my point is basically this: when the code in your application interacts with the DB, and it encounters a (runtime) error from a mismatch between the app's under

my point is basically this: when the code in your application interacts with the DB, and it encounters a (runtime) error from a mismatch between the app's understanding of the DB schema and the DB's understanding of the DB schema, is that error handled gracefully? if yes, good! if no, because the app code assumes this is somehow impossible, that's a problem. that's all.