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    This is why you should design DB-out and not application-in.

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      I wrote the article so I obviously appreciate the value of database level constraints over or in addition to application level constructs, but I’d still classify my preferred design as “application-in”. While developing features I’m constantly thinking about schema, but I try not to jump directly to it. However, when it’s time to write some migrations I try to be much more forward thinking than “what does the app need right now”, specifically in regards to constraints or obvious performance issues.