text: from flask.ext.sqlalchemy import SQLAlchemy
  db = SQLAlchemy()
  
  
  class User(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      username = db.Column(db.String)
      password = db.Column(db.String)
  
      def __init__(self, username, password):
          self.username = username
          self.password = password
  