Database/__init__.py

from sqlalchemy.ext.asyncio import create_async_engine,AsyncSession
from sqlalchemy.orm import sessionmaker
from .models import Base

DATABASE_URL = "sqlite+aiosqlite:///./chat.db"

engine = create_async_engine(DATABASE_URL,echo=True)

AsyncSessionLocal = sessionmaker(
    bind=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 AsyncSessionLocal() as session:
        yield session