What I would say, if I could rephrase, is this: Sure some shockingly-behind-the-times companies exist, and may even be a non-negligible percentage. But I'm sur

What I would say, if I could rephrase, is this: Sure some shockingly-behind-the-times companies exist, and may even be a non-negligible percentage. But I'm surprised this is is front-page HN because I assume that the engineers on this website know that you don't need downtime for a DB migration. It feels very common-knowledge among this community.