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As a PRTG user, I want to see who made changes in an object's history even when the user no longer exists.
Details of user story
The "History" tab shows when, who and what changes were made to an object. However if the user who made a change no longer exists, the User is shown as "Unknown". It's good security practice delete uses who are no longer needed however doing so loses this important audit trail.
Users can be deleted but their name should still appear in the object history.