old_contents: from flask import Flask
  
  app = Flask(__name__)
  app.config.from_object("config')
  
  from application import views
  
new_contents: from flask import Flask
  from sqlalchemy import SQLAlchemy
  
  app = Flask(__name__)
  app.config.from_object("config')
  db = SQLAlchemy(app)
  
  from application import views, models
  
subject: add db initializer