Test post to verify migration to App Engine High-Replication Datastore worked OK
The App Engine console is a paragon of crapness at the best of times, but the functionality to do a migration from the old master/slave datastore is in a class of its own.
Hopefully I'll only have to do this the once - at least for this blog, I've still got a bunch of other apps that in theory should be migrated, although a number of them don't actually use the datastore, so fingers-crossed I can just leave them as-is.