rawlinp commented on issue #3893: Add a database constraint preventing 
assigning Servers from one CDN to a DeliveryService on a different CDN.
URL: https://github.com/apache/trafficcontrol/issues/3893#issuecomment-527981579
 
 
   If adding a DB constraint means existing DB violations would make the DB 
migration fail, then yeah I don't think we can just add a DB constraint. We can 
however prevent _new_ DB violations via the API. That wouldn't hold the upgrade 
hostage over the DB state. Or, we in the migration we could just delete the 
_invalid_ assignments before adding the DB constraint. Either way, I agree it 
should be discussed on the mailing list. 

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