From c9ba52d7321b2cae17776c66723c837a75c3bfdf Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Tue, 14 Sep 2021 06:30:18 +0200
Subject: [PATCH] Expire cached pairs in age-filter once per day

---
 freqtrade/plugins/pairlist/AgeFilter.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/freqtrade/plugins/pairlist/AgeFilter.py b/freqtrade/plugins/pairlist/AgeFilter.py
index 32fef5fb016..1fba0012394 100644
--- a/freqtrade/plugins/pairlist/AgeFilter.py
+++ b/freqtrade/plugins/pairlist/AgeFilter.py
@@ -11,6 +11,7 @@
 from freqtrade.exceptions import OperationalException
 from freqtrade.misc import plural
 from freqtrade.plugins.pairlist.IPairList import IPairList
+from freqtrade.configuration import PeriodicCache
 
 
 logger = logging.getLogger(__name__)
@@ -25,6 +26,7 @@ def __init__(self, exchange, pairlistmanager,
 
         # Checked symbols cache (dictionary of ticker symbol => timestamp)
         self._symbolsChecked: Dict[str, int] = {}
+        self._too_young_pairs = PeriodicCache(maxsize=1000, ttl=86_400)
 
         self._min_days_listed = pairlistconfig.get('min_days_listed', 10)
         self._max_days_listed = pairlistconfig.get('max_days_listed', None)
@@ -69,10 +71,12 @@ def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
         :param tickers: Tickers (from exchange.get_tickers()). May be cached.
         :return: new allowlist
         """
-        needed_pairs = [(p, '1d') for p in pairlist if p not in self._symbolsChecked]
+        needed_pairs = [
+            (p, '1d') for p in pairlist
+            if p not in self._symbolsChecked and p not in self._too_young_pairs]
         if not needed_pairs:
             return pairlist
-
+        logger.info(f"needed pairs {needed_pairs}")
         since_days = -(
             self._max_days_listed if self._max_days_listed else self._min_days_listed
         ) - 1
@@ -118,5 +122,6 @@ def _validate_pair_loc(self, pair: str, daily_candles: Optional[DataFrame]) -> b
                     " or more than "
                     f"{self._max_days_listed} {plural(self._max_days_listed, 'day')}"
                 ) if self._max_days_listed else ''), logger.info)
+                self._too_young_pairs[pair] = arrow.utcnow().int_timestamp * 1000
                 return False
         return False