position = Column(Integer, nullable=False)
author_user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
posted_time = Column(DateTime, nullable=False, index=True, default=datetime.now)
position = Column(Integer, nullable=False)
author_user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
posted_time = Column(DateTime, nullable=False, index=True, default=datetime.now)