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from typing import AsyncGenerator
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
engine = create_async_engine("postgresql+asyncpg://app:secret@db:5432/prod", pool_size=25, max_overflow=10)
AsyncSessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)
async def get_db_session() -> AsyncGenerator[AsyncSession, None]:
async with AsyncSessionLocal() as session:
yield session