How can I clean up the job lists in ColorProof?

Problem:

The ColorProof job list contains ghost jobs, which cannot be deleted.
You want to make the database size smaller.
You want to delete all jobs (from the job list and from the history).

How to clean up the job lists in ColorProof:
Fully close ColorProof, including the tray icon in the task bar.
Navigate to: C:\Program Files\GMG\ColorProof05 > double click dbsetup.exe > Service Functions >
Select 'Delete all Jobs':