project structure and database

backend/session.py

@@ -0,0 +1,21 @@
+from typing import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker
+
+from .config import PG_DATABASE, PG_HOST, PG_PASSWORD, PG_LOGIN
+
+DATABASE_URL = f"postgresql+asyncpg://{PG_LOGIN}:{PG_PASSWORD}@{PG_HOST}/{PG_DATABASE}"
+engine = create_async_engine(DATABASE_URL)
+session_maker = sessionmaker(
+    engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autocommit=False,
+    autoflush=False,
+)
+
+
+async def get_session() -> AsyncGenerator[AsyncSession, None]:
+    async with session_maker() as session:
+        yield session