new_contents: from confess.models import db
  from sqlalchemy.orm.exc import NoResultFound
  from datetime import datetime
  
  class Comment(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      post_id = db.Column(db.Integer, db.ForeignKey('post.id'))
      message = db.Column(db.Text)
      timestamp = db.Column(db.DateTime)
      upvotes = db.Column(db.Integer)
      downvotes = db.Column(db.Integer)
      replies = db.relationship(
          'Comment', backref=db.backref('parent', remote_side=[id]),
          lazy='dynamic')
subject: Add model