This is probably no longer necessary, since the UUID is generated on policy creation/update - and the version will be overwritten by the existing event version.

Also, I was wondering if it would make sense to name this function `add_next_cron_events` or something instead, since this adds cron events only from existing events, and does not add cron events to the table upon policy creation?  Alternately, a docstring addition that specifies that this only adds the next occurring event, given the previous event, would be ok too.