYPE="number" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" DECIMALS="5" COMMENT="The upper limit of this grade band. Exclusive." PREVIOUS="mingrade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="quizid"/>
@@ -120,14 +120,14 @@
     </TABLE>
     <TABLE NAME="quiz_overrides" COMMENT="The overrides to quiz settings on a per-user and per-group basis." PREVIOUS="quiz_feedback" NEXT="quiz_reports">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quiz"/>
-        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key references groups.id.  Can be null if this is a per-user override." PREVIOUS="quiz" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key references user.id.  Can be null if this is a per-group override." PREVIOUS="groupid" NEXT="timeopen"/>
-        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Time at which students may start attempting this quiz. Can be null, in which case the quiz default is used." PREVIOUS="userid" NEXT="timeclose"/>
-        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Time by which students must have completed their attempt.  Can be null, in which case the quiz default is used." PREVIOUS="timeopen" NEXT="timelimit"/>
-        <FIELD NAME="timelimit" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="Time limit in seconds.  Can be null, in which case the quiz default is used." PREVIOUS="timeclose" NEXT="attempts"/>
-        <FIELD NAME="attempts" TYPE="int" LENGTH="6" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timelimit" NEXT="password"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quiz"/>
+        <FIELD NAME="quiz" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references quiz.id" PREVIOUS="id" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Foreign key references groups.id.  Can be null if this is a per-user override." PREVIOUS="quiz" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Foreign key references user.id.  Can be null if this is a per-group override." PREVIOUS="groupid" NEXT="timeopen"/>
+        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Time at which students may start attempting this quiz. Can be null, in which case the quiz default is used." PREVIOUS="userid" NEXT="timeclose"/>
+        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Time by which students must have completed their attempt.  Can be null, in which case the quiz default is used." PREVIOUS="timeopen" NEXT="timelimit"/>
+        <FIELD NAME="timelimit" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="Time limit in seconds.  Can be null, in which case the quiz default is used." PREVIOUS="timeclose" NEXT="attempts"/>
+        <FIELD NAME="attempts" TYPE="int" LENGTH="6" NOTNULL="false" SEQUENCE="false" PREVIOUS="timelimit" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Quiz password.  Can be null, in which case the quiz default is used." PREVIOUS="attempts"/>
       </FIELDS>
       <KEYS>
@@ -139,9 +139,9 @@
     </TABLE>
     <TABLE NAME="quiz_reports" COMMENT="Lists all the installed quiz reports and their display order and so on. No need to worry about deleting old records. Only records with an equivalent directory are displayed." PREVIOUS="quiz_overrides">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="name of the report, same as the directory name" PREVIOUS="id" NEXT="displayorder"/>
-        <FIELD NAME="displayorder" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="display order for report tabs" PREVIOUS="name" NEXT="capability"/>
+        <FIELD NAME="displayorder" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="display order for report tabs" PREVIOUS="name" NEXT="capability"/>
         <FIELD NAME="capability" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Capability required to see this report. May be blank which means use the default of mod/quiz:viewreport. This is used when deciding which tabs to render." PREVIOUS="displayorder"/>
       </FIELDS>
       <KEYS>
diff --git a/mod/quiz/report/overview/db/install.xml b/mod/quiz/report/overview/db/install.xml
index b077072a807fe..2a648769c0130 100644
--- a/mod/quiz/report/overview/db/install.xml
+++ b/mod/quiz/report/overview/db/install.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/quiz/report/overview/db" VERSION="20090305" COMMENT="XMLDB file for Moodle mod/quiz/report/overview"
+<XMLDB PATH="mod/quiz/report/overview/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/quiz/report/overview"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="quiz_overview_regrades" COMMENT="This table records which question attempts need regrading and the grade they will be regraded to.">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="questionusageid"/>
-        <FIELD NAME="questionusageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key references question_usages.id, or equivalently quiz_attempt.uniqueid." PREVIOUS="id" NEXT="slot"/>
-        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempts.slot" PREVIOUS="questionusageid" NEXT="newfraction"/>
-        <FIELD NAME="newfraction" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="The new fraction for this question_attempt after regrading." PREVIOUS="slot" NEXT="oldfraction"/>
-        <FIELD NAME="oldfraction" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="The previous fraction for this question_attempt." PREVIOUS="newfraction" NEXT="regraded"/>
-        <FIELD NAME="regraded" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="set to 0 if element has just been regraded. Set to 1 if element has been marked as needing regrading." PREVIOUS="oldfraction" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Timestamp of when this row was last modified." PREVIOUS="regraded"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="questionusageid"/>
+        <FIELD NAME="questionusageid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key references question_usages.id, or equivalently quiz_attempt.uniqueid." PREVIOUS="id" NEXT="slot"/>
+        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key, references question_attempts.slot" PREVIOUS="questionusageid" NEXT="newfraction"/>
+        <FIELD NAME="newfraction" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="The new fraction for this question_attempt after regrading." PREVIOUS="slot" NEXT="oldfraction"/>
+        <FIELD NAME="oldfraction" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="The previous fraction for this question_attempt." PREVIOUS="newfraction" NEXT="regraded"/>
+        <FIELD NAME="regraded" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="set to 0 if element has just been regraded. Set to 1 if element has been marked as needing regrading." PREVIOUS="oldfraction" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Timestamp of when this row was last modified." PREVIOUS="regraded"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/quiz/report/statistics/db/install.xml b/mod/quiz/report/statistics/db/install.xml
index fc95b19aa8737..76f28a5885c85 100644
--- a/mod/quiz/report/statistics/db/install.xml
+++ b/mod/quiz/report/statistics/db/install.xml
@@ -1,27 +1,27 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/quiz/report/statistics/db" VERSION="20081118" COMMENT="XMLDB file for Moodle mod/quiz/report/statistics"
+<XMLDB PATH="mod/quiz/report/statistics/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/quiz/report/statistics"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="quiz_statistics" COMMENT="table to cache results from analysis done in statistics report for quizzes." NEXT="quiz_question_statistics">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quizid"/>
-        <FIELD NAME="quizid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="quizid" NEXT="allattempts"/>
-        <FIELD NAME="allattempts" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="bool used to indicate whether these stats are for all attempts or just for the first." PREVIOUS="groupid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="allattempts" NEXT="firstattemptscount"/>
-        <FIELD NAME="firstattemptscount" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="allattemptscount"/>
-        <FIELD NAME="allattemptscount" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="firstattemptscount" NEXT="firstattemptsavg"/>
-        <FIELD NAME="firstattemptsavg" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="allattemptscount" NEXT="allattemptsavg"/>
-        <FIELD NAME="allattemptsavg" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="firstattemptsavg" NEXT="median"/>
-        <FIELD NAME="median" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="allattemptsavg" NEXT="standarddeviation"/>
-        <FIELD NAME="standarddeviation" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="median" NEXT="skewness"/>
-        <FIELD NAME="skewness" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="standarddeviation" NEXT="kurtosis"/>
-        <FIELD NAME="kurtosis" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="skewness" NEXT="cic"/>
-        <FIELD NAME="cic" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="kurtosis" NEXT="errorratio"/>
-        <FIELD NAME="errorratio" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="cic" NEXT="standarderror"/>
-        <FIELD NAME="standarderror" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="errorratio"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quizid"/>
+        <FIELD NAME="quizid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="quizid" NEXT="allattempts"/>
+        <FIELD NAME="allattempts" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" COMMENT="bool used to indicate whether these stats are for all attempts or just for the first." PREVIOUS="groupid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="allattempts" NEXT="firstattemptscount"/>
+        <FIELD NAME="firstattemptscount" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="allattemptscount"/>
+        <FIELD NAME="allattemptscount" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="firstattemptscount" NEXT="firstattemptsavg"/>
+        <FIELD NAME="firstattemptsavg" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="allattemptscount" NEXT="allattemptsavg"/>
+        <FIELD NAME="allattemptsavg" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="firstattemptsavg" NEXT="median"/>
+        <FIELD NAME="median" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="allattemptsavg" NEXT="standarddeviation"/>
+        <FIELD NAME="standarddeviation" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="median" NEXT="skewness"/>
+        <FIELD NAME="skewness" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="standarddeviation" NEXT="kurtosis"/>
+        <FIELD NAME="kurtosis" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="skewness" NEXT="cic"/>
+        <FIELD NAME="cic" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="kurtosis" NEXT="errorratio"/>
+        <FIELD NAME="errorratio" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="cic" NEXT="standarderror"/>
+        <FIELD NAME="standarderror" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="errorratio"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -29,22 +29,22 @@
     </TABLE>
     <TABLE NAME="quiz_question_statistics" COMMENT="Default comment for the table, please edit me" PREVIOUS="quiz_statistics" NEXT="quiz_question_response_stats">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quizstatisticsid"/>
-        <FIELD NAME="quizstatisticsid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="quizstatisticsid" NEXT="slot"/>
-        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The position in the quiz where this question appears" PREVIOUS="questionid" NEXT="subquestion"/>
-        <FIELD NAME="subquestion" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="slot" NEXT="s"/>
-        <FIELD NAME="s" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="subquestion" NEXT="effectiveweight"/>
-        <FIELD NAME="effectiveweight" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="s" NEXT="negcovar"/>
-        <FIELD NAME="negcovar" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="effectiveweight" NEXT="discriminationindex"/>
-        <FIELD NAME="discriminationindex" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="negcovar" NEXT="discriminativeefficiency"/>
-        <FIELD NAME="discriminativeefficiency" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="discriminationindex" NEXT="sd"/>
-        <FIELD NAME="sd" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="discriminativeefficiency" NEXT="facility"/>
-        <FIELD NAME="facility" TYPE="number" LENGTH="15" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="sd" NEXT="subquestions"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quizstatisticsid"/>
+        <FIELD NAME="quizstatisticsid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="quizstatisticsid" NEXT="slot"/>
+        <FIELD NAME="slot" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The position in the quiz where this question appears" PREVIOUS="questionid" NEXT="subquestion"/>
+        <FIELD NAME="subquestion" TYPE="int" LENGTH="4" NOTNULL="true" SEQUENCE="false" PREVIOUS="slot" NEXT="s"/>
+        <FIELD NAME="s" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="subquestion" NEXT="effectiveweight"/>
+        <FIELD NAME="effectiveweight" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="s" NEXT="negcovar"/>
+        <FIELD NAME="negcovar" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="effectiveweight" NEXT="discriminationindex"/>
+        <FIELD NAME="discriminationindex" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="negcovar" NEXT="discriminativeefficiency"/>
+        <FIELD NAME="discriminativeefficiency" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="discriminationindex" NEXT="sd"/>
+        <FIELD NAME="sd" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="discriminativeefficiency" NEXT="facility"/>
+        <FIELD NAME="facility" TYPE="number" LENGTH="15" NOTNULL="false" SEQUENCE="false" DECIMALS="10" PREVIOUS="sd" NEXT="subquestions"/>
         <FIELD NAME="subquestions" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" PREVIOUS="facility" NEXT="maxmark"/>
-        <FIELD NAME="maxmark" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" PREVIOUS="subquestions" NEXT="positions"/>
+        <FIELD NAME="maxmark" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" PREVIOUS="subquestions" NEXT="positions"/>
         <FIELD NAME="positions" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="positions in which this item appears. Only used for random questions." PREVIOUS="maxmark" NEXT="randomguessscore"/>
-        <FIELD NAME="randomguessscore" TYPE="number" LENGTH="12" NOTNULL="false" UNSIGNED="false" SEQUENCE="false" DECIMALS="7" COMMENT="An estimate of the score a student would get by guessing randomly." PREVIOUS="positions"/>
+        <FIELD NAME="randomguessscore" TYPE="number" LENGTH="12" NOTNULL="false" SEQUENCE="false" DECIMALS="7" COMMENT="An estimate of the score a student would get by guessing randomly." PREVIOUS="positions"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -52,14 +52,14 @@
     </TABLE>
     <TABLE NAME="quiz_question_response_stats" COMMENT="Quiz question responses." PREVIOUS="quiz_question_statistics">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="quizstatisticsid"/>
-        <FIELD NAME="quizstatisticsid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="quizstatisticsid" NEXT="subqid"/>
-        <FIELD NAME="subqid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="questionid" NEXT="aid"/>
-        <FIELD NAME="aid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="subqid" NEXT="response"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="quizstatisticsid"/>
+        <FIELD NAME="quizstatisticsid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="questionid"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="quizstatisticsid" NEXT="subqid"/>
+        <FIELD NAME="subqid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="questionid" NEXT="aid"/>
+        <FIELD NAME="aid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="subqid" NEXT="response"/>
         <FIELD NAME="response" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" PREVIOUS="aid" NEXT="rcount"/>
-        <FIELD NAME="rcount" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="response" NEXT="credit"/>
-        <FIELD NAME="credit" TYPE="number" LENGTH="15" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" DECIMALS="5" PREVIOUS="rcount"/>
+        <FIELD NAME="rcount" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="response" NEXT="credit"/>
+        <FIELD NAME="credit" TYPE="number" LENGTH="15" NOTNULL="true" SEQUENCE="false" DECIMALS="5" PREVIOUS="rcount"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/resource/db/install.xml b/mod/resource/db/install.xml
index 99d3a3116e323..ed1dd8bf3f84d 100644
--- a/mod/resource/db/install.xml
+++ b/mod/resource/db/install.xml
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/resource/db" VERSION="20100527" COMMENT="XMLDB file for Resource module"
