text: from datetime import datetime
  from flaskblog import db
  
  
  class User(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      username = db.Column(db.String(20), unique=True, nullable=False)
      email = db.Column(db.String(120), unique=True, nullable=False)
      image_file = db.Column(db.String(20), nullable=False, default='default.jpg')
      password = db.Column(db.String(60), nullable=False)
      posts = db.relationship('Post', backref='author', lazy=True)
  
      def __repr__(self):
          return f"User('{self.username}', '{self.email}', '{self.image_file}')"
  
  
  class Post(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      title = db.Column(db.String(100), nullable=False)
      date_posted = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
      content = db.Column(db.Text, nullable=False)
      user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
  
      def __repr__(self):
          return f"Post('{self.title}', '{self.date_posted}')"
  