Longer string columns for Trait and UniqueNames

UUID's are larger than the 32 columns previously allocated. Bumped to 255.
Arguably could have gone larger but we should be aware of long strings since
we're going to have so many Events.

Change-Id: Ib3785e3546ee77937d5a63691a9ae1dc16147c37
Merge "Longer string columns for Trait and UniqueNames"