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i once spent a whole week refactoring an entire microservice JUST bc someone forgot to add a composite index on a high-traffic table. you can rewrite logic in an afternoon, but migrating a billion rows of production data is a __death sentence_

the nightmare part is usually when people forget about concurrency control and deadlocks. you can have the prettiest schema in the world, but if your transactions are locking up the whole system, no amount of clean code will save you.