The v1.4.35/v1.4.36 read-swap gated on a global `COUNT(*) > 0`
against `measurement_rollups`. A user with BP fully rolled up who
logged their first WEIGHT measurement saw the per-write hook upsert
one WEIGHT DAY bucket, the global probe flipped to true, the read
path picked the bucket-derived branch for WEIGHT, and the all-time
WEIGHT count collapsed to whatever the trailing 90d narrow aggregate
plus the single fresh bucket could reconstruct.
The new shared probe in `rollup-coverage.ts` joins distinct
measurement types against the rollup table per user and surfaces
`{ type, has_buckets }` rows. Both `computeSummariesSlice` and
`buildComprehensiveAggregate` take the rollup-derived branch only
when every type the user has logged is covered; partial coverage
falls back to the live aggregate so the brand-new-type case stays
correct. Integration test seeds BP rolled up + WEIGHT raw-only and
asserts the WEIGHT summary count matches live SQL.
Marc-André Bombeck
07491df6b2