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MDL-29847 question preview: garbage collect old preview data.
This adds cron code which looks for question previews that have not been touched for more than 24 hours, and deletes them. We try to delete previews immediately. For example if the user clicks start again, then we immediately delete their previous preview. However, we can't do that if they just close the preview window. Hence we need some cron code to clean up old preview that have got left lying around. Normally, this code will not have much to do, so it will be very fast, so we can afford to run it every cron. This has been implemented in such a way that in future it will be easy to add other cron code to the question bank. Sadly, to make this work on MySQL, we require a horrible hack in the already hacky delete_usage_records_for_mysql function.
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