You ought to be able to list statuses that mean "open" and "closed" in the admin section.
Closed status should be displayed as red in the ticket list screens, open status should be displayed as green. The same should apply to the ticket view.
I think this could be implemented UI wise as a simple list of closed and open statuses in the admin.
Performance wise we should consider how much cost the related lookups will be, and make sure that we don't lose ticket list performance due to this.
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