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Marc-André Bombeck
f5d259db58
Windowed slope, r2 and population sd still ran a live REGR_*/STDDEV_POP query over the raw measurements partition on every warm-rollup request, because the per-bucket mean cannot reconstruct an OLS regression over the raw points in a window. The per-bucket sd/slope/r2 columns are a within-bucket fold and do not compose linearly across DAY buckets. Add the four regression-accumulator sums Postgres folds for REGR_* / STDDEV_POP - sum_x, sum_xy, sum_xx, sum_yy - per (user, type, granularity, bucketStart, source) over the same canonical-source rows the live query reads, with the x-axis in epoch days. With n = count and sum_y = mean*count already stored, all six terms are additive across buckets, so a 7/30/90-day slope/r2/sd composes from the summed accumulators with a bit-identical result to the live closed form. Migration 0190 adds the four nullable columns; nullable keeps it additive so existing rows read NULL until the boot re-fold refills them (mirrors the v1.4.39 sum_value rollout). The populator emits the four SUM terms inside the existing aggregate (no extra round-trip) and persistRollupRows writes them. composeRegression / composeWindowedRegression evaluate the closed form from already-collapsed buckets and return a full miss when any in-window bucket lacks accumulators, so the reader falls back to live SQL rather than composing a partial window.
src/lib/
The server and runtime toolkit. Everything that is not a page, component, or route handler lives here: the API kit, auth, crypto, the rollup tier, AI providers, notifications, background jobs, and the integration clients. Route handlers and RSC pages compose these modules; the modules never reach back into app/.
Core request kit
api-handler.ts— theapiHandlerwrapper every route uses. Auth resolver (cookie OR Bearer),requireAuth/requireAdmin(admin is cookie-only by construction), idempotency plumbing, Wide-Event builder, GlitchTip forwarder.api-response.ts— the{ data, error, meta? }envelope:apiSuccess/apiError,safeJson, trusted-proxy IP resolver,returnAllZodIssues+sanitiseZodIssues.rate-limit.ts— Postgres-backed sliding-window limiter (single atomic upsert); multi-instance correct.idempotency.ts— user-scoped idempotency keys that refuse to cache secret-shaped responses.query-keys/— the only legal source of TanStack QueryqueryKey/mutationKeyarrays (enforced by an ESLint rule); per-feature files behind theindex.tsbarrel.safe-fetch.ts— the one documented outbound-egress entry (redirect: "manual"+ timeout; optional connect-time DNS-rebinding pin). Rawfetch(underlib/+app/is banned by ESLint.db.ts— the Prisma client singleton.crypto.ts— AES-256-GCM at rest with versioned key ids, fail-closed loader, rotation primitives.
Subsystems
auth/— Postgres sessions, secure-cookie flag policy, passkey (WebAuthn) + Argon2id password, per-device refresh-token rotation, HMAC Bearer tokens.ai/— multi-provider insight + Coach engine:provider-chain.ts, hand-rolled{openai,anthropic,local,codex,mock}-client.ts,coach/,prompts/, citation + confidence helpers.rollups/— DAY/WEEK/MONTH/YEAR pre-aggregations for measurements, mood, and medication compliance. Read-swap pattern: probe the rollup, fall back to live SQL on a coverage miss.notifications/— the dispatcher cascade (APNs → Telegram → ntfy → Web Push), per-channelsenders/, retry policy, VAPID config.jobs/— pg-boss workers: reminders, insight pre-generation, backups, retention sweeps, integration backfills. Recurring work belongs here, not inscripts/.integrations/,withings/,whoop/,fitbit/— OAuth clients and sync services for the device providers;sync/holds the shared delta-feed plumbing.analytics/— trend calculations, cadence-aware medicationcompliance.ts, correlations.insights/,fhir/,doctor-report-*.ts— insight pipeline, FHIR R4 export, client-side doctor-report PDF.openapi/— Zod registry that is the source of truth fordocs/api/openapi.yaml.logging/,observability/,monitoring/— Wide-Event transports and the central redaction denylists (redact at the egress boundary, not the call site).validations/— shared Zod schemas, including the SSRFisPublicUrlfloor.i18n/,tz/+timezone.ts,format*.ts— translations, timezone helpers (Berlin for display, UTC in DB), locale formatting.
Conventions
Kebab-case filenames. See ../../CLAUDE.md "Code conventions" and "Security-relevant patterns"; the critical-files map there cites the exact entry points. Most modules carry tests in a sibling __tests__/.