+<XMLDB PATH="mod/resource/db" VERSION="20120122" COMMENT="XMLDB file for Resource module"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="resource" COMMENT="Each record is one resource and its config data" NEXT="resource_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="tobemigrated"/>
-        <FIELD NAME="tobemigrated" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="legacyfiles"/>
-        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="tobemigrated" NEXT="legacyfileslast"/>
-        <FIELD NAME="legacyfileslast" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfileslast" NEXT="displayoptions"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="tobemigrated"/>
+        <FIELD NAME="tobemigrated" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="legacyfiles"/>
+        <FIELD NAME="legacyfiles" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="tobemigrated" NEXT="legacyfileslast"/>
+        <FIELD NAME="legacyfileslast" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="legacyfiles" NEXT="display"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="legacyfileslast" NEXT="displayoptions"/>
         <FIELD NAME="displayoptions" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="display" NEXT="filterfiles"/>
-        <FIELD NAME="filterfiles" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayoptions" NEXT="revision"/>
-        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="filterfiles" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
+        <FIELD NAME="filterfiles" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="displayoptions" NEXT="revision"/>
+        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="incremented when after each file changes, solves browser caching issues" PREVIOUS="filterfiles" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -29,22 +29,22 @@
     </TABLE>
     <TABLE NAME="resource_old" COMMENT="backup of all old resource instances from 1.9" PREVIOUS="resource">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="type"/>
         <FIELD NAME="type" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="reference"/>
         <FIELD NAME="reference" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="type" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="reference" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="alltext"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="alltext"/>
         <FIELD NAME="alltext" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" PREVIOUS="introformat" NEXT="popup"/>
         <FIELD NAME="popup" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="alltext" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="popup" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="options" NEXT="oldid"/>
-        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="cmid"/>
-        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="oldid" NEXT="newmodule"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="options" NEXT="oldid"/>
+        <FIELD NAME="oldid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="cmid"/>
+        <FIELD NAME="cmid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="oldid" NEXT="newmodule"/>
         <FIELD NAME="newmodule" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" PREVIOUS="cmid" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newmodule" NEXT="migrated"/>
-        <FIELD NAME="migrated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newid"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newmodule" NEXT="migrated"/>
+        <FIELD NAME="migrated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="newid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/scorm/db/install.xml b/mod/scorm/db/install.xml
index fefbb5fc786c0..11666791ba34a 100644
--- a/mod/scorm/db/install.xml
+++ b/mod/scorm/db/install.xml
@@ -1,45 +1,45 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/scorm/db" VERSION="20111105" COMMENT="XMLDB file for Moodle mod/scorm"
+<XMLDB PATH="mod/scorm/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/scorm"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="scorm" COMMENT="each table is one SCORM module and its configuration" NEXT="scorm_scoes">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="scormtype"/>
         <FIELD NAME="scormtype" TYPE="char" LENGTH="50" NOTNULL="true" DEFAULT="local" SEQUENCE="false" COMMENT="local, external or repository" PREVIOUS="name" NEXT="reference"/>
         <FIELD NAME="reference" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="scormtype" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="reference" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="version"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="version"/>
         <FIELD NAME="version" TYPE="char" LENGTH="9" NOTNULL="true" SEQUENCE="false" PREVIOUS="introformat" NEXT="maxgrade"/>
-        <FIELD NAME="maxgrade" TYPE="float" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="grademethod"/>
-        <FIELD NAME="grademethod" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxgrade" NEXT="whatgrade"/>
-        <FIELD NAME="whatgrade" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="grademethod" NEXT="maxattempt"/>
-        <FIELD NAME="maxattempt" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="whatgrade" NEXT="forcecompleted"/>
-        <FIELD NAME="forcecompleted" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="maxattempt" NEXT="forcenewattempt"/>
-        <FIELD NAME="forcenewattempt" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="forcecompleted" NEXT="lastattemptlock"/>
-        <FIELD NAME="lastattemptlock" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="forcenewattempt" NEXT="displayattemptstatus"/>
-        <FIELD NAME="displayattemptstatus" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="lastattemptlock" NEXT="displaycoursestructure"/>
-        <FIELD NAME="displaycoursestructure" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="displayattemptstatus" NEXT="updatefreq"/>
-        <FIELD NAME="updatefreq" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Define when the package must be automatically update" PREVIOUS="displaycoursestructure" NEXT="sha1hash"/>
+        <FIELD NAME="maxgrade" TYPE="float" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="version" NEXT="grademethod"/>
+        <FIELD NAME="grademethod" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxgrade" NEXT="whatgrade"/>
+        <FIELD NAME="whatgrade" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grademethod" NEXT="maxattempt"/>
+        <FIELD NAME="maxattempt" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="whatgrade" NEXT="forcecompleted"/>
+        <FIELD NAME="forcecompleted" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="maxattempt" NEXT="forcenewattempt"/>
+        <FIELD NAME="forcenewattempt" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="forcecompleted" NEXT="lastattemptlock"/>
+        <FIELD NAME="lastattemptlock" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="forcenewattempt" NEXT="displayattemptstatus"/>
+        <FIELD NAME="displayattemptstatus" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="lastattemptlock" NEXT="displaycoursestructure"/>
+        <FIELD NAME="displaycoursestructure" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="displayattemptstatus" NEXT="updatefreq"/>
+        <FIELD NAME="updatefreq" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Define when the package must be automatically update" PREVIOUS="displaycoursestructure" NEXT="sha1hash"/>
         <FIELD NAME="sha1hash" TYPE="char" LENGTH="40" NOTNULL="false" SEQUENCE="false" COMMENT="package content or ext path hash" PREVIOUS="updatefreq" NEXT="md5hash"/>
         <FIELD NAME="md5hash" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" COMMENT="MD5 Hash of package file" PREVIOUS="sha1hash" NEXT="revision"/>
-        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="revison number" PREVIOUS="md5hash" NEXT="launch"/>
-        <FIELD NAME="launch" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision" NEXT="skipview"/>
-        <FIELD NAME="skipview" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="launch" NEXT="hidebrowse"/>
-        <FIELD NAME="hidebrowse" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="skipview" NEXT="hidetoc"/>
-        <FIELD NAME="hidetoc" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidebrowse" NEXT="hidenav"/>
-        <FIELD NAME="hidenav" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidetoc" NEXT="auto"/>
-        <FIELD NAME="auto" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidenav" NEXT="popup"/>
-        <FIELD NAME="popup" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="auto" NEXT="options"/>
+        <FIELD NAME="revision" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="revison number" PREVIOUS="md5hash" NEXT="launch"/>
+        <FIELD NAME="launch" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="revision" NEXT="skipview"/>
+        <FIELD NAME="skipview" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="launch" NEXT="hidebrowse"/>
+        <FIELD NAME="hidebrowse" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="skipview" NEXT="hidetoc"/>
+        <FIELD NAME="hidetoc" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidebrowse" NEXT="hidenav"/>
+        <FIELD NAME="hidenav" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidetoc" NEXT="auto"/>
+        <FIELD NAME="auto" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidenav" NEXT="popup"/>
+        <FIELD NAME="popup" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="auto" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="popup" NEXT="width"/>
-        <FIELD NAME="width" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="100" SEQUENCE="false" PREVIOUS="options" NEXT="height"/>
-        <FIELD NAME="height" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="600" SEQUENCE="false" PREVIOUS="width" NEXT="timeopen"/>
-        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="height" NEXT="timeclose"/>
-        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose"/>
+        <FIELD NAME="width" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" PREVIOUS="options" NEXT="height"/>
+        <FIELD NAME="height" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="600" SEQUENCE="false" PREVIOUS="width" NEXT="timeopen"/>
+        <FIELD NAME="timeopen" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="height" NEXT="timeclose"/>
+        <FIELD NAME="timeclose" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeopen" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeclose"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -50,8 +50,8 @@
     </TABLE>
     <TABLE NAME="scorm_scoes" COMMENT="each SCO part of the SCORM module" PREVIOUS="scorm" NEXT="scorm_scoes_data">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scorm"/>
-        <FIELD NAME="scorm" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="manifest"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scorm"/>
+        <FIELD NAME="scorm" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="manifest"/>
         <FIELD NAME="manifest" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="scorm" NEXT="organization"/>
         <FIELD NAME="organization" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="manifest" NEXT="parent"/>
         <FIELD NAME="parent" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="organization" NEXT="identifier"/>
@@ -67,8 +67,8 @@
     </TABLE>
     <TABLE NAME="scorm_scoes_data" COMMENT="Contains variable data get from packages" PREVIOUS="scorm_scoes" NEXT="scorm_scoes_track">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="scoid" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name"/>
       </FIELDS>
@@ -79,14 +79,14 @@
     </TABLE>
     <TABLE NAME="scorm_scoes_track" COMMENT="to track SCOes" PREVIOUS="scorm_scoes_data" NEXT="scorm_seq_objective">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="scormid"/>
-        <FIELD NAME="scormid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scormid" NEXT="attempt"/>
-        <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="scoid" NEXT="element"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="scormid"/>
+        <FIELD NAME="scormid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scormid" NEXT="attempt"/>
+        <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="scoid" NEXT="element"/>
         <FIELD NAME="element" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="attempt" NEXT="value"/>
         <FIELD NAME="value" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false" PREVIOUS="element" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="value"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="value"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="scormid"/>
@@ -101,12 +101,12 @@
     </TABLE>
     <TABLE NAME="scorm_seq_objective" COMMENT="SCORM2004 objective description" PREVIOUS="scorm_scoes_track" NEXT="scorm_seq_mapinfo">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="primaryobj"/>
-        <FIELD NAME="primaryobj" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="objectiveid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="primaryobj"/>
+        <FIELD NAME="primaryobj" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="objectiveid"/>
         <FIELD NAME="objectiveid" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="primaryobj" NEXT="satisfiedbymeasure"/>
-        <FIELD NAME="satisfiedbymeasure" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="objectiveid" NEXT="minnormalizedmeasure"/>
-        <FIELD NAME="minnormalizedmeasure" TYPE="float" LENGTH="11" NOTNULL="true" UNSIGNED="true" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="satisfiedbymeasure"/>
+        <FIELD NAME="satisfiedbymeasure" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="objectiveid" NEXT="minnormalizedmeasure"/>
+        <FIELD NAME="minnormalizedmeasure" TYPE="float" LENGTH="11" NOTNULL="true" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="satisfiedbymeasure"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="scorm_objective_uniq"/>
@@ -116,14 +116,14 @@
     </TABLE>
     <TABLE NAME="scorm_seq_mapinfo" COMMENT="SCORM2004 objective mapinfo description" PREVIOUS="scorm_seq_objective" NEXT="scorm_seq_ruleconds">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="objectiveid"/>
-        <FIELD NAME="objectiveid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="targetobjectiveid"/>
-        <FIELD NAME="targetobjectiveid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="objectiveid" NEXT="readsatisfiedstatus"/>
-        <FIELD NAME="readsatisfiedstatus" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="targetobjectiveid" NEXT="readnormalizedmeasure"/>
-        <FIELD NAME="readnormalizedmeasure" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="readsatisfiedstatus" NEXT="writesatisfiedstatus"/>
-        <FIELD NAME="writesatisfiedstatus" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="readnormalizedmeasure" NEXT="writenormalizedmeasure"/>
-        <FIELD NAME="writenormalizedmeasure" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="writesatisfiedstatus"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="objectiveid"/>
+        <FIELD NAME="objectiveid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="targetobjectiveid"/>
+        <FIELD NAME="targetobjectiveid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="objectiveid" NEXT="readsatisfiedstatus"/>
+        <FIELD NAME="readsatisfiedstatus" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="targetobjectiveid" NEXT="readnormalizedmeasure"/>
+        <FIELD NAME="readnormalizedmeasure" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="readsatisfiedstatus" NEXT="writesatisfiedstatus"/>
+        <FIELD NAME="writesatisfiedstatus" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="readnormalizedmeasure" NEXT="writenormalizedmeasure"/>
+        <FIELD NAME="writenormalizedmeasure" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="writesatisfiedstatus"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="scorm_mapinfo_uniq"/>
@@ -134,10 +134,10 @@
     </TABLE>
     <TABLE NAME="scorm_seq_ruleconds" COMMENT="SCORM2004 rule conditions" PREVIOUS="scorm_seq_mapinfo" NEXT="scorm_seq_rulecond">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="conditioncombination"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="conditioncombination"/>
         <FIELD NAME="conditioncombination" TYPE="char" LENGTH="3" NOTNULL="true" DEFAULT="all" SEQUENCE="false" PREVIOUS="scoid" NEXT="ruletype"/>
-        <FIELD NAME="ruletype" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="conditioncombination" NEXT="action"/>
+        <FIELD NAME="ruletype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="conditioncombination" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="25" NOTNULL="true" SEQUENCE="false" PREVIOUS="ruletype"/>
       </FIELDS>
       <KEYS>
@@ -148,11 +148,11 @@
     </TABLE>
     <TABLE NAME="scorm_seq_rulecond" COMMENT="SCORM2004 rule condition" PREVIOUS="scorm_seq_ruleconds" NEXT="scorm_seq_rolluprule">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="ruleconditionsid"/>
