The wmf.mediawiki_history table, documented here, seems to not be MCR-aware. A naive implementation would be to add a revision_slot_id column, which should be compatible with the current use of MCR in which each revision only modifies one slot, but might be a bad fit for the slots schema in the long-term, if we'll eventually allow edits to multiple slots' content in a single revision.
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Adding missing Multi-Content-Revisions code project tag as Platform Team Initiatives (MCR) team tag is archived and its parent Platform Engineering team does not exist anymore
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Herald woke up and decided to tag our team on this one due to the WBMI tag, I think - given this only has to do with MCR itself and not any of our products, I'm gonna Boldly remove the tags.