Dates in "Standard" and "Extended" calendars stay in ujo_calendar table until calendar is updated in autocal_asc and resaved.
Special case for "Extended" calendars is if Scheduler has no more run-dates, it will trigger regeneration in ujo_calendar for the next 365 days.
If today is beyond the last day in the ujo_calendar table for this particular calendar, new dates will be generated.
An "Extended" calendar is updated 365 days in advance from last save.
"Standard" calendars will only show dates defined in autocal_asc.