Noting this report from enwiki in case it's interesting.
I attempted to created a redirect page titled Expected Mean Square. Repeatedly I tried to save it, and every time I got this error message:
A database query error has occurred. This may indicate a bug in the software.
[e6ace71c-ae3f-4171-8639-3e1554cba7dd] 2020-08-19 23:44:49: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"
Can anyone explain this? Michael Hardy (talk) 7:46 pm, Yesterday (UTC−4)
And now I have succeeded in creating the redirect. Michael Hardy (talk) 8:08 pm, Yesterday (UTC−4)