---
phase: 24-aws-route-53-dns-sync-track-changes-crud-operations-full-aud
plan: 03
subsystem: route53-crud-write-persistence
tags: [route53, dns, crud, audit, validation, security]
dependency-graph:
  requires: ["24-01"]
  provides:
    - "lib/services/route53-record-validation.ts (WRITABLE_RECORD_TYPES, validateRecordWrite, sanitizeAwsError)"
    - "lib/services/route53-write-persistence.ts (createPendingAuditLog, markAuditCommitted, markAuditFailed, insertPulseCrudHistory, upsertMirrorRecord, softDeleteMirrorRecord, loadMirrorRecord)"
  affects:
    - "plan 24-05 (CRUD routes will import both modules directly)"
tech-stack:
  added: []
  patterns:
    - "pending -> committed/failed audit lifecycle (mirrors lib/services/analyzer/asset-audit/persistence.ts)"
    - "closed allowlist validation (mirrors app/api/analyzer/itglue/.../apply/route.ts credential-field blocklist pattern, inverted to an allowlist)"
key-files:
  created:
    - lib/services/route53-record-validation.ts
    - lib/services/route53-record-validation.test.ts
    - lib/services/route53-write-persistence.ts
    - lib/services/route53-write-persistence.test.ts
  modified:
    - .planning/phases/24-aws-route-53-dns-sync-track-changes-crud-operations-full-aud/deferred-items.md
decisions:
  - "ValidateRecordWriteInput fields are optional (name?, type?) rather than required, since the whole point of the validator is to accept untrusted/arbitrary request-body shapes at runtime — TypeScript's structural typing otherwise blocked constructing test payloads that omit a field to prove the runtime check fires"
metrics:
  duration_minutes: 25
  tasks_completed: 2
  files_created: 4
  files_modified: 1
  test_assertions_added: 32
  completed: 2026-08-06
---

# Phase 24 Plan 03: Record Validation and Write-Persistence Summary

Server-side D-01 record-type allowlist validator + AWS error sanitizer, and the pending
-> committed/failed audit lifecycle with pulse_crud history persistence that the plan
24-05 CRUD routes will depend on.

## What Was Built

**`lib/services/route53-record-validation.ts`**
- `WRITABLE_RECORD_TYPES`: frozen array of exactly `['A', 'AAAA', 'CNAME', 'MX', 'TXT', 'SRV']` —
  a closed allowlist. `NS`/`SOA` appear nowhere in this array; they only appear inside the
  rejection branch's `ZONE_DELEGATION_TYPES` set and its explicit reason message.
- `validateRecordWrite(input)`: validates `name` (trim/lowercase/trailing-dot normalization),
  `type` (case-insensitive uppercase match against the allowlist, explicit delegation-aware
  rejection reason for NS/SOA, generic rejection for any other unlisted type such as CAA/DS),
  `ttl` (integer 0..2147483647, default 300), and `resourceRecords` (non-empty array, each
  entry a non-empty string value, capped at 100 entries — T-24-12 DoS guard). No AWS SDK or
  Postgres import — confirmed by `grep -c "@aws-sdk\|postgres-client"` returning 0.
- `sanitizeAwsError(err)`: redacts `AKIA`-prefixed access key ids, `arn:aws:*` substrings, and
  12-digit AWS account ids, then truncates to 500 characters. Never throws, even on
  non-Error input.
- 23 test assertions cover every `<behavior>` bullet including case-insensitivity (`NS`/`ns`),
  the closed-allowlist rejection of an unlisted type (`CAA`, `DS`), TTL boundary values, and
  the sanitizer stripping both an example AWS key id and ARN from a single error message.

