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Async Database Setup
Supports PostgreSQL (local dev) and SQLite (HF Spaces) via DATABASE_URL.
"""
from __future__ import annotations
import os
import structlog
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
from sqlalchemy.orm import DeclarativeBase
from app.core.config import settings
logger = structlog.get_logger(__name__)
# ── Engine ───────────────────────────────────────────────────
connect_args = {}
if settings.use_sqlite:
connect_args["check_same_thread"] = False
engine = create_async_engine(
settings.DATABASE_URL,
echo=settings.DEBUG,
connect_args=connect_args,
)
AsyncSessionLocal = async_sessionmaker(
bind=engine,
class_=AsyncSession,
expire_on_commit=False,
autocommit=False,
autoflush=False,
)
class Base(DeclarativeBase):
"""Base class for all SQLAlchemy models."""
pass
async def init_db() -> None:
"""Create all tables on startup (ensures all tables exist in PG & SQLite)."""
# Import all models here so Base knows about all tables
from app.models import tenant, user, audit, document, chat # noqa: F401
if settings.use_sqlite:
os.makedirs("./data", exist_ok=True)
async with engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
logger.info("Database tables initialized successfully", db=settings.DATABASE_URL)
async def get_db() -> AsyncSession:
"""FastAPI dependency: provides async DB session."""
async with AsyncSessionLocal() as session:
try:
yield session
await session.commit()
except Exception:
await session.rollback()
raise
finally:
await session.close()
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