I don't see data of these two tables(Dialer_Detail and Termination_Call_Detail) are directly exposed via any API. However, I see these two API to track status of contacts or campaign:https://<server>/unifiedconfig/config/campaign/<campaign-id>/import...

These two SkillGroups are already assigned to one of the Campaign named skillGroupCampaign. You can see this Campaign through Configuration Manager.

You can permanently delete these deleted object via configuration manager. Open Configuration Manager -> Miscellaneous Tool -> Deleted Objects. Select Campaign > Select All -> Delete Permanently