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Build the composite tier of the derived-metrics layer on the shared seam: - Sleep score — a transparent 0–100 composite from sufficiency, efficiency, consistency, timing and composition sub-scores over the per-stage sleep rows, reweighting around any sub-score the data cannot support (a legacy asleep-only night drops composition gracefully rather than fabricating it). - Wellness/readiness index — extends the health-score null-redistribution blend with resting-HR, HRV (SDNN), sleep, respiratory-rate and mood deviation-from-baseline components; returns insufficient below two present components so it never headlines from one signal. - Coincident-deviation flag — counts vitals outside their personal band on the latest day and fires when two or more coincide, listing the contributing vitals as possible factors, never a cause or a diagnosis. Each composite cites its standard, carries coverage + confidence + provenance, and reweights around missing inputs. Add an FDR-controlled correlation discovery engine behind GET /api/insights/correlations: it scans a curated behaviour x outcome matrix, lag-joins each behaviour day to the next day's outcome, runs Pearson with the exact Student-t p-value, and applies Benjamini-Hochberg control across every tested pair so only statistically-defensible patterns surface — each tagged with n, r, p and the adjusted q, framed descriptive not causal. Add the score-anatomy detail view at /insights/scores/<metric>: a full score ring, ranked contributor rows each showing its push/pull and weight share, and the cited-standard provenance explainer — reused by every composite, mobile-first and accessible. Regenerate the OpenAPI contract for the new metric values + the correlation discovery response, and add the i18n keys across all six locales.
docs/ — internal reference + operator playbooks
The user-facing documentation lives at https://docs.healthlog.dev — that's the canonical surface for self-hosting guides, integration walkthroughs, AI-provider setup, and the doctor-report workflow.
The files in this directory are the internal operator playbooks, audit notes, and machine-readable specs that ship alongside the source:
api/— the OpenAPI 3.1 spec for the native-client subset (iOS DTO codegen target). Seeapi/README.mdfor the preview commands.ops/— backup / restore + encryption-key-rotation playbooks. These are the runbooks an operator reaches for during an incident.self-hosting/— horizontal-scaling notes (HEALTHLOG_PROCESS_TYPE=web|worker|all) and the deploy-pipeline recipe. Routine install steps stay ondocs.healthlog.dev.migration/— release-by-release migration notes. Read the entry for the version you're upgrading from.audit/— per-release audit summaries archived for forensic traceability.apple-store-connect-checklist.md— the iOS submission gate.doctor-report.md— PDF generator design notes.codex-protocol-spec.md— Codex / ChatGPT OAuth protocol reverse-engineering notes.ui-guidelines.md— UI / a11y house style.
If you're a self-hoster looking to spin up an instance, start at https://docs.healthlog.dev or jump to the Quick Start in the project README.