app/db/base.py

from sqlalchemy.ext.asyncio import AsyncAttrs, AsyncSession, create_async_engine
from sqlalchemy.orm import DeclarativeBase, sessionmaker
from app.core.config import settings


class Base(AsyncAttrs, DeclarativeBase):
    pass


engine = create_async_engine(
    settings.database_url,
    echo=settings.debug,
    pool_pre_ping=True,
)

async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)


async def init_db():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def get_db():
    async with async_session() as session:
        yield session