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6a0ff33 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | """SQLAlchemy async database engine and session management."""
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase
from backend.config.settings import get_settings
class Base(DeclarativeBase):
"""SQLAlchemy declarative base for all models."""
pass
_settings = get_settings()
engine = create_async_engine(
_settings.database_url,
echo=_settings.debug,
connect_args={"check_same_thread": False},
)
async_session_factory = async_sessionmaker(
engine,
class_=AsyncSession,
expire_on_commit=False,
)
async def init_db() -> None:
"""Create all database tables."""
# Import models so they register with Base.metadata
import backend.db.models # noqa: F401
async with engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
async def get_async_session() -> AsyncSession:
"""Yield an async database session."""
async with async_session_factory() as session:
yield session
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