old_contents: from django.conf import settings
  from sqlalchemy import create_engine
  from babbage.manager import JSONCubeManager
  
  engine = create_engine(settings.DATABASE_URL)
  models_directory = 'models/'
  
  cube_manager = JSONCubeManager(engine, models_directory)
  
new_contents: from django.conf import settings
  from sqlalchemy import create_engine
  from babbage.manager import CachingJSONCubeManager
  
  engine = create_engine(settings.DATABASE_URL)
  models_directory = 'models/'
  
  cube_manager = CachingJSONCubeManager(engine, models_directory)
  
subject: Use CachingJSONCubeManager