-        <FIELD NAME="ruleconditionsid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="refrencedobjective"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="ruleconditionsid"/>
+        <FIELD NAME="ruleconditionsid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="refrencedobjective"/>
         <FIELD NAME="refrencedobjective" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="ruleconditionsid" NEXT="measurethreshold"/>
-        <FIELD NAME="measurethreshold" TYPE="float" LENGTH="11" NOTNULL="true" UNSIGNED="false" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="refrencedobjective" NEXT="operator"/>
+        <FIELD NAME="measurethreshold" TYPE="float" LENGTH="11" NOTNULL="true" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="refrencedobjective" NEXT="operator"/>
         <FIELD NAME="operator" TYPE="char" LENGTH="5" NOTNULL="true" DEFAULT="noOp" SEQUENCE="false" PREVIOUS="measurethreshold" NEXT="cond"/>
         <FIELD NAME="cond" TYPE="char" LENGTH="30" NOTNULL="true" DEFAULT="always" SEQUENCE="false" PREVIOUS="operator"/>
       </FIELDS>
@@ -165,11 +165,11 @@
     </TABLE>
     <TABLE NAME="scorm_seq_rolluprule" COMMENT="SCORM2004 sequencing rule" PREVIOUS="scorm_seq_rulecond" NEXT="scorm_seq_rolluprulecond">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="childactivityset"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="childactivityset"/>
         <FIELD NAME="childactivityset" TYPE="char" LENGTH="15" NOTNULL="true" SEQUENCE="false" PREVIOUS="scoid" NEXT="minimumcount"/>
-        <FIELD NAME="minimumcount" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="childactivityset" NEXT="minimumpercent"/>
-        <FIELD NAME="minimumpercent" TYPE="float" LENGTH="11" NOTNULL="true" UNSIGNED="true" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="minimumcount" NEXT="conditioncombination"/>
+        <FIELD NAME="minimumcount" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="childactivityset" NEXT="minimumpercent"/>
+        <FIELD NAME="minimumpercent" TYPE="float" LENGTH="11" NOTNULL="true" DEFAULT="0.0000" SEQUENCE="false" DECIMALS="4" PREVIOUS="minimumcount" NEXT="conditioncombination"/>
         <FIELD NAME="conditioncombination" TYPE="char" LENGTH="3" NOTNULL="true" DEFAULT="all" SEQUENCE="false" PREVIOUS="minimumpercent" NEXT="action"/>
         <FIELD NAME="action" TYPE="char" LENGTH="15" NOTNULL="true" SEQUENCE="false" PREVIOUS="conditioncombination"/>
       </FIELDS>
@@ -181,9 +181,9 @@
     </TABLE>
     <TABLE NAME="scorm_seq_rolluprulecond" COMMENT="SCORM2004 sequencing rule" PREVIOUS="scorm_seq_rolluprule" NEXT="scorm_aicc_session">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="scoid"/>
-        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="rollupruleid"/>
-        <FIELD NAME="rollupruleid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="operator"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="scoid"/>
+        <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="rollupruleid"/>
+        <FIELD NAME="rollupruleid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="scoid" NEXT="operator"/>
         <FIELD NAME="operator" TYPE="char" LENGTH="5" NOTNULL="true" DEFAULT="noOp" SEQUENCE="false" PREVIOUS="rollupruleid" NEXT="cond"/>
         <FIELD NAME="cond" TYPE="char" LENGTH="25" NOTNULL="true" SEQUENCE="false" PREVIOUS="operator"/>
       </FIELDS>
@@ -196,18 +196,18 @@
     </TABLE>
       <TABLE NAME="scorm_aicc_session" COMMENT="Used by AICC HACP to store session information" PREVIOUS="scorm_seq_rolluprulecond">
         <FIELDS>
-          <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-          <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from user table" PREVIOUS="id" NEXT="scormid"/>
-          <FIELD NAME="scormid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from scorm table" PREVIOUS="userid" NEXT="hacpsession"/>
+          <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+          <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from user table" PREVIOUS="id" NEXT="scormid"/>
+          <FIELD NAME="scormid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from scorm table" PREVIOUS="userid" NEXT="hacpsession"/>
           <FIELD NAME="hacpsession" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="sessionid used to authenticate AICC HACP communication" PREVIOUS="scormid" NEXT="scoid"/>
-          <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="id from scorm_scoes table" PREVIOUS="hacpsession" NEXT="scormmode"/>
+          <FIELD NAME="scoid" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="id from scorm_scoes table" PREVIOUS="hacpsession" NEXT="scormmode"/>
           <FIELD NAME="scormmode" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" PREVIOUS="scoid" NEXT="scormstatus"/>
           <FIELD NAME="scormstatus" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="scormmode" NEXT="attempt"/>
-          <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="scormstatus" NEXT="lessonstatus"/>
+          <FIELD NAME="attempt" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="scormstatus" NEXT="lessonstatus"/>
           <FIELD NAME="lessonstatus" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="attempt" NEXT="sessiontime"/>
           <FIELD NAME="sessiontime" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="lessonstatus" NEXT="timecreated"/>
-          <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="time this session was created" PREVIOUS="sessiontime" NEXT="timemodified"/>
-          <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="time this session was last used" PREVIOUS="timecreated"/>
+          <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="time this session was created" PREVIOUS="sessiontime" NEXT="timemodified"/>
+          <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="time this session was last used" PREVIOUS="timecreated"/>
         </FIELDS>
         <KEYS>
           <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="scormid"/>
diff --git a/mod/survey/db/install.xml b/mod/survey/db/install.xml
index 051a13c3af365..cbdcce2dff050 100644
--- a/mod/survey/db/install.xml
+++ b/mod/survey/db/install.xml
@@ -1,20 +1,20 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/survey/db" VERSION="20090420" COMMENT="XMLDB file for Moodle mod/survey"
+<XMLDB PATH="mod/survey/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/survey"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="survey" COMMENT="Each record is one SURVEY module with its configuration" NEXT="survey_questions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="template"/>
-        <FIELD NAME="template" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="days"/>
-        <FIELD NAME="days" TYPE="int" LENGTH="6" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="template" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="days" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="template"/>
+        <FIELD NAME="template" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="course" NEXT="days"/>
+        <FIELD NAME="days" TYPE="int" LENGTH="6" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="template" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="days" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="intro text field format" PREVIOUS="intro" NEXT="questions"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="intro text field format" PREVIOUS="intro" NEXT="questions"/>
         <FIELD NAME="questions" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="introformat"/>
       </FIELDS>
       <KEYS>
@@ -26,12 +26,12 @@
     </TABLE>
     <TABLE NAME="survey_questions" COMMENT="the questions conforming one survey" PREVIOUS="survey" NEXT="survey_answers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="text"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="text"/>
         <FIELD NAME="text" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="shorttext"/>
         <FIELD NAME="shorttext" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="text" NEXT="multi"/>
         <FIELD NAME="multi" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="shorttext" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" PREVIOUS="multi" NEXT="type"/>
-        <FIELD NAME="type" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="options"/>
+        <FIELD NAME="type" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="options"/>
         <FIELD NAME="options" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="type"/>
       </FIELDS>
       <KEYS>
@@ -40,11 +40,11 @@
     </TABLE>
     <TABLE NAME="survey_answers" COMMENT="the answers to each questions filled by the users" PREVIOUS="survey_questions" NEXT="survey_analysis">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="survey"/>
-        <FIELD NAME="survey" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="survey" NEXT="time"/>
-        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="answer1"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="survey"/>
+        <FIELD NAME="survey" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="survey" NEXT="time"/>
+        <FIELD NAME="time" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="answer1"/>
         <FIELD NAME="answer1" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="time" NEXT="answer2"/>
         <FIELD NAME="answer2" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="answer1"/>
       </FIELDS>
@@ -59,9 +59,9 @@
     </TABLE>
     <TABLE NAME="survey_analysis" COMMENT="text about each survey submission" PREVIOUS="survey_answers">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="survey"/>
-        <FIELD NAME="survey" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="survey" NEXT="notes"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="survey"/>
+        <FIELD NAME="survey" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="survey" NEXT="notes"/>
         <FIELD NAME="notes" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
diff --git a/mod/url/db/install.xml b/mod/url/db/install.xml
index d042027dd7c98..71e6265269539 100644
--- a/mod/url/db/install.xml
+++ b/mod/url/db/install.xml
@@ -1,21 +1,21 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/url/db" VERSION="20090722" COMMENT="XMLDB file for URL module"
+<XMLDB PATH="mod/url/db" VERSION="20120122" COMMENT="XMLDB file for URL module"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="url" COMMENT="each record is one url resource">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="externalurl"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="intro" NEXT="externalurl"/>
         <FIELD NAME="externalurl" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="introformat" NEXT="display"/>
-        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="externalurl" NEXT="displayoptions"/>
+        <FIELD NAME="display" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="externalurl" NEXT="displayoptions"/>
         <FIELD NAME="displayoptions" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="display" NEXT="parameters"/>
         <FIELD NAME="parameters" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="displayoptions" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parameters"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="parameters"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/wiki/db/install.xml b/mod/wiki/db/install.xml
index 608dcb6085866..22bae9ecd2aa6 100644
--- a/mod/wiki/db/install.xml
+++ b/mod/wiki/db/install.xml
@@ -1,24 +1,24 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/wiki/db" VERSION="20101025" COMMENT="XMLDB file for Moodle mod/wiki"
+<XMLDB PATH="mod/wiki/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/wiki"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="wiki" COMMENT="Stores Wiki activity configuration" NEXT="wiki_subwikis">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Course wiki activity belongs to" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Course wiki activity belongs to" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="Wiki" SEQUENCE="false" COMMENT="name field for moodle instances" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="medium" NOTNULL="false" SEQUENCE="false" COMMENT="General introduction of the wiki activity" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the intro field (MOODLE, HTML, MARKDOWN...)" PREVIOUS="intro" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="firstpagetitle"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Format of the intro field (MOODLE, HTML, MARKDOWN...)" PREVIOUS="intro" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="introformat" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="firstpagetitle"/>
         <FIELD NAME="firstpagetitle" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="First Page" SEQUENCE="false" COMMENT="Wiki first page's name" PREVIOUS="timemodified" NEXT="wikimode"/>
         <FIELD NAME="wikimode" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="collaborative" SEQUENCE="false" COMMENT="Wiki mode (individual, collaborative)" PREVIOUS="firstpagetitle" NEXT="defaultformat"/>
         <FIELD NAME="defaultformat" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="creole" SEQUENCE="false" COMMENT="Wiki's default editor" PREVIOUS="wikimode" NEXT="forceformat"/>
-        <FIELD NAME="forceformat" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="Forces the default editor" PREVIOUS="defaultformat" NEXT="editbegin"/>
-        <FIELD NAME="editbegin" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="editbegin" PREVIOUS="forceformat" NEXT="editend"/>
-        <FIELD NAME="editend" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="editend" PREVIOUS="editbegin"/>
+        <FIELD NAME="forceformat" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Forces the default editor" PREVIOUS="defaultformat" NEXT="editbegin"/>
+        <FIELD NAME="editbegin" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="editbegin" PREVIOUS="forceformat" NEXT="editend"/>
+        <FIELD NAME="editend" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="editend" PREVIOUS="editbegin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -29,10 +29,10 @@
     </TABLE>
     <TABLE NAME="wiki_subwikis" COMMENT="Stores subwiki instances" PREVIOUS="wiki" NEXT="wiki_pages">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="wikiid"/>
-        <FIELD NAME="wikiid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki activity" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Group that owns this wiki" PREVIOUS="wikiid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Owner of that subwiki" PREVIOUS="groupid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="wikiid"/>
+        <FIELD NAME="wikiid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki activity" PREVIOUS="id" NEXT="groupid"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Group that owns this wiki" PREVIOUS="wikiid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Owner of that subwiki" PREVIOUS="groupid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="wikifk"/>
@@ -42,16 +42,16 @@
     </TABLE>
     <TABLE NAME="wiki_pages" COMMENT="Stores wiki pages" PREVIOUS="wiki_subwikis" NEXT="wiki_versions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="subwikiid"/>
-        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance of this page" PREVIOUS="id" NEXT="title"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="subwikiid"/>
+        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance of this page" PREVIOUS="id" NEXT="title"/>
         <FIELD NAME="title" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="title" SEQUENCE="false" COMMENT="Page name" PREVIOUS="subwikiid" NEXT="cachedcontent"/>
         <FIELD NAME="cachedcontent" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" COMMENT="Cache wiki content" PREVIOUS="title" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki page creation timestamp" PREVIOUS="cachedcontent" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="page edition timestamp" PREVIOUS="timecreated" NEXT="timerendered"/>
-        <FIELD NAME="timerendered" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Last render timestamp" PREVIOUS="timemodified" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Edition author" PREVIOUS="timerendered" NEXT="pageviews"/>
-        <FIELD NAME="pageviews" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Number of page views" PREVIOUS="userid" NEXT="readonly"/>
-        <FIELD NAME="readonly" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Read only flag" PREVIOUS="pageviews"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki page creation timestamp" PREVIOUS="cachedcontent" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="page edition timestamp" PREVIOUS="timecreated" NEXT="timerendered"/>
+        <FIELD NAME="timerendered" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Last render timestamp" PREVIOUS="timemodified" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Edition author" PREVIOUS="timerendered" NEXT="pageviews"/>
