A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
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That was a fun one to fix. The upgrade script hadn't run for it because its DB had been locked due to excessive spam. The DB locking had been done via [[Special:LockDB]] rather than by setting $wgReadOnly in the wiki's settings file, so I had to move the lockfile temporarily out of the way in order to be able to run update.php.
Thanks for reporting this!