for example I've been populating a loli voyeur tag and I'm pretty sure someone's removed it but I can't remember which images I added it to.
All I can think is by populating a pool (then only I can add/remove) to keep track and check later?
edit: and now in populating the pool I think I figured out the culprit https://booru.allthefallen.moe/post_versions?search%5Bpost_id%5D=330957
even more sophisticated it seems using "post_versions" you can search for the addition or removal of specific tags too
for example
KIANER why? :(
Updated