Error deleting a domain scan

I was doing a domain scan, then ManageEngine froze and gave me back some SQL errors (wish I had to took a screenshot). I had to restart ManageEngine to get the pages again. It then grouped all the Workstations under the domain I was scanning under "Unassigned Workstations".

So,

I scanned again, and it still groups them all under " Unassigned Workstations". So, I thought the domain scan must be bugged from the crash so I tried to delete it and I get this error.

FAILURE :Error occurred while deleting Domain.

Please report the problem to the system administrator, with the Error Code - 1,174,397,224,737.

So I can't delete it, so I thought i'd just edit it to change it to something else then re-add my real domain, but I get this error.

FAILURE :Error while saving the Domain Details. : Cannot delete or update a parent row: a foreign key constraint fails

Please report the problem to the system administrator, with the Error Code - 1,174,397,274,047.

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I've tried restarting the ManageEngine service and the server it sits on.

Any ideas?