In that case, since  no schedule was defined, the default setting of stats_refresh_time being 300 minutes form midnight, or 5:00 AM, got converted to stats_refresh_schedules with value being ['0, 5, *, *, *'] when admin-ui was launched.    Also @time_last_run was unconditionally initialized at that time.  So that admin-ui starts stats collection at 5:00AM every day, and  this is exactly the same behavior as before.