All hands on deck!
"certain user accounts on or before 2019," which were were used for staff training and had been inadvertently made public in a GitHub repository ...
So best practice ought to be completely made-up information. Nothing real to lose.
Second best practice ought to be using your company's employee information. Everything to lose, in case of stupidity.
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Hmm, "dog-fooding" is using own pre-release code, before availability generally, to ensure quality. What's the equivalent term here? Using your own identification information in test data, that should never be made available, and to ensure security. "guillotine trimmer loading?"