@@ -0,0 +1,10 @@
+---
+'@object-ui/plugin-detail': patch
+---
+
+refactor(plugin-detail): the record timeline stream pairs audit entries with activity rows by the spec's `RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES`
+
+Clause-②: no
+Metadata-protocol: none
+
+The 动态 stream used to keep its own copy of the audit action to activity type pairs (`create`/`created`, `update`/`updated`, `delete`/`deleted`). It now reads `RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES` from `@objectstack/spec/api`, the same set the server's `timeline` count steps aside, so the badge and the drawn rows cannot fold different types. No behaviour change: the same three pairs fold, and any other audit action (`restore`, an unknown action) pairs with no activity row.
@@ -20,6 +20,7 @@ import { describe, it, expect, afterEach } from 'vitest';
 import { render, screen, cleanup, fireEvent, within } from '@testing-library/react';
 import { DiscussionContextProvider } from '@object-ui/react';
 import type { FeedItem } from '@object-ui/types';
+import { RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES } from '@objectstack/spec/api';
 import {
   auditEntriesToFeedItems,
   filterTimelineStream,
@@ -399,3 +400,34 @@ describe('one action, one row: an activity row carries its audit entry (objectst
     expect(container.querySelectorAll('[data-record-timeline-peek-row]')).toHaveLength(2);
   });
 });
+
+describe("the stream folds exactly the spec's RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES, the set the server's count steps aside", () => {
+  const at = (ms: number) => new Date(Date.UTC(2026, 10, 2, 9, 0, 0) + ms).toISOString();
+  const row = (activityType: string) =>
+    ({ id: 'row', type: 'field_change', actor: 'Dev Admin', body: 'Activity', createdAt: at(0), activityType, actorId: 'u1' }) as FeedItem;
+  const entry = (action: string) =>
+    auditEntriesToFeedItems(
+      [{ id: 1, action, created_at: at(100), user_id: 'u1', user_name: 'Dev Admin', changes: [{ field: 'company', label: 'Company', from: 'A', to: 'B' }] }],
+      { unknownUser: 'Unknown' },
+    );
+  const pairs = (action: string, activityType: string) =>
+    mergeTimelineStream([row(activityType)], entry(action)).some((item) => fieldHistoryOf(item)?.id === 'audit:1');
+  const folded = Object.entries(RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES);
+  const foldedTypes = [...new Set(Object.values(RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES) as string[])];
+
+  it('the spec names the three write actions', () => {
+    expect(folded.map(([action]) => action).sort()).toEqual(['create', 'delete', 'update']);
+  });
+
+  it.each(folded)('the audit `%s` entry pairs with the activity `%s` row, and with no other folded type', (action, activityType) => {
+    expect(pairs(action, activityType)).toBe(true);
+    for (const other of foldedTypes.filter((t) => t !== activityType)) expect(pairs(action, other)).toBe(false);
+  });
+
+  it.each(['restore', 'unknown_action', 'toString', 'constructor', '__proto__', 'hasOwnProperty'])(
+    'an audit `%s` entry, outside the spec constant, pairs with no activity row',
+    (action) => {
+      for (const activityType of foldedTypes) expect(pairs(action, activityType)).toBe(false);
+    },
+  );
+});
@@ -20,7 +20,7 @@
  */
 
 import * as React from 'react';
-import { RECORD_TIMELINE_UPDATE_ACTIVITY_TYPE } from '@objectstack/spec/api';
+import { RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES, RECORD_TIMELINE_UPDATE_ACTIVITY_TYPE } from '@objectstack/spec/api';
 import type { FeedItem } from '@object-ui/types';
 
 /**
@@ -160,12 +160,17 @@ const timeOf = (item: FeedItem): number => {
  */
 export const TIMELINE_PAIR_WINDOW_MS = 5000;
 
-/** The ledger's write actions and the activity type the same action writes. */
-const AUDIT_ACTION_TO_ACTIVITY_TYPE: Readonly<Record<string, string>> = {
-  create: 'created',
-  update: RECORD_TIMELINE_UPDATE_ACTIVITY_TYPE,
-  delete: 'deleted',
-};
+/**
+ * The activity type the ledger write action `action` writes, or undefined for
+ * an action the spec does not fold (`restore`, an unknown action, a prototype
+ * key such as `toString`). The pairs are the spec's
+ * `RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES`, the same set the server's
+ * `timeline` count steps aside, so the badge and the drawn rows fold alike.
+ */
+function foldedActivityTypeOf(action: string | undefined): string | undefined {
+  if (!action || !Object.prototype.hasOwnProperty.call(RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES, action)) return undefined;
+  return RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES[action as keyof typeof RECORD_TIMELINE_FOLDED_ACTIVITY_TYPES];
+}
 
 /** One actor on both sides: the same user id, or, where neither names one, the same name. */
 function sameActor(activity: FeedItem, audit: FeedItem & AuditFeedFacts): boolean {
@@ -183,7 +188,7 @@ function sameActor(activity: FeedItem, audit: FeedItem & AuditFeedFacts): boolea
  * in ms, or -1.
  */
 function pairGap(activity: FeedItem, audit: FeedItem & AuditFeedFacts): number {
-  const activityType = audit.auditAction ? AUDIT_ACTION_TO_ACTIVITY_TYPE[audit.auditAction] : undefined;
+  const activityType = foldedActivityTypeOf(audit.auditAction);
   if (!activityType || activity.activityType !== activityType || activity.parentId) return -1;
   if (!sameActor(activity, audit)) return -1;
   const gap = Math.abs(timeOf(activity) - timeOf(audit));