Todo description, entity codes, REST API extensions and Claude Code hardening (ST-509/511/512/513) (#2)

* docs(ST-511): add backlog entry for entity codes feature

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ST-511): add createWithCodeRetry helper to handle P2002 race on auto codes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ST-511): retry on auto-code unique conflict in story and pbi create

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ST-511): surface field errors for code and title in PBI dialog

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ST-511): read create-state errors in Story dialog fieldError

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(ST-512): add backlog entry for REST API code/description/implementation_plan extensions; mark ST-511 done

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-512): extend REST API with code, description and implementation_plan

- GET /api/products returns code, description and definition_of_done
- GET /api/products/:id/next-story returns story.code and per-task code + implementation_plan
- GET /api/sprints/:id/tasks returns description, implementation_plan, story_code and derived per-task code
- POST /api/todos accepts and returns optional description (max 2000)

All changes are additive — existing clients ignore unknown keys.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(ST-512): mark ST-512 as done

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(ST-513): add backlog entry for API hardening for Claude Code

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): add task and story status mappers for API boundary

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): expose lowercase status on API and accept lowercase in PATCH /api/tasks

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): add metadata JSONB column to StoryLog

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): accept optional metadata in story log and switch validation errors to 422

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): add GET /api/health endpoint with optional db ping

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(ST-513): add GET /api/products/:id/claude-context bundled endpoint

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(ST-513): add docs/API.md and link from CLAUDE.md specs table

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(ST-513): mark ST-513 as done

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ST-513): split 400 (malformed JSON) from 422 (validation), reject 'review'

Codex review on PR #2:

- P2.1: routes treated JSON parse failures as 422 instead of 400, breaking
  the contract in docs/API.md. Replace `request.json().catch(() => null)`
  with try/catch in 4 routes (tasks, reorder, todos, story-log) so a
  malformed body returns 400 and only well-formed-but-invalid bodies
  return 422.

- P2.2: PATCH /api/tasks/:id accepted `status: "review"`, but the sprint
  task list UI does not render REVIEW (no label/color, the cycle helper
  falls back to TO_DO). Reject `review` at the API until the sprint UI
  is extended; document the subset in docs/API.md.

Tests in __tests__/api updated for the new contract (29 assertions:
zod-failures now expect 422, status payloads use lowercase API values,
sprint-tasks mocks include the new story relation).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/code-server.ts

@@ -1,5 +1,43 @@
+import { Prisma } from '@prisma/client'
 import { prisma } from '@/lib/prisma'
 
+const MAX_AUTO_CODE_ATTEMPTS = 3
+
+function isCodeUniqueConflict(error: unknown): boolean {
+  if (!(error instanceof Prisma.PrismaClientKnownRequestError)) return false
+  if (error.code !== 'P2002') return false
+  const target = (error.meta as { target?: string[] | string } | undefined)?.target
+  if (!target) return false
+  if (Array.isArray(target)) return target.includes('code')
+  return target.includes('code')
+}
+
+/**
+ * Generate an auto code, then run the create. If the insert collides with an
+ * existing code (P2002 on the code column), regenerate and retry up to a small
+ * number of attempts. Protects against the SELECT-MAX → INSERT race when two
+ * concurrent requests pick the same next number.
+ */
+export async function createWithCodeRetry<T>(
+  generate: () => Promise<string>,
+  create: (code: string) => Promise<T>,
+): Promise<T> {
+  let lastError: unknown
+  for (let attempt = 0; attempt < MAX_AUTO_CODE_ATTEMPTS; attempt++) {
+    const code = await generate()
+    try {
+      return await create(code)
+    } catch (e) {
+      if (isCodeUniqueConflict(e)) {
+        lastError = e
+        continue
+      }
+      throw e
+    }
+  }
+  throw lastError ?? new Error('Kon geen unieke code genereren')
+}
+
 const STORY_AUTO_RE = /^ST-(\d+)$/
 const PBI_AUTO_RE = /^PBI-(\d+)$/