Statistic fields validations cause support pain, because we throw Exceptions without providing a way to clean the data up. Tasks

1. Check all our DAOs, fall back to reasonable values where possible. None for column constraints, issue count for estimation statistic, etc.
2. Warn instead of throwing an error
3. Test that we can run GH with only the rapid view table configured (manually delete all other AO tables), and ensure that GH won't blow anywhere, and that we can use the configuration to bring GH back into a consistent state