diff --git a/__tests__/update-job-status-timestamps.test.ts b/__tests__/update-job-status-timestamps.test.ts
deleted file mode 100644
index d4ab80f..0000000
--- a/__tests__/update-job-status-timestamps.test.ts
+++ /dev/null
@@ -1,74 +0,0 @@
-// Unit-tests voor resolveJobTimestamps — de status-gedreven timestamp-helper
-// van update_job_status. Pure functie, geen mocks (zoals update-job-status-gate).
-
-import { describe, it, expect } from 'vitest'
-import { resolveJobTimestamps } from '../src/tools/update-job-status.js'
-
-const NOW = new Date('2026-05-14T12:00:00.000Z')
-const EARLIER = new Date('2026-05-14T11:00:00.000Z')
-
-describe('resolveJobTimestamps', () => {
-  describe('running', () => {
-    it('sets started_at when not yet set, no finished_at', () => {
-      const r = resolveJobTimestamps('running', { claimed_at: EARLIER, started_at: null }, NOW)
-      expect(r.started_at).toBe(NOW)
-      expect(r.finished_at).toBeUndefined()
-      expect(r.claimed_at).toBeUndefined()
-    })
-
-    it('is set-once: does not re-stamp started_at when already set', () => {
-      const r = resolveJobTimestamps('running', { claimed_at: EARLIER, started_at: EARLIER }, NOW)
-      expect(r.started_at).toBeUndefined()
-      expect(r.finished_at).toBeUndefined()
-      expect(r.claimed_at).toBeUndefined()
-    })
-  })
-
-  describe('terminal transitions (done/failed/skipped)', () => {
-    it.each(['done', 'failed', 'skipped'] as const)(
-      'backfills started_at and sets finished_at for %s when started_at is null',
-      (status) => {
-        const r = resolveJobTimestamps(status, { claimed_at: EARLIER, started_at: null }, NOW)
-        expect(r.started_at).toBe(NOW)
-        expect(r.finished_at).toBe(NOW)
-        expect(r.claimed_at).toBeUndefined()
-      },
-    )
-
-    it('only sets finished_at when started_at is already set', () => {
-      const r = resolveJobTimestamps('done', { claimed_at: EARLIER, started_at: EARLIER }, NOW)
-      expect(r.started_at).toBeUndefined()
-      expect(r.finished_at).toBe(NOW)
-      expect(r.claimed_at).toBeUndefined()
-    })
-  })
-
-  describe('claimed_at backfill', () => {
-    it.each(['running', 'done', 'failed', 'skipped'] as const)(
-      'backfills claimed_at for %s when it is null',
-      (status) => {
-        const r = resolveJobTimestamps(status, { claimed_at: null, started_at: null }, NOW)
-        expect(r.claimed_at).toBe(NOW)
-      },
-    )
-
-    it('never returns claimed_at when it is already set', () => {
-      const r = resolveJobTimestamps('done', { claimed_at: EARLIER, started_at: EARLIER }, NOW)
-      expect(r.claimed_at).toBeUndefined()
-    })
-  })
-
-  it('returns only finished_at when all timestamps are already set and status is terminal', () => {
-    const r = resolveJobTimestamps('failed', { claimed_at: EARLIER, started_at: EARLIER }, NOW)
-    expect(r).toEqual({ finished_at: NOW })
-  })
-
-  it('defaults now to a fresh Date when omitted', () => {
-    const before = Date.now()
-    const r = resolveJobTimestamps('running', { claimed_at: EARLIER, started_at: null })
-    const after = Date.now()
-    expect(r.started_at).toBeInstanceOf(Date)
-    expect(r.started_at!.getTime()).toBeGreaterThanOrEqual(before)
-    expect(r.started_at!.getTime()).toBeLessThanOrEqual(after)
-  })
-})
diff --git a/src/tools/update-job-status.ts b/src/tools/update-job-status.ts
index 9fcd08b..e7a9495 100644
--- a/src/tools/update-job-status.ts
+++ b/src/tools/update-job-status.ts
@@ -390,32 +390,6 @@ export function resolveNextAction(
   return queueCount > 0 ? 'wait_for_job_again' : 'queue_empty'
 }
 
-export type JobTimestampUpdate = {
-  claimed_at?: Date
-  started_at?: Date
-  finished_at?: Date
-}
-
-// Bepaalt welke lifecycle-timestamps update_job_status schrijft bij een
-// status-overgang. Set-once (backfill alleen als nu null) houdt de invariant
-// claimed_at ≤ started_at ≤ finished_at: een job die CLAIMED → done gaat
-// zonder `running`-rapport krijgt alsnog een started_at, en claimed_at
-// (normaal door wait_for_job bij claim gezet) wordt nooit overschreven.
-export function resolveJobTimestamps(
-  status: 'running' | 'done' | 'failed' | 'skipped',
-  current: { claimed_at: Date | null; started_at: Date | null },
-  now: Date = new Date(),
-): JobTimestampUpdate {
-  const isTerminal = status === 'done' || status === 'failed' || status === 'skipped'
-  const update: JobTimestampUpdate = {}
-  if (current.claimed_at == null) update.claimed_at = now
-  if (current.started_at == null && (status === 'running' || isTerminal)) {
-    update.started_at = now
-  }
-  if (isTerminal) update.finished_at = now
-  return update
-}
-
 export async function maybeCreateAutoPr(opts: {
   jobId: string
   productId: string
@@ -595,8 +569,6 @@ export function registerUpdateJobStatusTool(server: McpServer) {
         'Report progress on a claimed ClaudeJob. Allowed transitions from CLAIMED/RUNNING: ' +
         'running (start), done (finished), failed (error), skipped (no-op exit). ' +
         'The Bearer token must match the token that claimed the job. ' +
-        'Stamps started_at on running and finished_at on done/failed/skipped, and backfills ' +
-        'claimed_at/started_at when missing so claimed_at ≤ started_at ≤ finished_at always holds. ' +
         'Before marking done: call verify_task_against_plan first — done is rejected when ' +
         'verify_result is null, EMPTY (unless task.verify_only is true), or when the verify level ' +
         'doesn’t meet task.verify_required: ALIGNED-only is strict; ALIGNED_OR_PARTIAL accepts ' +
@@ -636,8 +608,6 @@ export function registerUpdateJobStatusTool(server: McpServer) {
           select: {
             id: true,
             status: true,
-            claimed_at: true,
-            started_at: true,
             claimed_by_token_id: true,
             user_id: true,
             product_id: true,
@@ -781,11 +751,10 @@ export function registerUpdateJobStatusTool(server: McpServer) {
           where: { id: job_id },
           data: {
             status: dbStatus,
-            ...resolveJobTimestamps(
-              actualStatus,
-              { claimed_at: job.claimed_at, started_at: job.started_at },
-              now,
-            ),
+            ...(actualStatus === 'running' ? { started_at: now } : {}),
+            ...(actualStatus === 'done' || actualStatus === 'failed' || actualStatus === 'skipped'
+              ? { finished_at: now }
+              : {}),
             ...(branchToWrite !== undefined ? { branch: branchToWrite } : {}),
             ...(pushedAt !== undefined ? { pushed_at: pushedAt } : {}),
             ...(summary !== undefined ? { summary } : {}),