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Marc-André Bombeck b2ee7f11d1 True up the integration references

- ai-providers: /api/ai/test returns provider type, model, token usage
  and a sample with a reasonCode on failure; drop drifted line numbers
- apple-health: source-priority overrides moved to /settings/sources;
  cite the constant instead of line numbers
- data-import: four import paths (medication dose history added); ECG
  and metric-typed clinical records are imported; measurement
  externalId documented; CSV re-uploads dedupe on the natural key;
  mood loggedAt defaults to the start of the given date; the type
  table is a curated subset with /api/meta/capabilities authoritative
- fitbit: the source-priority ladder ships, FITBIT is ranked in every
  default ladder
- google-health: Sources is its own settings section, not nested under
  Integrations
- withings: disconnect unsubscribes the webhook and deletes stored
  tokens without revoking the Withings-side grant; the connection test
  is self-serve, not admin-only; the safety-net cron is hourly;
  refresh stale references

2026-08-27 12:26:08 +02:00

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Fitbit integration (Fitbit & Pixel)

Experimental. Field mapping is still being verified against live accounts, so some values may be missing or change in a future update.

HealthLog reads Fitbit and Pixel Watch data through the classic Fitbit Web API (api.fitbit.com). The OAuth app is a Fitbit developer app registered at dev.fitbit.com — not a Google Cloud OAuth client. Like WHOOP, credentials are brought per user: each user (or the operator on their behalf) supplies their own Fitbit app's client id/secret in Settings. The internal integration key is fitbit.

Common mistake: the field wants a Fitbit Client ID (a short numeric id from dev.fitbit.com), not a Google Cloud client id ending in .apps.googleusercontent.com. A Google Cloud client fails at the Fitbit consent screen with unauthorized_client — Invalid client_id, because Fitbit and Google Cloud are separate client registries.

Heads-up — new registrations are closed. Fitbit has discontinued self-serve app registration: the form at dev.fitbit.com/apps/new is disabled for new applications, and the classic Fitbit Web API sunsets in September 2026. If you already hold a registered Fitbit app, it keeps working until the sunset and the setup below still applies. If you are connecting Fitbit data for the first time, use the Google Health integration instead — Fitbit devices sync into Google's health stack, which HealthLog reads directly.

1. Use an existing Fitbit developer app

Registration of new apps is no longer possible (see the note above). For an app you registered before the shutdown, these are the settings that matter:

OAuth 2.0 Application Type:
- Personal — the app only ever sees the owner's own Fitbit account, and gets intraday (per-minute) heart-rate/steps automatically. This is the right choice for a single-person self-host.
- Server (or Client) — needed when the instance connects other people's accounts. Intraday/heart-rate access is then granted case by case via Fitbit's Intraday Data Access request form.
Callback URL: https://your-instance.example.com/api/fitbit/callback — absolute, HTTPS, and matching the redirect_uri HealthLog sends (see the redirect-URI note below). One entry per environment you connect from.
Scopes: the ones HealthLog requests (next section).
The app's settings page shows the Client ID (short, numeric) and the Client Secret — keep the secret out of any chat log.

2. Scopes

HealthLog requests exactly these read scopes (space-separated on the wire):

activity cardio_fitness heartrate oxygen_saturation profile respiratory_rate sleep weight

The temperature scope is intentionally omitted — the classic skin-temperature reading is a baseline delta rather than an absolute value, so it has no honest canonical slot yet. The authorization uses the Authorization Code Grant with PKCE (S256), which Fitbit recommends; HealthLog mints the code_verifier server-side and never exposes it to the browser.

3. Wire the credentials in Settings → Integrations

Credentials are stored per user, not in .env. Sign in as the target user, open Settings → Integrations → Fitbit, and paste the Client ID and Client Secret. They are encrypted AES-256-GCM at rest.

4. Connect

Click Connect with Fitbit. HealthLog redirects to the Fitbit consent screen (www.fitbit.com/oauth2/authorize), exchanges the returned code for an access + refresh token at api.fitbit.com/oauth2/token, stores them encrypted, and runs an initial sync. There is no webhook — Fitbit syncs on the safety-net cron pull. Classic Fitbit refresh tokens rotate (one-time use); HealthLog replaces the stored token on every refresh.

Redirect URI is validated strictly

The resolved redirect_uri is asserted at connect time to be absolute, https (or http on localhost), to target exactly /api/fitbit/callback, and — when FITBIT_REDIRECT_URI is set alongside NEXT_PUBLIC_APP_URL — to share its origin. A misconfigured value fails closed rather than redirecting elsewhere.

Optional instance env var

# Only when the callback origin differs from NEXT_PUBLIC_APP_URL:
FITBIT_REDIRECT_URI="https://your-instance.example.com/api/fitbit/callback"

The Fitbit client id/secret are per-user (Settings), not env vars.

Source overlap

If Fitbit and another source (Withings, WHOOP, Apple Health) both supply the same vital — resting heart rate, blood oxygen, body temperature or respiratory rate — the source priority ladder in Settings → Sources decides which one wins per metric. FITBIT is ranked in every default metric ladder; override per metric on that page.

Disconnect

The Settings Disconnect button revokes the stored tokens and removes the connection. Previously synced measurements stay in the database.

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