Maintenance Page
This is a tab for Admin-only users and is used for the manual deletion of Jira issues and worklogs. In general, access to this page is not required, however, in case the system fails to remove deleted Jira issues or Worklogs during the synchronization, the admin could do it manually here.
In Configuration → Issues → Maintenance page, the admin could search for issues and worklogs that should be removed manually from the database: