Measurement upserts in /api/sync/changes carry appleHealthMirror. A new
measurementMirror domain delivers { id, appleHealthMirror } for the live
readings of every token whose setting changed past the cursor, keyed on
(token.mirrorChangedAt, measurement.id). Switching the setting writes the
token row only, so the readings keep their updatedAt and syncVersion and
nothing keyed on them recomputes. The domain is additive inside the v2
cursor and is left out of the retention expiry, since its watermark is a
setting's age, not a deletion's.
The multi-domain feed at GET /api/sync/changes read cycleDayLog and
menstrualCycle without consulting the module gate, so an account with
cycle tracking off still received period days and per-day symptom rows
over the same token that every /api/cycle/* route refuses with a 403.
Resolve the cycle module once per request and skip both queries when it
is off, rather than filtering after the read. The blocks come back empty
and the request still succeeds: the feed multiplexes five domains over
one cursor, so refusing it outright would wedge measurement, mood and
intake catch-up for every account that has cycle tracking off. The two
cycle watermarks stay untouched while the module is off, so re-enabling
resumes where the client left off.
A client that synced cycle rows before the module was turned off keeps
its stale local mirror. Tombstones would be the wrong signal there --
they mean deleted, and disabling a module must leave the rows intact --
so purging a paired mirror needs an explicit signal in the feed contract
and is left for a coordinated contract cycle.
Wire shape unchanged.
Marc-André Bombeck