app/storage/db.py

"""SQLAlchemy async engine + session factory."""
from __future__ import annotations

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

from app.config import get_settings


class Base(DeclarativeBase):
    pass


_settings = get_settings()
engine = create_async_engine(
    _settings.database_url,
    echo=False,
    pool_pre_ping=True,
)
SessionLocal = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)


async def get_session() -> AsyncSession:  # type: ignore[misc]
    async with SessionLocal() as session:
        yield session