Hi, as I use the excellent package org-id in a somewhat non-standard way, I tend to produce IDs, that are not referenced from anywhere. Org-id handles this great and does not suffer in performance, but eventually I want to remove those unreferenced IDs. Therefore I have written a small interactive assistant:
https://github.com/marcIhm/org-working-set/blob/master/org-id-cleanup.el to help with removing those IDs. The assistant (interactive function: org-id-cleanup) is quite detailed with its instructions and checks, so that the risk of doing harm ist reduced to a minimum, although not to zero (therefore the first step is to ask for a backup). In any case I wonder, if this functionality (removing unreferenced IDs) could be helpful for anyone else. So please feel free to have a look. Finally I would be grateful for any comment whatsoever (e.g. regarding the name of org-id-cleanup.el). Best regards Marc