Observability & operationsMediumSDE-2

You need to rename a column in a 500-million-row Postgres orders table that is written 2,000 times a second, with no downtime and with the ability to roll back the app at any time. How do you do it?

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RazorpayStripeZerodha

Think first

Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.

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