An important part of this (that I've still not really figured out) is, if you're pushing much of your validation in the DB, how & where to interpret the differe

An important part of this (that I've still not really figured out) is, if you're pushing much of your validation in the DB, how & where to interpret the different validation errors you might receive, and pass back through your application for turning into friendly messages, highlighting formfields, etc, etc.