phase-5/backend/src/utils/database.py

"""
Database connection and session management
"""
from contextlib import asynccontextmanager
from typing import AsyncGenerator

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

from ..config import settings
from .logging import get_logger

logger = get_logger(__name__)

# Create async engine
engine = create_async_engine(
    settings.database_url,
    echo=settings.app_env == "local",
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20,
)

# Create async session factory
async_session_factory = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
)


@asynccontextmanager
async def get_db_session() -> AsyncGenerator[AsyncSession, None]:
    """Get database session with automatic cleanup"""
    async with async_session_factory() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()


async def init_database() -> None:
    """Initialize database tables"""
    from ..models import Base
    
    logger.info("Initializing database...")
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    logger.info("Database initialized successfully")


async def close_database() -> None:
    """Close database connections"""
    logger.info("Closing database connections...")
    await engine.dispose()
    logger.info("Database connections closed")