feat: add support for asyncpg

backend/db/database.py

@@ -1,14 +1,19 @@
 from databases import Database
-from sqlalchemy import create_engine, MetaData
+from sqlalchemy import MetaData
 from sqlalchemy.orm import declarative_base
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncEngine
 
 from backend.config import settings
 
-# for Alembic migrations and sync operations
-engine = create_engine(settings.database_url)
-# to use with async requests
-database = Database(settings.database_url)
-
 metadata = MetaData()
 Base = declarative_base(metadata=metadata)
 
+# async engine for use with run_sync and sessionmaker
+engine = create_async_engine(
+    settings.database_url,
+    echo=(settings.environment == "dev"),
+    future=True,
+)
+
+# asyncpg connection used by `databases` package
+database = Database(settings.database_url)