app/shared/db/session.py

"""Database session and engine configuration."""

from collections.abc import AsyncGenerator

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

from app.core.config import settings

# Create async engine
engine = create_async_engine(
    settings.database_url,
    echo=False,  # Disable SQL logging (embedding vectors are too verbose)
    pool_pre_ping=True,
)

# Session factory
async_session_maker = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


async def get_db() -> AsyncGenerator[AsyncSession, None]:
    """Dependency for getting database session."""
    async with async_session_maker() as session:
        try:
            yield session
        finally:
            await session.close()