+        <FIELD NAME="pageviews" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Number of page views" PREVIOUS="userid" NEXT="readonly"/>
+        <FIELD NAME="readonly" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Read only flag" PREVIOUS="pageviews"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="subwikititleuser"/>
@@ -61,13 +61,13 @@
     </TABLE>
     <TABLE NAME="wiki_versions" COMMENT="Stores wiki page history" PREVIOUS="wiki_pages" NEXT="wiki_synonyms">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id" PREVIOUS="id" NEXT="content"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id" PREVIOUS="id" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="medium" NOTNULL="true" SEQUENCE="false" COMMENT="Not parsed wiki content" PREVIOUS="pageid" NEXT="contentformat"/>
         <FIELD NAME="contentformat" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="creole" SEQUENCE="false" COMMENT="Markup used to write content" PREVIOUS="content" NEXT="version"/>
-        <FIELD NAME="version" TYPE="int" LENGTH="5" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki page version" PREVIOUS="contentformat" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page edition timestamp" PREVIOUS="version" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Edition autor" PREVIOUS="timecreated"/>
+        <FIELD NAME="version" TYPE="int" LENGTH="5" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Wiki page version" PREVIOUS="contentformat" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page edition timestamp" PREVIOUS="version" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Edition autor" PREVIOUS="timecreated"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="pagefk"/>
@@ -76,9 +76,9 @@
     </TABLE>
     <TABLE NAME="wiki_synonyms" COMMENT="Stores wiki pages synonyms" PREVIOUS="wiki_versions" NEXT="wiki_links">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="subwikiid"/>
-        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance" PREVIOUS="id" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Original page" PREVIOUS="subwikiid" NEXT="pagesynonym"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="subwikiid"/>
+        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance" PREVIOUS="id" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Original page" PREVIOUS="subwikiid" NEXT="pagesynonym"/>
         <FIELD NAME="pagesynonym" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="Pagesynonym" SEQUENCE="false" COMMENT="Page name synonym" PREVIOUS="pageid"/>
       </FIELDS>
       <KEYS>
@@ -88,10 +88,10 @@
     </TABLE>
     <TABLE NAME="wiki_links" COMMENT="Page wiki links" PREVIOUS="wiki_synonyms" NEXT="wiki_locks">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="subwikiid"/>
-        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance" PREVIOUS="id" NEXT="frompageid"/>
-        <FIELD NAME="frompageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id with a link" PREVIOUS="subwikiid" NEXT="topageid"/>
-        <FIELD NAME="topageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id that recives a link" PREVIOUS="frompageid" NEXT="tomissingpage"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="subwikiid"/>
+        <FIELD NAME="subwikiid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Subwiki instance" PREVIOUS="id" NEXT="frompageid"/>
+        <FIELD NAME="frompageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id with a link" PREVIOUS="subwikiid" NEXT="topageid"/>
+        <FIELD NAME="topageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Page id that recives a link" PREVIOUS="frompageid" NEXT="tomissingpage"/>
         <FIELD NAME="tomissingpage" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="link to a nonexistent page" PREVIOUS="topageid"/>
       </FIELDS>
       <KEYS>
@@ -102,11 +102,11 @@
     </TABLE>
     <TABLE NAME="wiki_locks" COMMENT="Manages page locks" PREVIOUS="wiki_links">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="pageid"/>
-        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Locked page" PREVIOUS="id" NEXT="sectionname"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="pageid"/>
+        <FIELD NAME="pageid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Locked page" PREVIOUS="id" NEXT="sectionname"/>
         <FIELD NAME="sectionname" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="locked page section" PREVIOUS="pageid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Locking user" PREVIOUS="sectionname" NEXT="lockedat"/>
-        <FIELD NAME="lockedat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="timestamp" PREVIOUS="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Locking user" PREVIOUS="sectionname" NEXT="lockedat"/>
+        <FIELD NAME="lockedat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="timestamp" PREVIOUS="userid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
diff --git a/mod/workshop/db/install.xml b/mod/workshop/db/install.xml
index afc44e29f4e20..76e0050f90041 100644
--- a/mod/workshop/db/install.xml
+++ b/mod/workshop/db/install.xml
@@ -1,38 +1,38 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/db" VERSION="20101112" COMMENT="XMLDB file for Moodle mod/workshop"
+<XMLDB PATH="mod/workshop/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/workshop"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshop" COMMENT="This table keeps information about the module instances and their settings" NEXT="workshop_submissions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="ID of the parent course" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="ID of the parent course" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Name of the activity" PREVIOUS="course" NEXT="intro"/>
         <FIELD NAME="intro" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The introduction or description of the activity" PREVIOUS="name" NEXT="introformat"/>
-        <FIELD NAME="introformat" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the intro field" PREVIOUS="intro" NEXT="instructauthors"/>
+        <FIELD NAME="introformat" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the intro field" PREVIOUS="intro" NEXT="instructauthors"/>
         <FIELD NAME="instructauthors" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Instructions for the submission phase" PREVIOUS="introformat" NEXT="instructauthorsformat"/>
-        <FIELD NAME="instructauthorsformat" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instructauthors" NEXT="instructreviewers"/>
+        <FIELD NAME="instructauthorsformat" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instructauthors" NEXT="instructreviewers"/>
         <FIELD NAME="instructreviewers" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Instructions for the assessment phase" PREVIOUS="instructauthorsformat" NEXT="instructreviewersformat"/>
-        <FIELD NAME="instructreviewersformat" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instructreviewers" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp when the module was modified" PREVIOUS="instructreviewersformat" NEXT="phase"/>
-        <FIELD NAME="phase" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The current phase of workshop (0 = not available, 1 = submission, 2 = assessment, 3 = closed)" PREVIOUS="timemodified" NEXT="useexamples"/>
-        <FIELD NAME="useexamples" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students practise evaluating on example submissions from teacher" PREVIOUS="phase" NEXT="usepeerassessment"/>
-        <FIELD NAME="usepeerassessment" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students perform peer assessment of others' work" PREVIOUS="useexamples" NEXT="useselfassessment"/>
-        <FIELD NAME="useselfassessment" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students perform self assessment of their own work" PREVIOUS="usepeerassessment" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="80" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum grade for submission" PREVIOUS="useselfassessment" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="20" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum grade for assessment" PREVIOUS="grade" NEXT="strategy"/>
+        <FIELD NAME="instructreviewersformat" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="instructreviewers" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The timestamp when the module was modified" PREVIOUS="instructreviewersformat" NEXT="phase"/>
+        <FIELD NAME="phase" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The current phase of workshop (0 = not available, 1 = submission, 2 = assessment, 3 = closed)" PREVIOUS="timemodified" NEXT="useexamples"/>
+        <FIELD NAME="useexamples" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students practise evaluating on example submissions from teacher" PREVIOUS="phase" NEXT="usepeerassessment"/>
+        <FIELD NAME="usepeerassessment" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students perform peer assessment of others' work" PREVIOUS="useexamples" NEXT="useselfassessment"/>
+        <FIELD NAME="useselfassessment" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="optional feature: students perform self assessment of their own work" PREVIOUS="usepeerassessment" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" DEFAULT="80" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum grade for submission" PREVIOUS="useselfassessment" NEXT="gradinggrade"/>
+        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" DEFAULT="20" SEQUENCE="false" DECIMALS="5" COMMENT="The maximum grade for assessment" PREVIOUS="grade" NEXT="strategy"/>
         <FIELD NAME="strategy" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" COMMENT="The type of the current grading strategy used in this workshop" PREVIOUS="gradinggrade" NEXT="evaluation"/>
         <FIELD NAME="evaluation" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" COMMENT="The recently used grading evaluation method" PREVIOUS="strategy" NEXT="gradedecimals"/>
-        <FIELD NAME="gradedecimals" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Number of digits that should be shown after the decimal point when displaying grades" PREVIOUS="evaluation" NEXT="nattachments"/>
-        <FIELD NAME="nattachments" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Number of required submission attachments" PREVIOUS="gradedecimals" NEXT="latesubmissions"/>
-        <FIELD NAME="latesubmissions" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Allow submitting the work after the deadline" PREVIOUS="nattachments" NEXT="maxbytes"/>
-        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="100000" SEQUENCE="false" COMMENT="Maximum size of the one attached file" PREVIOUS="latesubmissions" NEXT="examplesmode"/>
-        <FIELD NAME="examplesmode" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 = example assessments are voluntary, 1 = examples must be assessed before submission, 2 = examples are available after own submission and must be assessed before peer/self assessment phase" PREVIOUS="maxbytes" NEXT="submissionstart"/>
-        <FIELD NAME="submissionstart" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be started manually, greater than 0 the timestamp of the start of the submission phase" PREVIOUS="examplesmode" NEXT="submissionend"/>
-        <FIELD NAME="submissionend" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be closed manually, greater than 0 the timestamp of the end of the submission phase" PREVIOUS="submissionstart" NEXT="assessmentstart"/>
-        <FIELD NAME="assessmentstart" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be started manually, greater than 0 the timestamp of the start of the assessment phase" PREVIOUS="submissionend" NEXT="assessmentend"/>
-        <FIELD NAME="assessmentend" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be closed manually, greater than 0 the timestamp of the end of the assessment phase" PREVIOUS="assessmentstart"/>
+        <FIELD NAME="gradedecimals" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Number of digits that should be shown after the decimal point when displaying grades" PREVIOUS="evaluation" NEXT="nattachments"/>
+        <FIELD NAME="nattachments" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Number of required submission attachments" PREVIOUS="gradedecimals" NEXT="latesubmissions"/>
+        <FIELD NAME="latesubmissions" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Allow submitting the work after the deadline" PREVIOUS="nattachments" NEXT="maxbytes"/>
+        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="100000" SEQUENCE="false" COMMENT="Maximum size of the one attached file" PREVIOUS="latesubmissions" NEXT="examplesmode"/>
+        <FIELD NAME="examplesmode" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="0 = example assessments are voluntary, 1 = examples must be assessed before submission, 2 = examples are available after own submission and must be assessed before peer/self assessment phase" PREVIOUS="maxbytes" NEXT="submissionstart"/>
+        <FIELD NAME="submissionstart" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be started manually, greater than 0 the timestamp of the start of the submission phase" PREVIOUS="examplesmode" NEXT="submissionend"/>
+        <FIELD NAME="submissionend" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be closed manually, greater than 0 the timestamp of the end of the submission phase" PREVIOUS="submissionstart" NEXT="assessmentstart"/>
+        <FIELD NAME="assessmentstart" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be started manually, greater than 0 the timestamp of the start of the assessment phase" PREVIOUS="submissionend" NEXT="assessmentend"/>
+        <FIELD NAME="assessmentend" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="0 = will be closed manually, greater than 0 the timestamp of the end of the assessment phase" PREVIOUS="assessmentstart"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="course_fk"/>
@@ -41,25 +41,25 @@
     </TABLE>
     <TABLE NAME="workshop_submissions" COMMENT="Info about the submission and the aggregation of the grade for submission, grade for assessment and final grade. Both grade for submission and grade for assessment can be overridden by teacher. Final grade is always the sum of them. All grades are stored as of 0-100." PREVIOUS="workshop" NEXT="workshop_assessments">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="the id of the workshop instance" PREVIOUS="id" NEXT="example"/>
-        <FIELD NAME="example" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Is this submission an example from teacher" PREVIOUS="workshopid" NEXT="authorid"/>
-        <FIELD NAME="authorid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The author of the submission" PREVIOUS="example" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Timestamp when the work was submitted for the first time" PREVIOUS="authorid" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Timestamp when the submission has been updated" PREVIOUS="timecreated" NEXT="title"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="the id of the workshop instance" PREVIOUS="id" NEXT="example"/>
+        <FIELD NAME="example" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Is this submission an example from teacher" PREVIOUS="workshopid" NEXT="authorid"/>
+        <FIELD NAME="authorid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The author of the submission" PREVIOUS="example" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Timestamp when the work was submitted for the first time" PREVIOUS="authorid" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Timestamp when the submission has been updated" PREVIOUS="timecreated" NEXT="title"/>
         <FIELD NAME="title" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="The submission title" PREVIOUS="timemodified" NEXT="content"/>
         <FIELD NAME="content" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Submission text" PREVIOUS="title" NEXT="contentformat"/>
-        <FIELD NAME="contentformat" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of submission text" PREVIOUS="content" NEXT="contenttrust"/>
-        <FIELD NAME="contenttrust" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The trust mode of the data" PREVIOUS="contentformat" NEXT="attachment"/>
-        <FIELD NAME="attachment" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Used by File API file_postupdate_standard_filemanager" PREVIOUS="contenttrust" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregated grade for the submission. The grade is a decimal number from interval 0..100. If NULL then the grade for submission has not been aggregated yet." PREVIOUS="attachment" NEXT="gradeover"/>
-        <FIELD NAME="gradeover" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Grade for the submission manually overridden by a teacher. Grade is always from interval 0..100. If NULL then the grade is not overriden." PREVIOUS="grade" NEXT="gradeoverby"/>
-        <FIELD NAME="gradeoverby" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the user who has overridden the grade for submission." PREVIOUS="gradeover" NEXT="feedbackauthor"/>
