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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f186fab
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "tgcd"
+version = "0.1.0"
+authors = ["foldu <foldu@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tonic = "=0.1.0-alpha.3"
+tokio = "0.2.0-alpha.6"
+anyhow = "1.0.12"
+prost = "0.5.0"
+futures-preview = "0.3.0-alpha.19"
+bytes = "0.4.12"
+snafu = { version = "0.5.0", features = ["unstable-futures"] }
+tokio-postgres = "0.5.0-alpha.1"
+envy = "0.4.0"
+serde = { version = "1.0.101", features = ["derive"] }
+log = "0.4.8"
+
+[build-dependencies]
+tonic-build = "0.1.0-alpha.3"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..a25526a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM rustlang/rust:nightly
+RUN USER=root cargo new --bin tgcd
+WORKDIR /tgcd
+
+COPY ./Cargo.lock ./Cargo.lock
+COPY ./Cargo.toml ./Cargo.toml
+
+RUN cargo build --release && rm src/*.rs
+
+COPY . .
+
+RUN cargo build --release
+
+FROM rustlang/rust:nightly
+
+COPY --from=0 /tgcd/target/release/tgcd .
+
+EXPOSE 8000
+
+CMD ["./tgcd"]
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..bdd5228
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    tonic_build::compile_protos("proto/tgcd.proto").unwrap();
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..83cad2b
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,16 @@
+---
+version: "3"
+
+services:
+  db:
+    image: postgres:12.0-alpine
+    volumes:
+      - ./data:/var/lib/postgresql/data
+    ports:
+      - 5432:5432
+  app:
+    depends_on:
+      - db
+    build: .
+    ports:
+      - 8080:8080
diff --git a/proto/tgcd.proto b/proto/tgcd.proto
new file mode 100644
index 0000000..845bfd6
--- /dev/null
+++ b/proto/tgcd.proto
@@ -0,0 +1,29 @@
+syntax = "proto3";
+
+package tgcd;
+
+import "google/protobuf/empty.proto";
+
+service Tgcd {
+  rpc GetTags(Hash) returns (Tags) {}
+  rpc AddTagsToHash(AddTags) returns (google.protobuf.Empty) {}
+  rpc CopyTags(SrcDest) returns (google.protobuf.Empty) {}
+}
+
+message Hash {
+  bytes hash = 1;
+}
+
+message Tags {
+  repeated string tags = 1;
+}
+
+message AddTags {
+  bytes hash = 1;
+  repeated string tags = 2;
+}
+
+message SrcDest {
+  bytes src_hash = 1;
+  bytes dest_hash = 2;
+}
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..b93fbd9
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,3 @@
+merge_imports = true
+edition = "2018"
+imports_layout = "HorizontalVertical"
diff --git a/sql/schema.sql b/sql/schema.sql
new file mode 100644
index 0000000..0c0e26d
--- /dev/null
+++ b/sql/schema.sql
@@ -0,0 +1,15 @@
+CREATE TABLE hash(
+    id SERIAL PRIMARY KEY,
+    hash BYTEA NOT NULL UNIQUE
+);
+
+CREATE TABLE hash_tag(
+    hash_id INTEGER NOT NULL,
+    tag_id INTEGER NOT NULL,
+    PRIMARY KEY (hash_id, tag_id)
+);
+
+CREATE TABLE tag(
+    id SERIAL PRIMAY KEY,
+    name TEXT NOT NULL UNIQUE
+);
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..63aad0f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,185 @@
+use std::sync::Arc;
+
+use futures::prelude::*;
+use serde::Deserialize;
+use snafu::{futures::TryFutureExt, ResultExt, Snafu};
+use tokio::sync::Mutex;
+use tokio_postgres as postgres;
+use tonic::{transport::Server, Request, Response, Status};
+
+mod tgcd {
+    tonic::include_proto!("tgcd");
+}
+
+use tgcd::{server, AddTags, Hash, Tags};
+
+#[derive(Deserialize)]
+struct Config {
+    postgres_url: String,
+}
+
+#[derive(Clone)]
+struct Tgcd {
+    inner: Arc<TgcdInner>,
+}
+
+impl Tgcd {
+    async fn new(cfg: &Config) -> Result<Self, anyhow::Error> {
+        let (client, connection) = postgres::connect(&cfg.postgres_url, postgres::NoTls).await?;
+
+        let schema = include_str!("../sql/schema.sql");
+        client.batch_execute(schema).await?;
+
+        let connection = connection.map(|r| {
