Iss #69 - Fixed issue where validation messages could be lost

There was a very rare issue where spam inserting could cause issues
where sometimes a message was dropped when attempting to validate too
quickly. This was caused by manual FK management. Updates were done to
the status dto to tell Hibernate to manage the entity relations for us
using cascade + orphan removal.

Additional fixes were made to reduce the churn of objects with repeated
requests by reusing old validation messages if they already existed.