When you grant someone admin they are automatically added to the staff group. You can create a staff badge and then grant it to them. I sure this can be done via sql too?
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That said, from your question, @ondrej gave a very detailed answer, I understand your question the same way they did, so I would have answered it the same way. If this isn’t the answer you were hoping for, maybe clarify your question a bit more and give detail, that may help in understanding how we can help.