+        <FIELD NAME="contentformat" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of submission text" PREVIOUS="content" NEXT="contenttrust"/>
+        <FIELD NAME="contenttrust" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The trust mode of the data" PREVIOUS="contentformat" NEXT="attachment"/>
+        <FIELD NAME="attachment" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Used by File API file_postupdate_standard_filemanager" PREVIOUS="contenttrust" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="Aggregated grade for the submission. The grade is a decimal number from interval 0..100. If NULL then the grade for submission has not been aggregated yet." PREVIOUS="attachment" NEXT="gradeover"/>
+        <FIELD NAME="gradeover" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="Grade for the submission manually overridden by a teacher. Grade is always from interval 0..100. If NULL then the grade is not overriden." PREVIOUS="grade" NEXT="gradeoverby"/>
+        <FIELD NAME="gradeoverby" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The id of the user who has overridden the grade for submission." PREVIOUS="gradeover" NEXT="feedbackauthor"/>
         <FIELD NAME="feedbackauthor" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Teacher comment/feedback for the author of the submission, for example describing the reasons for the grade overriding" PREVIOUS="gradeoverby" NEXT="feedbackauthorformat"/>
-        <FIELD NAME="feedbackauthorformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackauthor" NEXT="timegraded"/>
-        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp when grade or gradeover was recently modified" PREVIOUS="feedbackauthorformat" NEXT="published"/>
-        <FIELD NAME="published" TYPE="int" LENGTH="2" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Shall the submission be available to other when the workshop is closed" PREVIOUS="timegraded" NEXT="late"/>
-        <FIELD NAME="late" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Has this submission been submitted after the deadline or during the assessment phase?" PREVIOUS="published"/>
+        <FIELD NAME="feedbackauthorformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackauthor" NEXT="timegraded"/>
+        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The timestamp when grade or gradeover was recently modified" PREVIOUS="feedbackauthorformat" NEXT="published"/>
+        <FIELD NAME="published" TYPE="int" LENGTH="2" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Shall the submission be available to other when the workshop is closed" PREVIOUS="timegraded" NEXT="late"/>
+        <FIELD NAME="late" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Has this submission been submitted after the deadline or during the assessment phase?" PREVIOUS="published"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
@@ -70,20 +70,20 @@
     </TABLE>
     <TABLE NAME="workshop_assessments" COMMENT="Info about the made assessment and automatically calculated grade for it. The proposed grade can be overridden by teacher." PREVIOUS="workshop_submissions" NEXT="workshop_grades">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="submissionid"/>
-        <FIELD NAME="submissionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the assessed submission" PREVIOUS="id" NEXT="reviewerid"/>
-        <FIELD NAME="reviewerid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the reviewer who makes this assessment" PREVIOUS="submissionid" NEXT="weight"/>
-        <FIELD NAME="weight" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" COMMENT="The weight of the assessment for the purposes of aggregation" PREVIOUS="reviewerid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 then the assessment was allocated but the reviewer has not assessed yet. If greater than 0 then the timestamp of when the reviewer assessed for the first time" PREVIOUS="weight" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 then the assessment was allocated but the reviewer has not assessed yet. If greater than 0 then the timestamp of when the reviewer assessed for the last time" PREVIOUS="timecreated" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="The aggregated grade for submission suggested by the reviewer. The grade 0..100 is computed from the values assigned to the assessment dimensions fields. If NULL then it has not been aggregated yet." PREVIOUS="timemodified" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="The computed grade 0..100 for this assessment. If NULL then it has not been computed yet." PREVIOUS="grade" NEXT="gradinggradeover"/>
-        <FIELD NAME="gradinggradeover" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Grade for the assessment manually overridden by a teacher. Grade is always from interval 0..100. If NULL then the grade is not overriden." PREVIOUS="gradinggrade" NEXT="gradinggradeoverby"/>
-        <FIELD NAME="gradinggradeoverby" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the user who has overridden the grade for submission." PREVIOUS="gradinggradeover" NEXT="feedbackauthor"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="submissionid"/>
+        <FIELD NAME="submissionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the assessed submission" PREVIOUS="id" NEXT="reviewerid"/>
+        <FIELD NAME="reviewerid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the reviewer who makes this assessment" PREVIOUS="submissionid" NEXT="weight"/>
+        <FIELD NAME="weight" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="The weight of the assessment for the purposes of aggregation" PREVIOUS="reviewerid" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 then the assessment was allocated but the reviewer has not assessed yet. If greater than 0 then the timestamp of when the reviewer assessed for the first time" PREVIOUS="weight" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 then the assessment was allocated but the reviewer has not assessed yet. If greater than 0 then the timestamp of when the reviewer assessed for the last time" PREVIOUS="timecreated" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The aggregated grade for submission suggested by the reviewer. The grade 0..100 is computed from the values assigned to the assessment dimensions fields. If NULL then it has not been aggregated yet." PREVIOUS="timemodified" NEXT="gradinggrade"/>
+        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The computed grade 0..100 for this assessment. If NULL then it has not been computed yet." PREVIOUS="grade" NEXT="gradinggradeover"/>
+        <FIELD NAME="gradinggradeover" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="Grade for the assessment manually overridden by a teacher. Grade is always from interval 0..100. If NULL then the grade is not overriden." PREVIOUS="gradinggrade" NEXT="gradinggradeoverby"/>
+        <FIELD NAME="gradinggradeoverby" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The id of the user who has overridden the grade for submission." PREVIOUS="gradinggradeover" NEXT="feedbackauthor"/>
         <FIELD NAME="feedbackauthor" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The comment/feedback from the reviewer for the author." PREVIOUS="gradinggradeoverby" NEXT="feedbackauthorformat"/>
-        <FIELD NAME="feedbackauthorformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackauthor" NEXT="feedbackreviewer"/>
+        <FIELD NAME="feedbackauthorformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackauthor" NEXT="feedbackreviewer"/>
         <FIELD NAME="feedbackreviewer" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The comment/feedback from the teacher for the reviewer. For example the reason why the grade for assessment was overridden" PREVIOUS="feedbackauthorformat" NEXT="feedbackreviewerformat"/>
-        <FIELD NAME="feedbackreviewerformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackreviewer"/>
+        <FIELD NAME="feedbackreviewerformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedbackreviewer"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="submission_fk"/>
@@ -94,13 +94,13 @@
     </TABLE>
     <TABLE NAME="workshop_grades" COMMENT="How the reviewers filled-up the grading forms, given grades and comments" PREVIOUS="workshop_assessments" NEXT="workshop_aggregations">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="assessmentid"/>
-        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Part of which assessment this grade is of" PREVIOUS="id" NEXT="strategy"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="assessmentid"/>
+        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Part of which assessment this grade is of" PREVIOUS="id" NEXT="strategy"/>
         <FIELD NAME="strategy" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="assessmentid" NEXT="dimensionid"/>
-        <FIELD NAME="dimensionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key. References dimension id in one of the grading strategy tables." PREVIOUS="strategy" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Given grade in the referenced assessment dimension." PREVIOUS="dimensionid" NEXT="peercomment"/>
+        <FIELD NAME="dimensionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key. References dimension id in one of the grading strategy tables." PREVIOUS="strategy" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="Given grade in the referenced assessment dimension." PREVIOUS="dimensionid" NEXT="peercomment"/>
         <FIELD NAME="peercomment" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="Reviewer's comment to the grade value." PREVIOUS="grade" NEXT="peercommentformat"/>
-        <FIELD NAME="peercommentformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of peercomment field" PREVIOUS="peercomment"/>
+        <FIELD NAME="peercommentformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of peercomment field" PREVIOUS="peercomment"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="assessment_fk"/>
@@ -110,11 +110,11 @@
     </TABLE>
     <TABLE NAME="workshop_aggregations" COMMENT="Aggregated grades for assessment are stored here. The aggregated grade for submission is stored in workshop_submissions" PREVIOUS="workshop_grades" NEXT="workshop_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="the id of the workshop instance" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the user which aggregated grades are calculated for" PREVIOUS="workshopid" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="The aggregated grade for all assessments made by this reviewer. The grade is a number from interval 0..100. If NULL then the grade for assessments has not been aggregated yet." PREVIOUS="userid" NEXT="timegraded"/>
-        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" COMMENT="The timestamp of when the participant's gradinggrade was recently aggregated." PREVIOUS="gradinggrade"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="the id of the workshop instance" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the user which aggregated grades are calculated for" PREVIOUS="workshopid" NEXT="gradinggrade"/>
+        <FIELD NAME="gradinggrade" TYPE="number" LENGTH="10" NOTNULL="false" SEQUENCE="false" DECIMALS="5" COMMENT="The aggregated grade for all assessments made by this reviewer. The grade is a number from interval 0..100. If NULL then the grade for assessments has not been aggregated yet." PREVIOUS="userid" NEXT="timegraded"/>
+        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" COMMENT="The timestamp of when the participant's gradinggrade was recently aggregated." PREVIOUS="gradinggrade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
@@ -125,40 +125,40 @@
     </TABLE>
     <TABLE NAME="workshop_old" COMMENT="Legacy workshop table to be dropped later in Moodle 2.x" PREVIOUS="workshop_aggregations" NEXT="workshop_elements_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="course"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="course" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="name" NEXT="wtype"/>
-        <FIELD NAME="wtype" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="nelements"/>
-        <FIELD NAME="nelements" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="wtype" NEXT="nattachments"/>
-        <FIELD NAME="nattachments" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nelements" NEXT="phase"/>
-        <FIELD NAME="phase" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nattachments" NEXT="format"/>
-        <FIELD NAME="format" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="phase" NEXT="gradingstrategy"/>
-        <FIELD NAME="gradingstrategy" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="format" NEXT="resubmit"/>
-        <FIELD NAME="resubmit" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradingstrategy" NEXT="agreeassessments"/>
-        <FIELD NAME="agreeassessments" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmit" NEXT="hidegrades"/>
-        <FIELD NAME="hidegrades" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="agreeassessments" NEXT="anonymous"/>
-        <FIELD NAME="anonymous" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidegrades" NEXT="includeself"/>
-        <FIELD NAME="includeself" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="anonymous" NEXT="maxbytes"/>
-        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="100000" SEQUENCE="false" PREVIOUS="includeself" NEXT="submissionstart"/>
-        <FIELD NAME="submissionstart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxbytes" NEXT="assessmentstart"/>
-        <FIELD NAME="assessmentstart" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionstart" NEXT="submissionend"/>
-        <FIELD NAME="submissionend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentstart" NEXT="assessmentend"/>
-        <FIELD NAME="assessmentend" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionend" NEXT="releasegrades"/>
-        <FIELD NAME="releasegrades" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentend" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="releasegrades" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="ntassessments"/>
-        <FIELD NAME="ntassessments" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="assessmentcomps"/>
-        <FIELD NAME="assessmentcomps" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="ntassessments" NEXT="nsassessments"/>
-        <FIELD NAME="nsassessments" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentcomps" NEXT="overallocation"/>
-        <FIELD NAME="overallocation" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nsassessments" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="overallocation" NEXT="teacherweight"/>
-        <FIELD NAME="teacherweight" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="timemodified" NEXT="showleaguetable"/>
-        <FIELD NAME="showleaguetable" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacherweight" NEXT="usepassword"/>
-        <FIELD NAME="usepassword" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showleaguetable" NEXT="password"/>
+        <FIELD NAME="wtype" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="nelements"/>
+        <FIELD NAME="nelements" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="wtype" NEXT="nattachments"/>
+        <FIELD NAME="nattachments" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nelements" NEXT="phase"/>
+        <FIELD NAME="phase" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nattachments" NEXT="format"/>
+        <FIELD NAME="format" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="phase" NEXT="gradingstrategy"/>
+        <FIELD NAME="gradingstrategy" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="format" NEXT="resubmit"/>
+        <FIELD NAME="resubmit" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradingstrategy" NEXT="agreeassessments"/>
+        <FIELD NAME="agreeassessments" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmit" NEXT="hidegrades"/>
+        <FIELD NAME="hidegrades" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="agreeassessments" NEXT="anonymous"/>
+        <FIELD NAME="anonymous" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="hidegrades" NEXT="includeself"/>
+        <FIELD NAME="includeself" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="anonymous" NEXT="maxbytes"/>
+        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="100000" SEQUENCE="false" PREVIOUS="includeself" NEXT="submissionstart"/>
+        <FIELD NAME="submissionstart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="maxbytes" NEXT="assessmentstart"/>
+        <FIELD NAME="assessmentstart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionstart" NEXT="submissionend"/>
+        <FIELD NAME="submissionend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentstart" NEXT="assessmentend"/>
+        <FIELD NAME="assessmentend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionend" NEXT="releasegrades"/>
+        <FIELD NAME="releasegrades" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentend" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="releasegrades" NEXT="gradinggrade"/>
