Notification of deletes

This page is a capture in the next bucket of the product backlog — a pre-sprint idea, not yet pulled into a sprint as a story.

At present it is easy to see new rows or modified rows in an entity dialog. It is not possible to see deleted rows. One way to do this is to preserve state from before reload by key. Any entities which are not present after reload can be shown as red. History then allows users to re-instate deleted entities.