QA F-M-04 (v1.4.39): the wall-clock-anchored seed planted rows from
`nowMs` backwards, packing 6 000 rows × 15 min = 62.5 days starting
from "right now". Once the route's live-fallback cap is in effect,
the seed slides past the cap as time passes; under the old 90-day
cap the failure threshold was 28 days post-seed. Re-anchor the youngest
row to `nowMs - 30 * 86_400_000` so the seed always lives ~30-92 days
ago regardless of when CI runs the test.
The per-type loop inside `buildAnalyticsResponse` calls
`fetchMeasurementSeriesChunked` without a `since` filter, so a single
default-slice request pulls every measurement ever for the user across
15 chunked rounds. The v1.4.38.8 per-type fast-path gate made this
unreachable in the common case, but a regression on those gates would
re-trigger Marc's 74.6 s cold full-slice mount.
- Add `ANALYTICS_LIVE_WINDOW_DAYS = 90` + `liveSince` constant.
- Thread `since: liveSince` into every per-type chunked read.
- Annotate `meta.analytics.bp_aggregate.live_since` (ISO) so the next
perf-verify can prove the cap is in effect on a live request.
Defense-in-depth only — the rollup fast-path is unchanged because it
never reaches the per-type loop. Worst-case bound drops from ~347 k
rows to ~5 k rows on Marc's tenant (matching the
comprehensive-aggregator + summaries-slice 90-day windows).
Trade-off: `summarize().avg30LastYear` returns null on the fall-through
path; the dashboard's year-over-year overlay shows "no prior data"
until the rollup tier warms. Acceptable on a degraded path that
v1.4.38.8 already made rare.
Tests: new `src/__tests__/api/analytics/since-cap.test.ts` pins the
90-day floor on every per-type findMany, pins the `live_since`
annotate, and pins that the slim slice is untouched. Existing chunked
paging integration test reseeded with timestamps inside the 90-day
window so it still exercises the two-chunk boundary.
Reviewer note: src/app/api/analytics/route.ts fanned out 17+
unbounded prisma.measurement.findMany per request — growth linear
in HealthKit-days. Replace with prisma.groupBy where possible;
chunked-paged with take=5000 where running-window slope or paired
correlations require row-level access. Wide-event annotation
analytics.bp_aggregate.row_count for slow-query attribution.
Fixes: Sr-H1 (Wave-6 v1.4.23 senior-dev review)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Marc-André Bombeck