+        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="ntassessments"/>
+        <FIELD NAME="ntassessments" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="assessmentcomps"/>
+        <FIELD NAME="assessmentcomps" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="ntassessments" NEXT="nsassessments"/>
+        <FIELD NAME="nsassessments" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentcomps" NEXT="overallocation"/>
+        <FIELD NAME="overallocation" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="nsassessments" NEXT="timemodified"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="overallocation" NEXT="teacherweight"/>
+        <FIELD NAME="teacherweight" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="timemodified" NEXT="showleaguetable"/>
+        <FIELD NAME="showleaguetable" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teacherweight" NEXT="usepassword"/>
+        <FIELD NAME="usepassword" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="showleaguetable" NEXT="password"/>
         <FIELD NAME="password" TYPE="char" LENGTH="32" NOTNULL="true" SEQUENCE="false" PREVIOUS="usepassword" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="password" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -169,17 +169,17 @@
     </TABLE>
     <TABLE NAME="workshop_elements_old" COMMENT="Legacy workshop_elements table to be dropped later in Moodle 2.x" PREVIOUS="workshop_old" NEXT="workshop_rubrics_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
-        <FIELD NAME="elementno" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
+        <FIELD NAME="elementno" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="elementno" NEXT="scale"/>
-        <FIELD NAME="scale" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="maxscore"/>
-        <FIELD NAME="maxscore" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="scale" NEXT="weight"/>
-        <FIELD NAME="weight" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="11" SEQUENCE="false" PREVIOUS="maxscore" NEXT="stddev"/>
-        <FIELD NAME="stddev" TYPE="float" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="weight" NEXT="totalassessments"/>
-        <FIELD NAME="totalassessments" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="stddev" NEXT="newplugin"/>
+        <FIELD NAME="scale" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="maxscore"/>
+        <FIELD NAME="maxscore" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="scale" NEXT="weight"/>
+        <FIELD NAME="weight" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="11" SEQUENCE="false" PREVIOUS="maxscore" NEXT="stddev"/>
+        <FIELD NAME="stddev" TYPE="float" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="weight" NEXT="totalassessments"/>
+        <FIELD NAME="totalassessments" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="stddev" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="totalassessments" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -188,13 +188,13 @@
     </TABLE>
     <TABLE NAME="workshop_rubrics_old" COMMENT="Legacy workshop_rubrics table to be dropped later in Moodle 2.x" PREVIOUS="workshop_elements_old" NEXT="workshop_submissions_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
-        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="rubricno"/>
-        <FIELD NAME="rubricno" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="elementno" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
+        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="rubricno"/>
+        <FIELD NAME="rubricno" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="elementno" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="rubricno" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="description" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -203,19 +203,19 @@
     </TABLE>
     <TABLE NAME="workshop_submissions_old" COMMENT="Legacy workshop_submissions table to be dropped later in Moodle 2.x" PREVIOUS="workshop_rubrics_old" NEXT="workshop_assessments_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="title"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="title"/>
         <FIELD NAME="title" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false" PREVIOUS="userid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="title" NEXT="mailed"/>
-        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="description"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="title" NEXT="mailed"/>
+        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="mailed" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="finalgrade"/>
-        <FIELD NAME="finalgrade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="late"/>
-        <FIELD NAME="late" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="finalgrade" NEXT="nassessments"/>
-        <FIELD NAME="nassessments" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="late" NEXT="newplugin"/>
+        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="finalgrade"/>
+        <FIELD NAME="finalgrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="late"/>
+        <FIELD NAME="late" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="finalgrade" NEXT="nassessments"/>
+        <FIELD NAME="nassessments" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="late" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="nassessments" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -228,23 +228,23 @@
     </TABLE>
     <TABLE NAME="workshop_assessments_old" COMMENT="Legacy workshop_assessments table to be dropped later in Moodle 2.x" PREVIOUS="workshop_submissions_old" NEXT="workshop_grades_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="submissionid"/>
-        <FIELD NAME="submissionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timegraded"/>
-        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="timeagreed"/>
-        <FIELD NAME="timeagreed" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timegraded" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="float" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeagreed" NEXT="gradinggrade"/>
-        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="teachergraded"/>
-        <FIELD NAME="teachergraded" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="mailed"/>
-        <FIELD NAME="mailed" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teachergraded" NEXT="resubmission"/>
-        <FIELD NAME="resubmission" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mailed" NEXT="donotuse"/>
-        <FIELD NAME="donotuse" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmission" NEXT="generalcomment"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="submissionid"/>
+        <FIELD NAME="submissionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="submissionid" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="timegraded"/>
+        <FIELD NAME="timegraded" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="timeagreed"/>
+        <FIELD NAME="timeagreed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timegraded" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="float" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timeagreed" NEXT="gradinggrade"/>
+        <FIELD NAME="gradinggrade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="grade" NEXT="teachergraded"/>
+        <FIELD NAME="teachergraded" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="gradinggrade" NEXT="mailed"/>
+        <FIELD NAME="mailed" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="teachergraded" NEXT="resubmission"/>
+        <FIELD NAME="resubmission" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="mailed" NEXT="donotuse"/>
+        <FIELD NAME="donotuse" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="resubmission" NEXT="generalcomment"/>
         <FIELD NAME="generalcomment" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="donotuse" NEXT="teachercomment"/>
         <FIELD NAME="teachercomment" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" PREVIOUS="generalcomment" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="teachercomment" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -258,14 +258,14 @@
     </TABLE>
     <TABLE NAME="workshop_grades_old" COMMENT="Legacy workshop_grades table to be dropped later in Moodle 2.x" PREVIOUS="workshop_assessments_old" NEXT="workshop_stockcomments_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="assessmentid"/>
-        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="elementno"/>
-        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentid" NEXT="feedback"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="assessmentid"/>
+        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="elementno"/>
+        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentid" NEXT="feedback"/>
         <FIELD NAME="feedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="elementno" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="newplugin"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="feedback" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="grade" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -275,12 +275,12 @@
     </TABLE>
     <TABLE NAME="workshop_stockcomments_old" COMMENT="Legacy workshop_stockcomments table to be dropped later in Moodle 2.x" PREVIOUS="workshop_grades_old" NEXT="workshop_comments_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
-        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="comments"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="elementno"/>
+        <FIELD NAME="elementno" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="comments"/>
         <FIELD NAME="comments" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="elementno" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="comments" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
@@ -289,15 +289,15 @@
     </TABLE>
     <TABLE NAME="workshop_comments_old" COMMENT="Legacy workshop_comments table to be dropped later in Moodle 2.x" PREVIOUS="workshop_stockcomments_old">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="assessmentid"/>
-        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="userid"/>
-        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentid" NEXT="timecreated"/>
-        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="mailed"/>
-        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="comments"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="assessmentid"/>
+        <FIELD NAME="assessmentid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="workshopid" NEXT="userid"/>
+        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="assessmentid" NEXT="timecreated"/>
+        <FIELD NAME="timecreated" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="userid" NEXT="mailed"/>
+        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timecreated" NEXT="comments"/>
         <FIELD NAME="comments" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="mailed" NEXT="newplugin"/>
         <FIELD NAME="newplugin" TYPE="char" LENGTH="28" NOTNULL="false" SEQUENCE="false" PREVIOUS="comments" NEXT="newid"/>
-        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="newplugin"/>
+        <FIELD NAME="newid" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="newplugin"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshopid"/>
diff --git a/mod/workshop/eval/best/db/install.xml b/mod/workshop/eval/best/db/install.xml
index b0d6dcca7edf0..a7b8197b0eba9 100644
--- a/mod/workshop/eval/best/db/install.xml
+++ b/mod/workshop/eval/best/db/install.xml
@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/eval/best/db" VERSION="20091020" COMMENT="XMLDB file for Moodle mod/workshop/eval/best"
+<XMLDB PATH="mod/workshop/eval/best/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/workshop/eval/best"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshopeval_best_settings" COMMENT="Settings for the grading evaluation subplugin Comparison with the best assessment.">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" PREVIOUS="id" NEXT="comparison"/>
-        <FIELD NAME="comparison" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="5" SEQUENCE="false" COMMENT="Here we store the recently set factor of comparison of assessment in the given workshop. Reasonable values are from 1 to 10 or so. Default to 5." PREVIOUS="workshopid"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" PREVIOUS="id" NEXT="comparison"/>
+        <FIELD NAME="comparison" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="5" SEQUENCE="false" COMMENT="Here we store the recently set factor of comparison of assessment in the given workshop. Reasonable values are from 1 to 10 or so. Default to 5." PREVIOUS="workshopid"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="fkuq_workshop"/>
diff --git a/mod/workshop/form/accumulative/db/install.xml b/mod/workshop/form/accumulative/db/install.xml
index 075cf24521edf..a37e571faafce 100644
--- a/mod/workshop/form/accumulative/db/install.xml
+++ b/mod/workshop/form/accumulative/db/install.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/db" VERSION="20090908" COMMENT="XMLDB file for Moodle mod/workshop"
+<XMLDB PATH="mod/workshop/db" VERSION="20120122" COMMENT="XMLDB file for Moodle mod/workshop"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshopform_accumulative" COMMENT="The assessment dimensions definitions of Accumulative grading strategy forms">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
-        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
+        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The description of the dimension" PREVIOUS="sort" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" SEQUENCE="false" COMMENT="If greater than 0, then the value is maximum grade on a scale 0..grade. If lesser than 0, then its absolute value is the id of a record in scale table. If equals 0, then no grading is possible for this dimension, just commenting." PREVIOUS="descriptionformat" NEXT="weight"/>
-        <FIELD NAME="weight" TYPE="int" LENGTH="5" NOTNULL="false" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="The weigh of the dimension" PREVIOUS="grade"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="If greater than 0, then the value is maximum grade on a scale 0..grade. If lesser than 0, then its absolute value is the id of a record in scale table. If equals 0, then no grading is possible for this dimension, just commenting." PREVIOUS="descriptionformat" NEXT="weight"/>
+        <FIELD NAME="weight" TYPE="int" LENGTH="5" NOTNULL="false" DEFAULT="1" SEQUENCE="false" COMMENT="The weigh of the dimension" PREVIOUS="grade"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
diff --git a/mod/workshop/form/comments/db/install.xml b/mod/workshop/form/comments/db/install.xml
index 191ae1adfabb5..d83002e9ea6b5 100644
--- a/mod/workshop/form/comments/db/install.xml
+++ b/mod/workshop/form/comments/db/install.xml
@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/db" VERSION="20090908" COMMENT="XMLDB file for Moodle Comments grading strategy"
+<XMLDB PATH="mod/workshop/db" VERSION="20120122" COMMENT="XMLDB file for Moodle Comments grading strategy"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshopform_comments" COMMENT="The assessment dimensions definitions of Comments strategy forms">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
-        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
+        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The description of the dimension" PREVIOUS="sort" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
diff --git a/mod/workshop/form/numerrors/db/install.xml b/mod/workshop/form/numerrors/db/install.xml
index 0107271b96c08..d3f3528346332 100644
--- a/mod/workshop/form/numerrors/db/install.xml
+++ b/mod/workshop/form/numerrors/db/install.xml
@@ -1,20 +1,20 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/db" VERSION="20090908" COMMENT="XMLDB file for Moodle Number of errors subplugin"
+<XMLDB PATH="mod/workshop/db" VERSION="20120122" COMMENT="XMLDB file for Moodle Number of errors subplugin"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshopform_numerrors" COMMENT="The assessment dimensions definitions of Number of errors grading strategy forms" NEXT="workshopform_numerrors_map">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
-        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
+        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The description of the dimension" PREVIOUS="sort" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description" NEXT="descriptiontrust"/>
-        <FIELD NAME="descriptiontrust" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="grade0"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description" NEXT="descriptiontrust"/>
+        <FIELD NAME="descriptiontrust" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false" PREVIOUS="descriptionformat" NEXT="grade0"/>
