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The Apple Health ZIP import upserted each spot reading on the (userId, type, source, externalId) index only. When two readings shared the natural key (userId, type, measuredAt, source, sleepStage) with different externalIds — a re-import of overlapping data, or two same-instant Apple samples from different source apps — the externalId upsert missed and the create collided on the second unique index (migration 0055), raising P2002 and aborting the entire import (issue #486, after the v1.28.36 dedup fix let the upload run). flushSpotBatch now wraps the per-row upsert: on P2002 it probes the occupying row by the natural key (tombstone-inclusive) and adopts it in place — re-keys to the incoming externalId, takes the new value/unit, resurrects if soft-deleted — mirroring the v1.28.39 provider natural-key rescues (closest to withings/sync-sleep). If no twin resolves it, the one reading is skipped and the run continues; the catch sits in the per-row loop outside any transaction, so a collision can never abort the batch or the import. Adopted rows count as updated, skipped ones surface honestly. Workout + stats: paths verified unable to hit this (no second unique index / deterministic externalId). Repro + real-Postgres integration tests added.
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. Also home to the MCP-server contract:api/mcp-capabilities.md(tools, resources, prompts, write model) andapi/mcp-skills.md(building a connector / skill).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. Includesself-hosting/mcp.md— enabling the off-by-default MCP connector and pointing Claude.ai / ChatGPT / Claude Desktop at it, andself-hosting/sso.md— OIDC SSO login: IdP setup, the identity-pinning security model,OIDC_ONLYconsequences, and the break-glass runbook.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.