Database functions?

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I see, looks like you are making some progress. Cron jobs can be a pain to work with, you can actually simulate cron jobs with PHP simply by having scheduled tasks run whenever a user visits the page, a member, guest or even bot wont really matter here. Make sure to check whether the cron jobs should run by comparing datetime string/integer, otherwise you may end up with multiple cron jobs executing at times they really should not.