         <FIELD NAME="grade0" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" COMMENT="The word describing the negative evaluation (like Poor, Missing, Absent, etc.). If NULL, it defaults to a translated string False" PREVIOUS="descriptiontrust" NEXT="grade1"/>
         <FIELD NAME="grade1" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false" COMMENT="A word for possitive evaluation (like Good, Present, OK etc). If NULL, it defaults to a translated string True" PREVIOUS="grade0" NEXT="weight"/>
-        <FIELD NAME="weight" TYPE="int" LENGTH="5" NOTNULL="false" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="Weight of this dimension" PREVIOUS="grade1"/>
+        <FIELD NAME="weight" TYPE="int" LENGTH="5" NOTNULL="false" DEFAULT="1" SEQUENCE="false" COMMENT="Weight of this dimension" PREVIOUS="grade1"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
@@ -23,10 +23,10 @@
     </TABLE>
     <TABLE NAME="workshopform_numerrors_map" COMMENT="This maps the number of errors to a percentual grade for submission" PREVIOUS="workshopform_numerrors">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of the workshop" PREVIOUS="id" NEXT="nonegative"/>
-        <FIELD NAME="nonegative" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Number of negative responses given by the reviewer" PREVIOUS="workshopid" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Percentual grade 0..100 for this number of negative responses" PREVIOUS="nonegative"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of the workshop" PREVIOUS="id" NEXT="nonegative"/>
+        <FIELD NAME="nonegative" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Number of negative responses given by the reviewer" PREVIOUS="workshopid" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="Percentual grade 0..100 for this number of negative responses" PREVIOUS="nonegative"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
diff --git a/mod/workshop/form/rubric/db/install.xml b/mod/workshop/form/rubric/db/install.xml
index 5297350e9c027..9653fad320b81 100644
--- a/mod/workshop/form/rubric/db/install.xml
+++ b/mod/workshop/form/rubric/db/install.xml
@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/workshop/db" VERSION="20091009" COMMENT="XMLDB file for workshop Rubric grading strategy"
+<XMLDB PATH="mod/workshop/db" VERSION="20120122" COMMENT="XMLDB file for workshop Rubric grading strategy"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="workshopform_rubric" COMMENT="The assessment dimensions definitions of Rubric grading strategy forms" NEXT="workshopform_rubric_levels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
-        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Workshop ID" PREVIOUS="id" NEXT="sort"/>
+        <FIELD NAME="sort" TYPE="int" LENGTH="10" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="Defines the dimension order within the assessment form" PREVIOUS="workshopid" NEXT="description"/>
         <FIELD NAME="description" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The description of the dimension" PREVIOUS="sort" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the description field" PREVIOUS="description"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="workshop_fk"/>
@@ -19,11 +19,11 @@
     </TABLE>
     <TABLE NAME="workshopform_rubric_levels" COMMENT="The definition of rubric rating scales" PREVIOUS="workshopform_rubric" NEXT="workshopform_rubric_config">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="dimensionid"/>
-        <FIELD NAME="dimensionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Which criterion this level is part of" PREVIOUS="id" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" DECIMALS="5" COMMENT="Grade representing this level." PREVIOUS="dimensionid" NEXT="definition"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="dimensionid"/>
+        <FIELD NAME="dimensionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Which criterion this level is part of" PREVIOUS="id" NEXT="grade"/>
+        <FIELD NAME="grade" TYPE="number" LENGTH="10" NOTNULL="true" SEQUENCE="false" DECIMALS="5" COMMENT="Grade representing this level." PREVIOUS="dimensionid" NEXT="definition"/>
         <FIELD NAME="definition" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false" COMMENT="The definition of this level" PREVIOUS="grade" NEXT="definitionformat"/>
-        <FIELD NAME="definitionformat" TYPE="int" LENGTH="3" NOTNULL="false" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the definition field" PREVIOUS="definition"/>
+        <FIELD NAME="definitionformat" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="The format of the definition field" PREVIOUS="definition"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="dimension_fk"/>
@@ -32,8 +32,8 @@
     </TABLE>
     <TABLE NAME="workshopform_rubric_config" COMMENT="Configuration table for the Rubric grading strategy" PREVIOUS="workshopform_rubric_levels">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="workshopid"/>
-        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="The id of workshop this configuartion applies for" PREVIOUS="id" NEXT="layout"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="workshopid"/>
+        <FIELD NAME="workshopid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="The id of workshop this configuartion applies for" PREVIOUS="id" NEXT="layout"/>
         <FIELD NAME="layout" TYPE="char" LENGTH="30" NOTNULL="false" DEFAULT="list" SEQUENCE="false" COMMENT="How should the rubric be displayed for reviewers" PREVIOUS="workshopid"/>
       </FIELDS>
       <KEYS>
diff --git a/portfolio/mahara/db/install.xml b/portfolio/mahara/db/install.xml
index 48ef556f195d1..9450b2a457c64 100644
--- a/portfolio/mahara/db/install.xml
+++ b/portfolio/mahara/db/install.xml
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="portfolio/mahara/db" VERSION="20080827" COMMENT="XMLDB file for Moodle portfolio/mahara"
+<XMLDB PATH="portfolio/mahara/db" VERSION="20120122" COMMENT="XMLDB file for Moodle portfolio/mahara"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="portfolio_mahara_queue" COMMENT="maps mahara tokens to transfer ids">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="transferid"/>
-        <FIELD NAME="transferid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="fk to portfolio_tempdata.id" PREVIOUS="id" NEXT="token"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="transferid"/>
+        <FIELD NAME="transferid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="fk to portfolio_tempdata.id" PREVIOUS="id" NEXT="token"/>
         <FIELD NAME="token" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" COMMENT="the token mahara sent us to use for this transfer." PREVIOUS="transferid"/>
       </FIELDS>
       <KEYS>
diff --git a/question/type/calculated/db/install.xml b/question/type/calculated/db/install.xml
index 34c5fd39aca8b..f0f33aeda6023 100644
--- a/question/type/calculated/db/install.xml
+++ b/question/type/calculated/db/install.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/calculated/db" VERSION="20100720" COMMENT="XMLDB file for Moodle question/type/calculated. This question type also relies on the question_numerical_units table created by the numerical question type, and the dataset tables created by lib/db/install.xml."
+<XMLDB PATH="question/type/calculated/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/calculated. This question type also relies on the question_numerical_units table created by the numerical question type, and the dataset tables created by lib/db/install.xml."
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_calculated" COMMENT="Options for questions of type calculated" NEXT="question_calculated_options">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="answer"/>
-        <FIELD NAME="answer" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="tolerance"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="answer"/>
+        <FIELD NAME="answer" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="tolerance"/>
         <FIELD NAME="tolerance" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="0.0" SEQUENCE="false" PREVIOUS="answer" NEXT="tolerancetype"/>
-        <FIELD NAME="tolerancetype" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="tolerance" NEXT="correctanswerlength"/>
-        <FIELD NAME="correctanswerlength" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="2" SEQUENCE="false" PREVIOUS="tolerancetype" NEXT="correctanswerformat"/>
-        <FIELD NAME="correctanswerformat" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="2" SEQUENCE="false" PREVIOUS="correctanswerlength"/>
+        <FIELD NAME="tolerancetype" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="tolerance" NEXT="correctanswerlength"/>
+        <FIELD NAME="correctanswerlength" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="tolerancetype" NEXT="correctanswerformat"/>
+        <FIELD NAME="correctanswerformat" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="2" SEQUENCE="false" PREVIOUS="correctanswerlength"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
@@ -24,19 +24,19 @@
     </TABLE>
     <TABLE NAME="question_calculated_options" COMMENT="Options for questions of type calculated" PREVIOUS="question_calculated" NEXT="question_dataset_definitions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="synchronize"/>
-        <FIELD NAME="synchronize" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="single"/>
-        <FIELD NAME="single" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 it multiple response (checkboxes). Otherwise it is radio buttons." PREVIOUS="synchronize" NEXT="shuffleanswers"/>
-        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Whether the choices can be randomly shuffled." PREVIOUS="single" NEXT="correctfeedback"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="synchronize"/>
+        <FIELD NAME="synchronize" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question" NEXT="single"/>
+        <FIELD NAME="single" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 it multiple response (checkboxes). Otherwise it is radio buttons." PREVIOUS="synchronize" NEXT="shuffleanswers"/>
+        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether the choices can be randomly shuffled." PREVIOUS="single" NEXT="correctfeedback"/>
         <FIELD NAME="correctfeedback" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Feedback shown for any correct response." PREVIOUS="shuffleanswers" NEXT="correctfeedbackformat"/>
-        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
+        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
         <FIELD NAME="partiallycorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Feedback shown for any partially correct response." PREVIOUS="correctfeedbackformat" NEXT="partiallycorrectfeedbackformat"/>
-        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
+        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
         <FIELD NAME="incorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Feedback shown for any incorrect response." PREVIOUS="partiallycorrectfeedbackformat" NEXT="incorrectfeedbackformat"/>
-        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="answernumbering"/>
+        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="answernumbering"/>
         <FIELD NAME="answernumbering" TYPE="char" LENGTH="10" NOTNULL="true" DEFAULT="abc" SEQUENCE="false" COMMENT="Indicates how and whether the choices should be numbered." PREVIOUS="incorrectfeedbackformat" NEXT="shownumcorrect"/>
-        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="answernumbering"/>
+        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="answernumbering"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
@@ -45,12 +45,12 @@
     </TABLE>
     <TABLE NAME="question_dataset_definitions" COMMENT="Organises and stores properties for dataset items" PREVIOUS="question_calculated_options" NEXT="question_dataset_items">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="category"/>
-        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="category"/>
+        <FIELD NAME="category" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
         <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="category" NEXT="type"/>
-        <FIELD NAME="type" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="options"/>
+        <FIELD NAME="type" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="name" NEXT="options"/>
         <FIELD NAME="options" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="type" NEXT="itemcount"/>
-        <FIELD NAME="itemcount" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="options"/>
+        <FIELD NAME="itemcount" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="options"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="category"/>
@@ -59,9 +59,9 @@
     </TABLE>
     <TABLE NAME="question_dataset_items" COMMENT="Individual dataset items" PREVIOUS="question_dataset_definitions" NEXT="question_datasets">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="definition"/>
-        <FIELD NAME="definition" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="itemnumber"/>
-        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definition" NEXT="value"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="definition"/>
+        <FIELD NAME="definition" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="itemnumber"/>
+        <FIELD NAME="itemnumber" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="definition" NEXT="value"/>
         <FIELD NAME="value" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="itemnumber"/>
       </FIELDS>
       <KEYS>
@@ -73,9 +73,9 @@
     </TABLE>
     <TABLE NAME="question_datasets" COMMENT="Many-many relation between questions and dataset definitions" PREVIOUS="question_dataset_items">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="datasetdefinition"/>
-        <FIELD NAME="datasetdefinition" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="datasetdefinition"/>
+        <FIELD NAME="datasetdefinition" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="question"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
diff --git a/question/type/essay/db/install.xml b/question/type/essay/db/install.xml
index a7c70f0427332..c072f535f1ee2 100644
--- a/question/type/essay/db/install.xml
+++ b/question/type/essay/db/install.xml
@@ -1,18 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/essay/db" VERSION="20110310" COMMENT="XMLDB file for Moodle question/type/essay"
+<XMLDB PATH="question/type/essay/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/essay"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="qtype_essay_options" COMMENT="Extra options for essay questions.">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="questionid"/>
-        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="false" COMMENT="Foreign key linking to the question table." PREVIOUS="id" NEXT="responseformat"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="questionid"/>
+        <FIELD NAME="questionid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false" COMMENT="Foreign key linking to the question table." PREVIOUS="id" NEXT="responseformat"/>
         <FIELD NAME="responseformat" TYPE="char" LENGTH="16" NOTNULL="true" DEFAULT="editor" SEQUENCE="false" COMMENT="The type of input area students should be given for their response." PREVIOUS="questionid" NEXT="responsefieldlines"/>
-        <FIELD NAME="responsefieldlines" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="15" SEQUENCE="false" COMMENT="Approximate height, in lines, of the input box the students should be given for their response." PREVIOUS="responseformat" NEXT="attachments"/>
-        <FIELD NAME="attachments" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Whether, and how many, attachments a student is allowed to include with their response. -1 means unlimited." PREVIOUS="responsefieldlines" NEXT="graderinfo"/>
+        <FIELD NAME="responsefieldlines" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="15" SEQUENCE="false" COMMENT="Approximate height, in lines, of the input box the students should be given for their response." PREVIOUS="responseformat" NEXT="attachments"/>
+        <FIELD NAME="attachments" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether, and how many, attachments a student is allowed to include with their response. -1 means unlimited." PREVIOUS="responsefieldlines" NEXT="graderinfo"/>
         <FIELD NAME="graderinfo" TYPE="text" LENGTH="small" NOTNULL="false" SEQUENCE="false" COMMENT="Information shown to people with permission to manually grade the question, when they are grading." PREVIOUS="attachments" NEXT="graderinfoformat"/>
-        <FIELD NAME="graderinfoformat" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="The text format for graderinfo." PREVIOUS="graderinfo"/>
+        <FIELD NAME="graderinfoformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The text format for graderinfo." PREVIOUS="graderinfo"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="questionid"/>
diff --git a/question/type/match/db/install.xml b/question/type/match/db/install.xml
