text: from app import db, login
  from datetime import datetime
  from flask_login import UserMixin
  from werkzeug.security import generate_password_hash, check_password_hash
  
  class User(UserMixin, db.Model):
      id = db.Column(db.Integer, primary_key=True)
      username = db.Column(db.String(64), index=True, unique=True)
      email = db.Column(db.String(120), index=True, unique=True)
      password_hash = db.Column(db.String(128))
      save_codes = db.relationship('SaveCode', backref='coder', lazy='dynamic')
  
      def set_password(self, password):
          self.password_hash= generate_password_hash(password)
  
      def check_password(self, password):
          return check_password_hash(self.password_hash, password)
  
      def __repr__(self):
          return '<User {}>'.format(self.username)    
  
  class SaveCode(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      source_code = db.Column(db.String(10000))
      timestamp = db.Column(db.Integer, index=True, default=datetime.utcnow)
      user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
  
      def __repr__(self):
          return '<SaveCode {}>'.format(self.source_code)
  
  
  @login.user_loader
  def load_user(id):
      return User.query.get(int(id))