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67 lines
1.8 KiB
Python
67 lines
1.8 KiB
Python
"""Database engine, session factory, and base model.
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Uses async SQLAlchemy with aiosqlite for local dev and asyncpg for production PostgreSQL.
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"""
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from sqlalchemy.ext.asyncio import (
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from app.config import settings
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engine = create_async_engine(
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settings.DATABASE_URL,
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echo=settings.DEBUG,
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future=True,
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)
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async_session_factory = async_sessionmaker(
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engine,
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class_=AsyncSession,
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expire_on_commit=False,
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)
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class Base(DeclarativeBase):
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"""Base class for all ORM models."""
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pass
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async def get_db() -> AsyncSession: # type: ignore[misc]
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"""FastAPI dependency that yields an async DB session."""
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async with async_session_factory() as session:
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try:
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yield session
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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finally:
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await session.close()
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async def init_db() -> None:
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"""Create all tables (for dev / first-run). In production use Alembic."""
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from sqlalchemy import inspect as sa_inspect
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async with engine.begin() as conn:
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# Only create tables that don't already exist (safe alongside Alembic)
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def _create_missing(sync_conn):
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inspector = sa_inspect(sync_conn)
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existing = set(inspector.get_table_names())
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tables_to_create = [
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t for t in Base.metadata.sorted_tables
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if t.name not in existing
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]
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Base.metadata.create_all(sync_conn, tables=tables_to_create)
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await conn.run_sync(_create_missing)
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async def dispose_db() -> None:
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"""Dispose of the engine connection pool."""
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await engine.dispose()
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