backend/app/db/database.py

"""Database configuration and session management."""

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

from app.core.config import settings

# Create async engine
engine = create_async_engine(
    settings.DATABASE_URL,
    echo=settings.DATABASE_ECHO,
    future=True,
)

# Create async session factory
AsyncSessionLocal = async_sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autocommit=False,
    autoflush=False,
)

# Base class for models
Base = declarative_base()


async def get_db() -> AsyncSession:
    """Dependency for getting database session."""
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()


async def init_db() -> None:
    """Initialize database (create tables)."""
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)