Hello,
In the documentation of $wgDBprefix [0], it has been explicitly mentioned
that you should not set this if you're using Postgres as your DBMS since
2006.
We are depending on this assumption on new places now [1] and if you set
this, please unset and fix your database ASAP otherwise you end up with
some tables that have the prefix and some that don't which I assume
wouldn't be really fun.
Thank you for your understanding
[0]:
https://www.mediawiki.org/wiki/Manual:$wgDBprefix
[1]:
https://gerrit.wikimedia.org/r/c/mediawiki/core/+/595316#message-9c1b408f7b…
Best
--
Amir (he/him)