from datetime import datetime

from sqlalchemy import Column, DateTime, Integer
from sqlalchemy.ext.declarative import declared_attr


class Base:
    id = Column(Integer, primary_key=True, index=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    @declared_attr
    def __tablename__(cls) -> str:
        return cls.__name__.lower()