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Marc-André Bombeck
b55850967d
The replay cell was keyed on (user, key, method, path). A client that sends two different writes under one key got the first write's cached response for the second, and the second was never saved. Native clients up to 1.1.0 post the two halves of a manual blood pressure exactly that way, so the diastolic value was silently dropped. Each cell now stores a SHA-256 fingerprint of the request body (JSON with recursively sorted keys, otherwise the raw bytes; scoped by method and path; at most the first MiB is read). Lookup replays, or refuses as in flight, only when the fingerprint matches. A different body, or a row written before the column existed, runs the handler without claiming or caching and leaves the existing cell for its own retries; a lost claim race re-checks the winner's fingerprint the same way. The body itself is never stored. Migration 0371 adds the nullable idempotency_keys.request_fingerprint column. The OpenAPI parameter description, the client notes and the Home Assistant guide say what a replay now requires. docs/ops gains a read-only query that lists systolic readings left without their diastolic half, held to the schema by an integration test.
prisma/
The database layer. HealthLog runs PostgreSQL 16 via Prisma 7. This directory holds the single schema file and the forward-only migration history; the generated client is emitted elsewhere.
Contents
schema.prisma— 61 models, one file.cuid()primary keys,snake_casecolumns via@map(...), encrypted columns mostly suffixed*Encrypted(search the file; there are 24 encrypted column references). Thegenerator clientblock emits to../src/generated/prisma(imported as@/generated/prisma).migrations/— numbered, forward-only SQL migrations (0001_…upward).migration_lock.tomlpins the provider topostgresql.
Migration workflow
# author a migration from a schema edit
pnpm dlx prisma migrate dev --name <short_snake_case_name>
# regenerate the client after any schema change
pnpm dlx prisma generate
Number a new migration with the next free prefix. The production entrypoint runs prisma migrate deploy on boot, so every migration must apply cleanly forward — there is no down-migration path. Always include the migration file in the same change as the schema edit.
Conventions
- Encryption is fail-closed:
*Encryptedcolumns are written through@/lib/crypto(AES-256-GCM, versioned key ids); never store plaintext in an encrypted column. Key rotation isscripts/rotate-encryption-key.ts+docs/ops/encryption-key-rotation.md. - The generated client under
src/generated/prismais build output — do not edit it. - Schema-touching changes that affect the API surface must regenerate
docs/api/openapi.yaml(see../CLAUDE.md).
Related: ../src/lib/README.md (db.ts, rollups/), ../docs/ops/ (migrations + backup runbooks).