Deleting initial Admin user - just don't!

I implemented an Elgg install for a client, and the day before launch it seemed prudent to remove myself as admin so that my test data and profile etc didn't display. Simple - login as Admin2 and delete Admin1 - bad, bad, bad!
Doing this completely corrupts the database and kills just about everything.

I can't believe the system allows for this given the catastrophic consequences... my bad too I guess for not backing up db... waiting for webhost to confirm if they have a nightly db backup.