Deletes all miniatures + scan history for this library. Box categories are kept.

Marks any scan runs stuck on "in progress" as failed. Miniature data is untouched.

Re-matches MyMiniFactory images/links for items that missed out (e.g. while the API key was broken). Only touches those two fields.

Re-runs creature matching for still-unconfirmed items (e.g. after a matcher upgrade). Only touches items with no confirmed match yet.