This requires keeping history if, at the time, Buckmaster's account had a certain flag set, because just because the account has the flag now doesn't mean it ha

This requires keeping history if, at the time, Buckmaster's account had a certain flag set, because just because the account has the flag now doesn't mean it had the flag at a certain moment in the past. And even if they had such history, it's not obvious whether they just load all data as-is into training. A totally reasonable pipeline may be unauditable for this purpose.