For the record, I've now permanently removed the page Special:RecentChangesLinked since it's unimportant and not worth the trouble of filtering bot requests. I also removed some ugly temporary measures. The wiki works right now and I'm crossing fingers for that to last this time.
While at it, I also upgraded the server OS and Mediawiki, and I disabled the visual editor because it didn't really work (a contribution to <https://gitlab.com/jeanas/LilyWiki> to make the <lilypond> tag nicely editable in the visual editor would be welcome). Please let me know if you see anything not working correctly.
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