If I try to close threads on snapwikiwiki, I get the following error but the thread actually gets deleted-
A database query error has occurred. This may indicate a bug in the software. [6407ea4aeb1174c8b06d3978] 2020-10-30 14:17:14: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"
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I am unable to reproduce this on TestWiki.
Related to T6255: Wikimedia\Rdbms\DBQueryError when closing or deleting WikiForum thread.