Some read routes cut their windows in SQL against the database's now(),
which a pinned Date cannot reach; a walk pinned to a fixed date then reads
less of its record every day the calendar moves on. relativeToAnchor writes
every instant and day key of a snapshot relative to the start of the
current UTC day, so a walk can lay its record out from today and still read
the same snapshot on any day.
The series walk uses it with the clock unpinned; the analytics walk pins
the clock to noon of today, keeps its account in UTC and is re-recorded in
that form (its earlier snapshots proved the builder move before this
change).
A parity walk over GET and POST /api/measurements: every create arm (single, combined, named sleep stage) with its duplicate and refusal, a bridge token, a delegated write, and every list mode. Sealed bytes are recorded by length, since each write carries a fresh nonce.
tests/kit/parity.ts pins what a route answers, stores and reports for a
fixed walk of cases, so the code behind it can move under a byte-for-byte
comparison: the response, the rows read back, the request's wide event and
the queue and arrival tails it asked for, with generated ids, server
timestamps and request ids replaced by stable placeholders.
The first walk covers POST /api/measurements/batch: a mixed first sync with
every per-entry refusal, the same sync again, a background day total, the
manual and HealthKit mirror merge, a backfill, both whole-batch refusals and
a narrow bridge token. The clock is pinned, so the snapshot holds on any day.
Marc-André Bombeck