**`lib/services/route53-write-persistence.ts`**
- `createPendingAuditLog` / `markAuditCommitted` / `markAuditFailed`: the three-function
  pending -> committed/failed shape mirrored from
  `lib/services/analyzer/asset-audit/persistence.ts`. `createPendingAuditLog` must be awaited
  before any AWS `ChangeResourceRecordSetsCommand` is constructed by the (future) CRUD routes.
  `markAuditFailed` always routes the error through `sanitizeAwsError` — never a raw error
  object or `JSON.stringify(err)`.
- `insertPulseCrudHistory`: writes a `source='pulse_crud'` row to `route53_record_history`.
  Documented directly above the function that it must only be called after
  `markAuditCommitted` — a failed AWS attempt gets an audit row but no history row.
- `upsertMirrorRecord` / `softDeleteMirrorRecord`: best-effort refresh/soft-delete of the
  `route53_records` mirror after a committed write. Wrapped in try/catch, logged with a
  `[ROUTE53-WRITE]` prefix via `sanitizeAwsError`, never thrown — the AWS write already
  succeeded and the next incremental sync reconciles regardless. Confirmed
  `grep -c 'DELETE FROM route53_records'` returns 0 — soft-delete only (D-08).
- `loadMirrorRecord`: manual snake_case -> camelCase transform (no ORM, per CLAUDE.md) of the
  current mirror row, supplying `before_value` and the exact TTL/value set a Route 53 DELETE
  needs to match.
- 9 test assertions against a mocked `postgresClient` (same `vi.mock` style as
  `pax8-sync-service.test.ts`) verify: the pending INSERT contains `'pending'`, the committed/
  failed UPDATEs contain their respective status literals, `markAuditFailed`'s bound
  parameters never contain a raw AWS key id, `insertPulseCrudHistory` binds the literal
  `'pulse_crud'`, `softDeleteMirrorRecord` never issues `DELETE FROM`, both mirror helpers
  resolve (never throw) even when the underlying query rejects, and `loadMirrorRecord`
  correctly transforms a found row / returns `null` when absent.

## Verification

- `npx vitest run lib/services/route53-record-validation.test.ts lib/services/route53-write-persistence.test.ts` — 32/32 passed
- `npx tsc --noEmit --pretty` — exits 0
- `npm test` (full suite) — 499/501 passed; 2 pre-existing failures in
  `lib/services/analyzer/itglue-search.test.ts`, unrelated to this plan (see Deferred Issues)
- `grep -c "'NS'\|'SOA'" lib/services/route53-record-validation.ts` — 1 (only inside the
  rejection Set/reason, never inside `WRITABLE_RECORD_TYPES`)
- `grep -c "@aws-sdk\|postgres-client" lib/services/route53-record-validation.ts` — 0
- `grep -c 'DELETE FROM route53_records' lib/services/route53-write-persistence.ts` — 0
- `grep -q 'sanitizeAwsError' lib/services/route53-write-persistence.ts` — found
- `grep -c "'pulse_crud'" lib/services/route53-write-persistence.ts` — 2

## Deviations from Plan

None — plan executed exactly as written, aside from one non-substantive typing adjustment:

**1. [Rule 3 - blocking issue] `ValidateRecordWriteInput` fields made optional**
- **Found during:** Task 1, `npx tsc --noEmit --pretty`
- **Issue:** The plan's signature `validateRecordWrite(input: { name: unknown; type: unknown; ... })`
  requires the `name`/`type` properties to be present (even though typed `unknown`).
  A behavior test intentionally omits `name` to prove the runtime "missing name" rejection
  fires — TypeScript's structural typing blocked constructing that test payload.
- **Fix:** Made `name?: unknown` and `type?: unknown` optional in the internal
  `ValidateRecordWriteInput` interface. Runtime behavior is unchanged (the function still
  checks `typeof input.name !== 'string'`, which already covers `undefined`).
- **Files modified:** `lib/services/route53-record-validation.ts`
- **Commit:** 4be4a19

## Deferred Issues

None specific to this plan's own code. Two pre-existing, unrelated `npm test` failures in
`lib/services/analyzer/itglue-search.test.ts` were re-observed during full-suite verification
and logged (not fixed, out of scope) in `deferred-items.md` under both the original Plan 24-01
entry and a new Plan 24-03 entry.

## Self-Check: PASSED

- FOUND: lib/services/route53-record-validation.ts
- FOUND: lib/services/route53-record-validation.test.ts
- FOUND: lib/services/route53-write-persistence.ts
- FOUND: lib/services/route53-write-persistence.test.ts
- FOUND commit: 4be4a19
- FOUND commit: 8b5e926
