Here is the full error I got:
[34379a2251de55946be9b14c] Caught exception of type Wikimedia\Rdbms\DBQueryError
Description
Description
Event Timeline
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It happens when I add wikitext, I am trying to do this on https://messengergeek.miraheze.org/wiki/Talk:Main_Page
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It's because of "Error: 1406 Data too long for column 'ref_src_wiki' at row 1", dosen't appear to be a fallout from the mw 1.34 upgrade as we've seen that in the log before. It just means your wiki name is big. Flow will need to be fixed to support large wikidb names.
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How long can the wiki name be before it errors out? Also would it be possible to shorten the db name so flow would work?