app/db/session.py

from collections.abc import AsyncIterator

from sqlalchemy.ext.asyncio import (
    AsyncSession,
    async_sessionmaker,
    create_async_engine,
)

from app.core.config import settings


engine = create_async_engine(
    settings.sqlalchemy_database_url,
    pool_pre_ping=True,
    pool_recycle=300,
    echo=False,
)

AsyncSessionFactory = async_sessionmaker(
    bind=engine,
    class_=AsyncSession,
    autoflush=False,
    expire_on_commit=False,
)


async def get_database_session() -> AsyncIterator[AsyncSession]:
    async with AsyncSessionFactory() as session:
        try:
            yield session
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()