I recently updated a site from EE 2.2 (I think) to 2.7.2.
Somewhere along the way, the categories and groups went missing, but not the category associations for each entry.
(The person who was holding the backup of the DB seems to have misplaced it, otherwise I'd just pull it from there. I'm hoping it will still turn up...)
Is there a way to recreate the category structure based on the information in the entries?