IssueTracker is now able to "delete" issues. They will not really be deleted for several reason but set to status deleted. Within configuration a special status parameter can be set to e.g. deleted. That means all issues having this status will not be displayed anymore and not appear within statistics. They can still be accessed directly by their ID, keeping their modification log and will be listed only if the status filter contain this special status.
It is to be taken care that only one special status can be defined.