Is there any way to see constraints in DB schema? Maybe it's there, I just don't know how to read it.I assume we don't want user to create bunch of identical UMOs on each update if no changes were made to the UMO. Also what if(theoriticly speaking) 2 users create exactly the same UMO or make exactly the same versioned change to UMO(like fixing an obvious syntax error by the original author)?