Removal of tickets in NSP is normally a soft delete, ticket is set with status 0, meaning it remains in database but is not handled by application in any way.
To definitive sort out tickets and remove all resources (tasks, worklogs, call logs, attached files and relations to tickets, CIs, articles, etc.) permanently the Hard Delete functionality can be used. Tickets are removed from the database and cannot be recreated.
Removal is running in a background procedure scheduled with script. It is recommended to run the procedure during night. Hard Delete works with use of a new entity property Marked for deletion, that can be activated for ticket manually or by trigger. When value is TRUE the procedure will delete the ticket.
If you need this function, contact NSP Support (nspsupport@nilex.se) for more info.