api/db.py

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

from api.config import get_settings


class Base(DeclarativeBase):
    pass


def _make_engine():
    settings = get_settings()
    return create_async_engine(
        settings.DATABASE_URL,
        pool_size=10,
        max_overflow=20,
        echo=False,
    )


engine = _make_engine()
AsyncSessionLocal = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)