init

app/storage/database.py

@@ -0,0 +1,19 @@
+from sqlalchemy import event
+from sqlalchemy.ext.asyncio import AsyncEngine, async_sessionmaker, create_async_engine
+
+
+def create_engine(database_url: str) -> AsyncEngine:
+  engine = create_async_engine(database_url, echo=False)
+
+  @event.listens_for(engine.sync_engine, "connect")
+  def _set_sqlite_pragma(dbapi_conn, _record) -> None:
+    cursor = dbapi_conn.cursor()
+    cursor.execute("PRAGMA journal_mode=WAL")
+    cursor.execute("PRAGMA synchronous=NORMAL")
+    cursor.close()
+
+  return engine
+
+
+def create_session_factory(engine: AsyncEngine) -> async_sessionmaker:
+  return async_sessionmaker(engine, expire_on_commit=False)