text: from NAS_Family import db, login_manager, app
  from flask_login import UserMixin
  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)
      email = db.Column(db.String(200), unique=True, nullable=False)
      access_code = db.Column(db.String(200), unique=True, nullable=False)
      password = db.Column(db.String(200), nullable=False)
  
      def get_reset_token(self, expires_sec=900):
          s = Serializer(app.config['SECRET_KEY'], expires_sec)
          return s.dumps({'user_id': self.id}).decode('utf-8')
  
      @staticmethod
      def verify_reset_token(token):
          s = Serializer(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.id}', '{self.email}', '{self.password}', '{self.access_code}')"
  