The wait and perfmon baselines stop counting every restart's fabricated zero as a quiet sample: interval-honest successor aggregates replace the legacy pair in place, the provider reads whichever supply covers its window and gates the LAG heuristic on a NULL interval, the legacy pair retires by a self-executing coverage condition, the startup backfill reads coverage off the materialization, and the Daily-routed calendar answers its unmaterialized days from raw (partial #3653: A6 + A10 mechanical half) - #3698