old_contents: from flask import Flask
  from flask.ext.sqlalchemy import SQLAlchemy
  
  
  app = Flask(__name__)
  
  # load configuration file
  app.config.from_object('config')
  
  # database initialization
  db = SQLAlchemy(app)
  
new_contents: from flask import Flask
  from flask.ext.sqlalchemy import SQLAlchemy
  
  
  app = Flask(__name__)
  
  # load configuration file
  app.config.from_object('config')
  
  # database initialization
  db = SQLAlchemy(app)
  
  from app import models
  
subject: Add import models to app