cron jobs are good when everything is quiet and steady... you can store as many informations as you want when nothing move...
but if you have posts that are deleted or moved or moderated, etc... that makes a lot of things to check...
btw, a single query takes something like 0.003sec. to execute... the query itself is not a problem... the serverload for such feature is taken into consideration when you have a popular board, but it is not the only feature you have to take care of... like the "mark forum as read" is more server intense...
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