At Zammad, we pay close attention to audit compliance and GDPR.
For this reason, tickets and/or users can only be deleted by administrators based on rules or within the scope of GDPR deletion requests.
The deletion of single entries/articles in tickets is only possible by database command from an administrator on the console and is expressly not recommended.
As an administrator, you can create Scheduler automations to delete tickets/users.
These options can be found under the Admin Interface > Settings (gear icon / bottom left) > Manage > Scheduler.