We're trying to update a schema file. We're getting a validation failure. What do we do? After fixing up the code so it doesn't just backtrace, we find there's bad data in one of the portfolios. But which one? I'm probably going to patch out the check. We have to be able to update the schema. If we had enough information to fix whatever data is bad, we'd do it. But otherwise I don't see what we can do other than ignore it and wait for a student to complain.