Oh no, it’s far worse than I feared. That last failed 3.6.x to 3.7 update followed by 3.7.1 bug fix has resulted in even greater damage than I feared. Not only do I still have to rebuild the social media and comment notification functionality, but I see now that all internal media and file links have been reconfigured somewhere – so all the links are broken in 13 years worth of content, some 3 or 4000 posts and more. Bastards. Effing bastards.