Surely any schema changes would be going through QA first? Assuming software development lifecycle of DEV, TEST, QA, Production is being used. What's the lead time between schema changes going into QA and schema changes going into production? Does it matter if the QA data doesn't get refreshed in that interim period?
MARCUS. Why dost thou laugh? It fits not with this hour.
TITUS. Why, I have not another tear to shed;
--Titus Andronicus, William Shakespeare