Add the menstrual-cycle phase as a channel in the existing FDR-guarded
correlation machinery, the same way rated mood factors were folded in —
no new statistics, the same Welch + Benjamini-Hochberg pipeline, the same
day floors and q = 0.10 gate.
Two complementary mechanisms, both confined to a gender-gated surface:
- a categorical luteal-vs-follicular contrast per outcome metric (resting
heart rate, HRV, sleep, steps, weight, basal/wrist/skin temperature),
surfacing one headline finding (resting-heart-rate-by-phase, falling
back to HRV); and
- the continuous phase ordinal folded into the lagged-Pearson matrix.
Phase never reaches the general correlations route — the temperature
channels held out of the general matrix are un-blocked only here, behind
the cycle gate, so a reproductive inference can never leak onto a
non-gated surface. Every row shows n, effect size, p and q; nothing is
fabricated on thin data and nothing is framed as causal.
Surface it through a new gated GET /api/cycle/insights and a drop-in
card that mirrors the mood-factor crosstab.
Add a cycle dimension to the Coach snapshot: current phase + day-of-cycle,
the next predicted event (period range + confidence + method, fertile
window goal-gated), and the headline phase finding — present only for a
cycle-enabled account, so a non-cycle snapshot is unchanged. A new ground
rule keeps the Coach descriptive: never contraception-grade, never a
"safe day" claim.
OpenAPI regenerated; phase-correlation + snapshot-inclusion tests added;
copy localised across all six locales.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add the `/api/cycle/*` capture, calendar, history, and settings routes
plus the offline-sync delta extension for the v1.15 cycle-tracking
feature, all against the locked iOS contract.
- Enable flag: add nullable `cycleTrackingEnabled` to CycleProfile
(migration 0132). A null toggle derives from gender (FEMALE → on).
`isCycleEnabled()` is the single gate resolver; every `/api/cycle/*`
route 403s `{ errorCode: "cycle.disabled" }` when off. The resolved
flag surfaces additively on GET /api/auth/me.
- Routes (apiHandler + Zod + envelope + gate + annotate + auditLog):
POST/PATCH/DELETE day-logs (single), POST day-logs/bulk (idempotent,
capped 500, rate-limited 60/min, per-entry inserted/updated/duplicate/
skipped), POST period boundary, GET calendar (runs the deterministic
engine, debounced stale-while-revalidate cache, goal-gated fertile
window), GET cycles (history + median/MAD stats), GET profile,
DELETE cycles, PATCH /api/auth/me/cycle-prefs (deep-merge).
- Day-log note encrypts at rest (notesEncrypted); intent fields stay
queryable plaintext. Upsert keys on (userId, source, externalId) when
externalId present, else (userId, date).
- Offline sync: extend GET /api/sync/changes + the cursor with the
`cycleDays` + `cycles` domains (CURSOR_VERSION → 2). cycleDays
tombstones key on externalId else id; cycles on id.
- OpenAPI: register every route + DTO; regenerate the committed spec.
- i18n: cycle prediction disclaimer across all six locales.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Pure, DB-free cycle prediction and phase-assignment engine under
src/lib/cycle/. The math mirrors the offline-parity spec exactly so the
server and the native client compute byte-identical forecasts from the
same canonical inputs.
- day-math: noon-UTC anchored YYYY-MM-DD arithmetic (dayDiff, addDays,
round-half-up) that stays stable across timezones and DST transitions.
- prediction: robust median+MAD cycle-length estimator over a trailing
12-cycle window with 3-MAD outlier exclusion and missed-log detection;
period-length estimator; one-sigma Low/High date band widened by
logging sparsity; luteal back-calculated ovulation + six-day fertile
window; the CALENDAR -> symptothermal -> temperature-trend method
ladder (sensiplan 3-over-6 + mucus-peak re-implemented from the
published method) with documented blend precedence; a multiplicative
confidence scalar shrinking with length variance, low cycle count, and
sparse logging.
- phase: day-of-cycle -> MENSTRUAL/FOLLICULAR/OVULATORY/LUTEAL boundary
mapping with menstrual precedence on overlap.
- 48 unit tests covering the regular, irregular, cold-start, outlier,
symptothermal, temperature-trend, and every phase-boundary case; all
assertions are timezone-independent and pin exact dates + confidence.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Introduce the persistence layer for cycle tracking: eight enums
(CycleTrackingGoal, FlowLevel, OvulationTest, CervicalMucus,
HomeTestResult, ContraceptiveKind, CyclePhase, PredictionMethod) and
seven models.
CycleProfile is a 1:1 per-user settings row (lazily upserted on first
access via getOrCreateCycleProfile). MenstrualCycle and CycleDayLog are
the capture rows, carrying the MoodEntry soft-delete + syncVersion shape
so they ride the sync delta feed; CycleDayLog repeats the MoodEntry
dual-unique — the canonical (userId, date) key plus the NULL-distinct
(userId, source, externalId) key for HealthKit re-ingest. Free-text
notes encrypt at rest; queryable physiology (flow, BBT, OPK, mucus,
dates) stays plaintext for the rollup and correlation tier. The symptom
taxonomy (CycleSymptomCategory / CycleSymptom / CycleSymptomLink) clones
the mood-tag trio and seeds fifteen symptoms across three categories
with cycle.symptom.* i18n keys across all six locales. CyclePrediction
caches one forecast per user, regenerated debounced.
Migrations 0128-0130 are additive; the testcontainer integration suite
applies the full history from scratch and passes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
