old_contents: # -*- coding: utf-8 -*-
  
  from flask.ext.cache import Cache
  
  __all__ = ['cache']
  
  cache = Cache()
  
new_contents: # -*- coding: utf-8 -*-
  
  from flask.ext.cache import Cache
  from flask.ext.sqlalchemy import SQLAlchemy
  
  __all__ = ['cache', 'db']
  
  cache = Cache()
  db = SQLAlchemy()
  
subject: add database extension