Restoring backup has no effect

[njoseph]

Looks familiar.

MediaWiki content gone, "History" shows DBQueryError

I had a MediaWiki site and sometime recently (last week?) the content disappeared. When I click on History I see the following information: A database query error has occurred. This may indicate a bug in the software. … Fatal exception of type “Wikimedia\Rdbms\DBQueryError”` Note that this was before I updated to v. 21.7 (see Upgrade to Bullseye - #22 by dgj), although it appears to be a very recent issue. Any help with solving the issue? Also, is there any way to locate and backup the mis…

But then, DBQueryError is a common error that could be caused by various reasons. The same fix might not work for you.