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According to TFA (which apparently nobody reads) it most certainly was an engineering mistake. Files in long-term storage were accidentally subject to the same code that deletes files in short-term (30 day) storage.

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It's sound similar to "junior dev had access to prod database" scenario which really isn't engineering mistake but process/administration.

It seems more likely that there was some process that performed a "delete older than 30 days" on the long term storage. Likely untested code. That's what the article says anyway, and we all know that the public message is always the best spin on a scenario.

I knew a guy who used a different color scheme for terminal sessions connected to production servers, so he didn’t do something in the wrong window.

A guy. One. How many people have I met with shell access to production servers?

I have all hosts share the same .zshrc and config with yadm, so all terminals look the same and share keyboard shortcuts. My oh-my-zsh with powerlevel10k is configured in a similar way: when I'm connected by ssh to a host it shows hostname@domain or hostname@ip on RIGHT side of a screen. It's not much, but it's easily visible, sometimes even annoying, but at least I never deleted wrong docker images from dev :)

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