I found the editing functions of the Manually Add a Deep-Sky Object lacking. Specifically how to delete an entry.
It would good to have a list of custom object, similar to how flags are organized in the future.
For now, is there a file I can Edit/Delete to remove my added object(s)?
I emailed Akarsh who introduced this feature to see if he has time to add edit/remove functionality. Right now, you have to edit the userdb.sqlite file directly which is of course not the right way to do this.