The shipped Fitbit integration spoke the Google Health API, whose Restricted
scopes need brand verification plus an annual CASA assessment before leaving
testing mode — a wall most self-hosters cannot clear. Retarget the transport to
the classic api.fitbit.com Web API: a self-hoster registers an app at
dev.fitbit.com in minutes, no CASA.
Forks only the transport; the upsert/dedup/rollup tail, source-priority,
backfill, poll worker, and status ledger are reused unchanged.
- OAuth: www.fitbit.com/oauth2/authorize + api.fitbit.com/oauth2/token, PKCE
(S256), classic self-serve scopes.
- Refresh tokens rotate (one-time use): persist the new token every refresh,
with a defensive keep-existing guard on a malformed reply.
- Per-endpoint date-range fetchers chunked to the API range caps; the backfill
horizon and poll concurrency are tuned for the 150 req/h-per-user budget.
- Verified classic-shape extractors for weight, body fat, SpO2, HRV (dailyRmssd),
resting HR, respiratory rate, steps, distance, active calories, floors, VO2 max
(range midpoint), per-segment sleep stages, and workouts.
- Skips intraday HR (needs a per-app grant; daily resting HR covers it) and skin
temperature (a baseline delta with no honest absolute slot).
One-shot prettier pass so the new format:check gate starts from a clean
baseline. Formatting only — no behaviour change. Generator-owned and
vendored artifacts stay untouched via .prettierignore.
Snapshot the incremental watermark once per sync cycle and thread the same
lower bound to every resource (metrics, activity, sleep, workout), stamping
lastSyncedAt once at the end. Previously each resource read lastSyncedAt then
stamped now() independently, so the first resource advanced the watermark and
later resources only fetched the last overlap window — silently dropping the
gap after an outage longer than the overlap. The full/backfill path is
unaffected (it passes no lower bound).
Reject an OAuth callback whose token response carries no refresh_token instead
of persisting an empty string. An empty refresh token bricks every future
token refresh; the callback now errors out cleanly so the user re-consents
rather than landing a dead connection.
Model the INTERVAL data types (steps/distance/calories/floors daily totals,
sleep and exercise sessions) on Google Health's interval.start_time /
interval.civil_start_time anchor instead of a sample_time / bare date. The
incremental filter for sleep/exercise previously targeted
sample_time.physical_time, which 400s/empties for interval types and stalls
incremental sync. Daily-summary metrics and spot readings keep their existing
date / sample anchors. Shape mismatches still fail safe (return []/null).
Mark the Google Health (Fitbit & Pixel) settings card as experimental with a
badge and a short note that data coverage is still being verified, in all six
locales.
(cherry picked from commit 3f116802149eebe9144729e2779f7f4405f248f2)
Extend the Fitbit / Google Health provider with the remaining sync
resources, driven by the existing syncUserFitbit orchestrator.
Activity (daily cumulative): steps -> ACTIVITY_STEPS, distance ->
WALKING_RUNNING_DISTANCE, the active-energy portion -> ACTIVE_ENERGY_BURNED,
floors -> FLIGHTS_CLIMBED, and VO2 max -> VO2_MAX. Each daily total mints a
stats:<tag>:<YYYY-MM-DD> externalId so a re-fetched day overwrites in place
rather than duplicating, matching the Apple-Health daily-total contract. The
running totals preserve a legitimate zero (a rest day is real data); VO2 max
stays strictly positive (daily latest-wins).
Sleep: map a session's per-stage segments to per-stage SLEEP_DURATION rows
(minutes; measuredAt = the stage end), harmonised onto the shared SleepStage
enum (light -> CORE, deep -> DEEP, rem -> REM, awake/restless -> AWAKE,
in-bed -> IN_BED, classic asleep -> ASLEEP) so the night-total and hypnogram
readers consume the same shape they already read for WHOOP and Apple.
Workouts: map exercise sessions to Workout rows keyed (userId, FITBIT,
externalId), with sport-type, start/end, duration, energy, distance, and HR.
Cross-source twins stay distinct at ingest; the read-time canonical picker
collapses them via the source ladder (Fitbit already ranked below WHOOP).
All three join the orchestrator's resource list and ride the per-resource
403 soft-skip so an independently-granted Restricted bundle that the user
withheld skips only its own resource. Rollups recompute and status-insight
caches invalidate through the shared upsert. No new MeasurementType, no
migration, no new dependency.
Extend the Fitbit/Google Health provider with the read path: the
dataPoints.list client half, the metrics-bundle sync, the poll + backfill
jobs, and the connection-management routes. Builds on the existing OAuth +
credentials + token-refresh layer.
- client: paginated `fetchDataPoints` walker over `safeFetch` keyed on
`nextPageToken`, encoding each data type kebab-case in the path and
snake_case in the filter predicate; defensive per-type mappers (finite +
positive guards) for weight, body fat, daily SpO2, daily HRV, daily resting
heart rate, daily respiratory rate, intraday heart rate, sleep-temperature
derivations, and a height profile-seed extractor. `FITBIT_FIELD_MAP` +
`mapping.md` are the source of truth.
- mapping (no new MeasurementType): weight→WEIGHT, body-fat→BODY_FAT,
SpO2→OXYGEN_SATURATION, HRV→HEART_RATE_VARIABILITY (SDNN slot, not
HRV_RMSSD), resting-HR→RESTING_HEART_RATE, respiratory-rate→RESPIRATORY_RATE,
heart-rate→PULSE, sleep-temp→WRIST_TEMPERATURE, height→User.heightCm when
null. Steps/distance/energy/floors/VO2 + sleep + workouts stay for a later
wave.
- sync: `syncUserFitbit` orchestrator with the reauth short-circuit, the
per-data-class 403 soft-skip (the six Restricted bundles grant
independently), the all-soft-skipped success guard, and incremental-vs-full
windows; `upsertFitbitMeasurements` keyed (userId,type,FITBIT,externalId)
with a 24 h overlap for after-the-fact daily re-rolls, recomputing rollups
and invalidating status caches. Google refresh tokens do not rotate, so the
stored refresh token is kept unless a new one is returned.
- jobs: hourly `fitbit-sync` poll (poll-only; Pub/Sub deferred), the
self-converging boot backfill, and the daily OAuth-state sweep — every queue
registered in both `allQueues` and a `boss.work` binding, staggered off the
WHOOP/Withings crons.
- routes: status / sync / disconnect mirroring the WHOOP shape.
Tests cover the mappers, the casing invariant, `fetchDataPoints`, the
orchestrator soft-skip guard, the idempotent upsert, the backfill discovery,
and the queue registration; an integration test pins the upsert idempotency,
the DAY rollup fold, and the Fitbit-vs-Withings per-source no-collapse against
the Postgres testcontainer.
Marc-André Bombeck