+            if let Err(e) = r {
+                log::error!("{}", e);
+            }
+        });
+        tokio::spawn(connection);
+
+        Ok(Self {
+            inner: Arc::new(TgcdInner {
+                client: Mutex::new(client),
+            }),
+        })
+    }
+}
+
+struct TgcdInner {
+    client: Mutex<postgres::Client>,
+}
+
+#[derive(Snafu, Debug)]
+pub enum Error {
+    Postgres { source: postgres::Error },
+}
+
+impl From<Error> for Status {
+    fn from(other: Error) -> Self {
+        match other {
+            Error::Postgres { .. } => Status::new(tonic::Code::Unavailable, "db error"),
+        }
+    }
+}
+
+async fn get_tags(client: &postgres::Client, hash: &[u8]) -> Result<Vec<String>, Error> {
+    let stmnt = client
+        .prepare(
+            "
+        SELECT tag.name
+        FROM tag tag, hash_tag hash_tag, hash hash
+        WHERE
+            tag.id = hash_tag.tag_id
+            AND hash_tag.hash_id = hash.id
+            AND hash.hash = $1",
+        )
+        .context(Postgres)
+        .await?;
+    let tags = client.query(&stmnt, &[&hash]).context(Postgres).await?;
+    Ok(tags.into_iter().map(|row| row.get(0)).collect())
+}
+
+async fn get_or_insert_hash(client: &postgres::Transaction<'_>, hash: &[u8]) -> Result<i32, Error> {
+    let stmnt = client
+        .prepare(
+            "
+    WITH inserted AS (
+        INSERT INTO hash(hash)
+        VALUES($1)
+        ON CONFLICT DO NOTHING
+        RETURNING id
+    )
+    SELECT * FROM inserted
+
+    UNION ALL
+
+    SELECT id FROM hash
+    WHERE hash = $1
+    ",
+        )
+        .context(Postgres)
+        .await?;
+
+    client
+        .query_one(&stmnt, &[&hash])
+        .context(Postgres)
+        .await
+        .map(|row| row.get(0))
+}
+
+async fn get_or_insert_tag(txn: &postgres::Transaction<'_>, tag: &str) -> Result<i32, Error> {
+    let stmnt = txn
+        .prepare(
+            "
+    WITH inserted AS (
+        INSERT INTO tag(name)
+        VALUES($1)
+        ON CONFLICT DO NOTHING
+        RETURNING id
+    )
+    SELECT * FROM inserted
+
+    UNION ALL
+
+    SELECT id FROM tag
+    WHERE name = $1
+    ",
+        )
+        .context(Postgres)
+        .await?;
+
+    txn.query_one(&stmnt, &[&tag])
+        .context(Postgres)
+        .await
+        .map(|row| row.get(0))
+}
+
+#[tonic::async_trait]
+impl server::Tgcd for Tgcd {
+    async fn get_tags(&self, req: Request<Hash>) -> Result<Response<Tags>, Status> {
+        let client = self.inner.client.lock().await;
+        let tags = get_tags(&client, &req.into_inner().hash).await?;
+
+        Ok(Response::new(Tags { tags }))
+    }
+
+    async fn add_tags_to_hash(&self, req: Request<AddTags>) -> Result<Response<()>, Status> {
+        let mut client = self.inner.client.lock().await;
+        let AddTags { hash, tags } = req.into_inner();
+
+        let txn = client.transaction().context(Postgres).await?;
+        let hash_id = get_or_insert_hash(&txn, &hash).await?;
+        for tag in tags {
+            let tag_id = get_or_insert_tag(&txn, &tag).await?;
+            txn.execute(
+                "INSERT INTO hash_tag(tag_id, hash_id) VALUES ($1, $2)",
+                &[&tag_id, &hash_id],
+            )
+            .context(Postgres)
+            .await?;
+        }
+
+        txn.commit().context(Postgres).await?;
+
+        Ok(Response::new(()))
+    }
+}
+
+async fn run() -> Result<(), anyhow::Error> {
+    let addr = "0.0.0.0:8000".parse().unwrap();
+    let config = envy::from_env()?;
+    let tgcd = Tgcd::new(&config).await?;
+
+    Server::builder()
+        .serve(addr, server::TgcdServer::new(tgcd))
+        .await?;
+
+    Ok(())
+}
+
+fn main() {
+    let rt = tokio::runtime::Runtime::new().unwrap();
+    if let Err(e) = rt.block_on(run()) {
+        eprintln!("{}", e);
+    }
+}