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 missing content so it is not lost forever?