Добавлено сохранение заказов в postgres

app/adapters/postgres/engine.py

@@ -0,0 +1,16 @@
+"""PostgreSQL async engine and session factory management."""
+
+from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker
+from sqlalchemy.ext.asyncio import create_async_engine
+
+from app.config import PostgresConfig
+
+
+def create_postgres_engine(config: PostgresConfig) -> AsyncEngine:
+    return create_async_engine(config.dsn, pool_pre_ping=True)
+
+
+def create_postgres_session_factory(
+    engine: AsyncEngine,
+) -> async_sessionmaker[AsyncSession]:
+    return async_sessionmaker(engine, expire_on_commit=False)