You should be able to edit retired schedules. Currently the only way to edit a schedule is if it is live, which poses a risk that the schedule may run before the changes you need to make are made. For example, I have a retired schedule where I wish to change the calendar used from a Mon - Fri to Tues only, but if I unretire this on a Friday to edit it, the schedule will run straight away, before I am able to update the calendar which would tell it not to run on a Friday.
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