text: from APP import db, login_manager
  from flask import current_app
  from flask_login import UserMixin
  from datetime import datetime
  from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
  
  
  @login_manager.user_loader
  def load_user(user_id):
      return User.query.get(int(user_id))
  
  class User(db.Model, UserMixin):
      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)
      logs = db.relationship('Log', backref='author', lazy=True)
  
      def get_reset_token(self, expires_sec=1800):
          s = Serializer(current_app.config['SECRET_KEY'], expires_sec)
          return s.dumps({'user_id': self.id}).decode('utf-8')
  
      @staticmethod
      def verify_reset_token(token):
          s = Serializer(current_app.config["SECRET_KEY"])
          try:
              user_id = s.loads(token)['user_id']
          except:
              return None
          return User.query.get(user_id)
  
      def __repr__(self):
          return f"User('{self.username}','{self.email}', '{self.image_file}')"
  
  class Log(db.Model):
      id = db.Column(db.Integer, primary_key = True)
      comment = db.Column(db.String(500), nullable=False)
      event_datetime = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
      location = db.Column(db.String(50), nullable=False)
      user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
  
      def __repr__(self):
          return f"Log('{self.location}', '{self.event_datetime}')"