Problem with deleting cache from app_controller / model

I have a core few functions that add / edit / delete records in app_controller.

 

Now when I add / edit / delete a record it will not delete the cached file. I even tried using the afterSave() afterDelete() in the respective model for each, even hardcoded the

Cache::delete( ‘all_tests’, 'week'); but nothing seems to delete these files.

 

I am able to make a cached record from app_model but cant delete them from app_

 

Is there a reason it will not work in app_? Something I am missing?

 

Dave