import datetime as dt
from sqlalchemy import Column, Integer, DateTime, Boolean
from sqlalchemy.orm import declared_attr
from sqlalchemy.ext.hybrid import hybrid_property

class CrudMixin:
    id = Column(Integer, primary_key=True)
    created_at = Column(DateTime, default=dt.datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=dt.datetime.utcnow, onupdate=dt.datetime.utcnow, nullable=False)
    is_deleted = Column(Boolean, default=False, nullable=False)

    @hybrid_property
    def is_deleted(self):
        return self.is_deleted

    def mark_deleted(self):
        self.is_deleted = True