From [[ https://www.mediawiki.org/wiki/Thread:Project:Support_desk/update.php_1.19_-_1.23.7 | Support Desk ]]:
Hi. I am having problems upgrading my mediawiki instance. SO far I have: replaced all files with 1.23.7 files,
added back a couple of custom lines for auth, upgraded all extensions to 1.23 and removed unsupported ones
and then tried to run php update.php. The script connects and then fails shorty afterward on
Error: 1054 Unknown column 'page_content_model' in 'field list'. Does anyone know where this table gets created?
And this reply:
Sorry, I don't know. But you at least are not the first and only person, who has this problem. I found a number of hits
for this problem on Google. Maybe they bring you to the right idea?
Link from reply: https://www.google.de/search?q=%22Error:+1054+Unknown+column+%27page_content_model%27+in+%27field+list%27.%22