Your checkout service can survive a bad deploy. It cannot survive a bad migration. A migration that locks the orders table for thirty seconds during a lunch rush is an incident, not a maintenance window — and for digital storefronts selling game codes, gift cards, and mobile top-ups around the clock, there is no such thing as a quiet hour to run one. I work on backend systems behind high-volume digital delivery, including online marketplaces for digital goods like Kadokey , where a single ba...