Refactor to async TimescaleDB backend & add Alembic migrations

docker-compose.yml

@@ -5,18 +5,37 @@ services:
     build: .
     ports:
       - "127.0.0.1:8765:8765"
+    depends_on:
+      - db
     volumes:
-      # Mount local database file for persistence
-      - "./dereth.db:/app/dereth.db"
       - "./main.py:/app/main.py"
-      - "./db.py:/app/db.py"
+      - "./db_async.py:/app/db_async.py"
       - "./static:/app/static"
+      - "./alembic:/app/alembic"
+      - "./alembic.ini:/app/alembic.ini"
     environment:
-      # Override database and application settings as needed
+      # Database connection URL for TimescaleDB
+      DATABASE_URL: "postgresql://postgres:password@db:5432/dereth"
+      # Override application settings as needed
       DB_MAX_SIZE_MB: "2048"
       DB_RETENTION_DAYS: "7"
       DB_MAX_SQL_LENGTH: "1000000000"
       DB_MAX_SQL_VARIABLES: "32766"
       DB_WAL_AUTOCHECKPOINT_PAGES: "1000"
       SHARED_SECRET: "your_shared_secret"
-    restart: unless-stopped
+    restart: unless-stopped
+
+  db:
+    image: timescale/timescaledb:latest-pg14
+    container_name: dereth-db
+    environment:
+      POSTGRES_DB: dereth
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: password
+    volumes:
+      - timescale-data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+ 
+volumes:
+  timescale-data: