Flask-SQLAlchemy use abstract

flask_models.py

class BasicModel(db.Model):
    __abstract__ = True

    created_at = db.Column(db.DateTime, default=db.func.now())
    updated_at = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())


class User(BasicModel):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    username = db.Column(db.String(64), unique=True, index=True)