https://www.icyphoenix.com/viewtopic.php?f=1&t=6739&p=46654#p46654
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Mighty Gorgon
Wed 23 Dec, 2009 13:20

Re: Site Updated To Latest SVN Version
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You need to convert your forums and categories tables after having upgraded the DB, and then empty the cache.

Unfortunately that feature will only work if you disable sessions in install.php.

I still need to check how that code works and see if I can attach that function to the DB update without compromising the rest.