index 2ae3b17d0722a..d159a5035088e 100644
--- a/question/type/match/db/install.xml
+++ b/question/type/match/db/install.xml
@@ -1,22 +1,22 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/match/db" VERSION="20100721" COMMENT="XMLDB file for Moodle question/type/match"
+<XMLDB PATH="question/type/match/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/match"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_match" COMMENT="Defines fixed matching questions" NEXT="question_match_sub">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="subquestions"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="subquestions"/>
         <FIELD NAME="subquestions" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="question" NEXT="shuffleanswers"/>
-        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" PREVIOUS="subquestions" NEXT="correctfeedback"/>
+        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="subquestions" NEXT="correctfeedback"/>
         <FIELD NAME="correctfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any correct response." PREVIOUS="shuffleanswers" NEXT="correctfeedbackformat"/>
-        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
+        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
         <FIELD NAME="partiallycorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any partially correct response." PREVIOUS="correctfeedbackformat" NEXT="partiallycorrectfeedbackformat"/>
-        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
+        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
         <FIELD NAME="incorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any incorrect response." PREVIOUS="partiallycorrectfeedbackformat" NEXT="incorrectfeedbackformat"/>
-        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="shownumcorrect"/>
-        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="incorrectfeedbackformat"/>
+        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="shownumcorrect"/>
+        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="incorrectfeedbackformat"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
@@ -25,11 +25,11 @@
     </TABLE>
     <TABLE NAME="question_match_sub" COMMENT="Defines the subquestions that make up a matching question" PREVIOUS="question_match">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="code"/>
-        <FIELD NAME="code" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Should this point to parent question_match-&amp;gt;id ?" PREVIOUS="id" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="code" NEXT="questiontext"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="code"/>
+        <FIELD NAME="code" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Should this point to parent question_match-&amp;gt;id ?" PREVIOUS="id" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="code" NEXT="questiontext"/>
         <FIELD NAME="questiontext" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="question" NEXT="questiontextformat"/>
-        <FIELD NAME="questiontextformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="questiontext" NEXT="answertext"/>
+        <FIELD NAME="questiontextformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="questiontext" NEXT="answertext"/>
         <FIELD NAME="answertext" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" PREVIOUS="questiontextformat"/>
       </FIELDS>
       <KEYS>
diff --git a/question/type/multianswer/db/install.xml b/question/type/multianswer/db/install.xml
index 753bd5fe3a0ae..fdb790a6835cd 100644
--- a/question/type/multianswer/db/install.xml
+++ b/question/type/multianswer/db/install.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/multianswer/db" VERSION="20060812" COMMENT="XMLDB file for Moodle question/type/multianswer">
+<XMLDB PATH="question/type/multianswer/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/multianswer">
   <TABLES>
     <TABLE NAME="question_multianswer" COMMENT="Options for multianswer questions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="sequence"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="sequence"/>
         <FIELD NAME="sequence" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="question"/>
       </FIELDS>
       <KEYS>
diff --git a/question/type/multichoice/db/install.xml b/question/type/multichoice/db/install.xml
index 3516b9ebcc375..908add2c6379f 100644
--- a/question/type/multichoice/db/install.xml
+++ b/question/type/multichoice/db/install.xml
@@ -1,25 +1,25 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/multichoice/db" VERSION="20100716" COMMENT="XMLDB file for Moodle question/type/multichoice"
+<XMLDB PATH="question/type/multichoice/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/multichoice"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_multichoice" COMMENT="Options for multiple choice questions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id" PREVIOUS="id" NEXT="layout"/>
-        <FIELD NAME="layout" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Not used. Was intended for a vertical/horizontal layout option. See MDL-18445." PREVIOUS="question" NEXT="answers"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id" PREVIOUS="id" NEXT="layout"/>
+        <FIELD NAME="layout" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Not used. Was intended for a vertical/horizontal layout option. See MDL-18445." PREVIOUS="question" NEXT="answers"/>
         <FIELD NAME="answers" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Redundant. Comma-separated list of question_answer ids. SELECT id FROM question_answers WHERE question = ? ORDER BY id." PREVIOUS="layout" NEXT="single"/>
-        <FIELD NAME="single" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 it multiple response (checkboxes). Otherwise it is radio buttons." PREVIOUS="answers" NEXT="shuffleanswers"/>
-        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="1" SEQUENCE="false" COMMENT="Whether the choices can be randomly shuffled." PREVIOUS="single" NEXT="correctfeedback"/>
+        <FIELD NAME="single" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If 0 it multiple response (checkboxes). Otherwise it is radio buttons." PREVIOUS="answers" NEXT="shuffleanswers"/>
+        <FIELD NAME="shuffleanswers" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Whether the choices can be randomly shuffled." PREVIOUS="single" NEXT="correctfeedback"/>
         <FIELD NAME="correctfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any correct response." PREVIOUS="shuffleanswers" NEXT="correctfeedbackformat"/>
-        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
+        <FIELD NAME="correctfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="correctfeedback" NEXT="partiallycorrectfeedback"/>
         <FIELD NAME="partiallycorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any partially correct response." PREVIOUS="correctfeedbackformat" NEXT="partiallycorrectfeedbackformat"/>
-        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
+        <FIELD NAME="partiallycorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="partiallycorrectfeedback" NEXT="incorrectfeedback"/>
         <FIELD NAME="incorrectfeedback" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" COMMENT="Feedback shown for any incorrect response." PREVIOUS="partiallycorrectfeedbackformat" NEXT="incorrectfeedbackformat"/>
-        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="answernumbering"/>
+        <FIELD NAME="incorrectfeedbackformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="incorrectfeedback" NEXT="answernumbering"/>
         <FIELD NAME="answernumbering" TYPE="char" LENGTH="10" NOTNULL="true" DEFAULT="abc" SEQUENCE="false" COMMENT="Indicates how and whether the choices should be numbered." PREVIOUS="incorrectfeedbackformat" NEXT="shownumcorrect"/>
-        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="answernumbering"/>
+        <FIELD NAME="shownumcorrect" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="If true, then when the user gets a multiple-response question partially correct, tell them how many choices they got correct alongside the feedback." PREVIOUS="answernumbering"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
diff --git a/question/type/numerical/db/install.xml b/question/type/numerical/db/install.xml
index 15dcb7772984c..f56fab6d9f126 100644
--- a/question/type/numerical/db/install.xml
+++ b/question/type/numerical/db/install.xml
@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/numerical/db" VERSION="20100720" COMMENT="XMLDB file for Moodle question/type/numerical"
+<XMLDB PATH="question/type/numerical/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/numerical"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_numerical" COMMENT="Options for numerical questions." NEXT="question_numerical_options">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Redundant, because of the answer field. Foreign key references question.id." PREVIOUS="id" NEXT="answer"/>
-        <FIELD NAME="answer" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id." PREVIOUS="question" NEXT="tolerance"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Redundant, because of the answer field. Foreign key references question.id." PREVIOUS="id" NEXT="answer"/>
+        <FIELD NAME="answer" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id." PREVIOUS="question" NEXT="tolerance"/>
         <FIELD NAME="tolerance" TYPE="char" LENGTH="255" NOTNULL="true" DEFAULT="0.0" SEQUENCE="false" COMMENT="Allowed error when matching a response to this answer. I don't know why this is stored as a string." PREVIOUS="answer"/>
       </FIELDS>
       <KEYS>
@@ -21,12 +21,12 @@
     </TABLE>
     <TABLE NAME="question_numerical_options" COMMENT="Options for questions of type numerical This table is also used by the calculated question type" PREVIOUS="question_numerical" NEXT="question_numerical_units">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="showunits"/>
-        <FIELD NAME="showunits" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="How units are handled: 3) Not used at all, 0) Optional, or 1) must be right or penalty applied." PREVIOUS="question" NEXT="unitsleft"/>
-        <FIELD NAME="unitsleft" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="display the unit at left as in $1.00" PREVIOUS="showunits" NEXT="unitgradingtype"/>
-        <FIELD NAME="unitgradingtype" TYPE="int" LENGTH="4" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 no penalty, 1 fraction response grade, 2 fraction total grade" PREVIOUS="unitsleft" NEXT="unitpenalty"/>
-        <FIELD NAME="unitpenalty" TYPE="number" LENGTH="12" NOTNULL="true" UNSIGNED="true" DEFAULT="0.1" SEQUENCE="false" DECIMALS="7" COMMENT="Penalty for getting the unit wrong, when they are being graded." PREVIOUS="unitgradingtype"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="showunits"/>
+        <FIELD NAME="showunits" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="How units are handled: 3) Not used at all, 0) Optional, or 1) must be right or penalty applied." PREVIOUS="question" NEXT="unitsleft"/>
+        <FIELD NAME="unitsleft" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="display the unit at left as in $1.00" PREVIOUS="showunits" NEXT="unitgradingtype"/>
+        <FIELD NAME="unitgradingtype" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="0 no penalty, 1 fraction response grade, 2 fraction total grade" PREVIOUS="unitsleft" NEXT="unitpenalty"/>
+        <FIELD NAME="unitpenalty" TYPE="number" LENGTH="12" NOTNULL="true" DEFAULT="0.1" SEQUENCE="false" DECIMALS="7" COMMENT="Penalty for getting the unit wrong, when they are being graded." PREVIOUS="unitgradingtype"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
@@ -35,9 +35,9 @@
     </TABLE>
     <TABLE NAME="question_numerical_units" COMMENT="Optional unit options for numerical questions. This table is also used by the calculated question type." PREVIOUS="question_numerical_options">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id" PREVIOUS="id" NEXT="multiplier"/>
-        <FIELD NAME="multiplier" TYPE="number" LENGTH="40" NOTNULL="true" UNSIGNED="false" DEFAULT="1.00000000000000000000" SEQUENCE="false" DECIMALS="20" COMMENT="The multiplier for this unit. For example, if the first unit is (1.0, 'cm'), another unit might be (0.1, 'mm') or (100.0, 'm')." PREVIOUS="question" NEXT="unit"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id" PREVIOUS="id" NEXT="multiplier"/>
+        <FIELD NAME="multiplier" TYPE="number" LENGTH="40" NOTNULL="true" DEFAULT="1.00000000000000000000" SEQUENCE="false" DECIMALS="20" COMMENT="The multiplier for this unit. For example, if the first unit is (1.0, 'cm'), another unit might be (0.1, 'mm') or (100.0, 'm')." PREVIOUS="question" NEXT="unit"/>
         <FIELD NAME="unit" TYPE="char" LENGTH="50" NOTNULL="true" SEQUENCE="false" COMMENT="The unit. For example 'm' or 'kg'." PREVIOUS="multiplier"/>
       </FIELDS>
       <KEYS>
diff --git a/question/type/randomsamatch/db/install.xml b/question/type/randomsamatch/db/install.xml
index 164af920ade90..1622ddd05bb63 100644
--- a/question/type/randomsamatch/db/install.xml
+++ b/question/type/randomsamatch/db/install.xml
@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/randomsamatch/db" VERSION="20060812" COMMENT="XMLDB file for Moodle question/type/randomsamatch"
+<XMLDB PATH="question/type/randomsamatch/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/randomsamatch"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_randomsamatch" COMMENT="Info about a random short-answer matching question">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="choose"/>
-        <FIELD NAME="choose" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="4" SEQUENCE="false" COMMENT="Number of subquestions to randomly generate." PREVIOUS="question"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="choose"/>
+        <FIELD NAME="choose" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="4" SEQUENCE="false" COMMENT="Number of subquestions to randomly generate." PREVIOUS="question"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
diff --git a/question/type/shortanswer/db/install.xml b/question/type/shortanswer/db/install.xml
index 8aaf8e2629063..eb410f6de1526 100644
--- a/question/type/shortanswer/db/install.xml
+++ b/question/type/shortanswer/db/install.xml
@@ -1,15 +1,15 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/shortanswer/db" VERSION="20090305" COMMENT="XMLDB file for Moodle question/type/shortanswer"
+<XMLDB PATH="question/type/shortanswer/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/shortanswer"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_shortanswer" COMMENT="Options for short answer questions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="answers"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="answers"/>
         <FIELD NAME="answers" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false" COMMENT="Redundant. Comma-separated list of question_answer ids. SELECT id FROM question_answers WHERE question = ? ORDER BY id." PREVIOUS="question" NEXT="usecase"/>
-        <FIELD NAME="usecase" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" COMMENT="Whether answers are matched case-sensitively." PREVIOUS="answers"/>
+        <FIELD NAME="usecase" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Whether answers are matched case-sensitively." PREVIOUS="answers"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>
diff --git a/question/type/truefalse/db/install.xml b/question/type/truefalse/db/install.xml
index c5ca5266a233c..5078c7bf4e2d9 100644
--- a/question/type/truefalse/db/install.xml
+++ b/question/type/truefalse/db/install.xml
@@ -1,15 +1,15 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="question/type/truefalse/db" VERSION="20060812" COMMENT="XMLDB file for Moodle question/type/truefalse"
+<XMLDB PATH="question/type/truefalse/db" VERSION="20120122" COMMENT="XMLDB file for Moodle question/type/truefalse"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="question_truefalse" COMMENT="Options for True-False questions">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="question"/>
-        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="trueanswer"/>
-        <FIELD NAME="trueanswer" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id. The 'True' choice." PREVIOUS="question" NEXT="falseanswer"/>
-        <FIELD NAME="falseanswer" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id. The 'False' choice." PREVIOUS="trueanswer"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" NEXT="question"/>
+        <FIELD NAME="question" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question.id." PREVIOUS="id" NEXT="trueanswer"/>
+        <FIELD NAME="trueanswer" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id. The 'True' choice." PREVIOUS="question" NEXT="falseanswer"/>
+        <FIELD NAME="falseanswer" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Foreign key references question_answers.id. The 'False' choice." PREVIOUS="trueanswer"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" NEXT="question"/>