from datetime import datetime
from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
from sqlalchemy import ForeignKey

engine = create_async_engine("sqlite+aiosqlite:///tasks.db")
new_session = async_sessionmaker(engine, expire_on_commit=False)

class Base(DeclarativeBase):
    pass

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

async def delete_tables():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)