diff --git a/internal/cloud/server-workbench-http.test.ts b/internal/cloud/server-workbench-http.test.ts
index 7aec058b..4ff6aeb0 100644
--- a/internal/cloud/server-workbench-http.test.ts
+++ b/internal/cloud/server-workbench-http.test.ts
@@ -58,6 +58,81 @@ test("workbench projection diagnostics keeps projecting health distinct from cau
   assert.equal(diagnostics.projectionHealth, "projecting");
 });
 
+test("workbench trace event page exposes monotonic cursor range for restored mixed events", async () => {
+  const traceId = "trc_workbench_trace_mixed_cursor";
+  const session = {
+    id: "ses_workbench_trace_mixed_cursor",
+    projectId: "prj_workbench_authority_session",
+    agentId: "hwlab-code-agent",
+    status: "completed",
+    ownerUserId: ACTOR.id,
+    conversationId: "cnv_workbench_trace_mixed_cursor",
+    threadId: "thread-workbench-trace-mixed-cursor",
+    lastTraceId: traceId,
+    updatedAt: "2026-06-19T04:10:17.060Z",
+    session: { sessionStatus: "completed", lastTraceId: traceId, messages: [{ role: "user", text: "trace", traceId }] }
+  };
+  const mixedEvents = [
+    { seq: 1, source: "agentrun", sourceSeq: 1, type: "backend", status: "running", label: "agentrun:backend:run-created", createdAt: "2026-06-19T01:27:27.092Z" },
+    { seq: 5, source: "agentrun", sourceSeq: 1, type: "backend", status: "running", label: "agentrun:backend:run-created", createdAt: "2026-06-19T01:27:27.092Z" },
+    { seq: 6, source: "agentrun", sourceSeq: 4, type: "backend", status: "running", label: "agentrun:backend:runner-image-work-ready-smoke", createdAt: "2026-06-19T01:27:34.128Z" },
+    { seq: 2, source: "agentrun", sourceSeq: 4, type: "backend", status: "running", label: "agentrun:backend:runner-image-work-ready-smoke", createdAt: "2026-06-19T01:27:34.128Z" },
+    { seq: 3, source: "agentrun", sourceSeq: 5, type: "backend", status: "running", label: "agentrun:backend:run-claimed", createdAt: "2026-06-19T01:27:34.324Z" },
+    { seq: 7, source: "agentrun", sourceSeq: 5, type: "backend", status: "running", label: "agentrun:backend:run-claimed", createdAt: "2026-06-19T01:27:34.324Z" },
+    { seq: 4, type: "result", status: "completed", label: "agentrun:result:completed", terminal: true, createdAt: "2026-06-19T01:27:34.324Z" },
+    { seq: 1, type: "request", status: "accepted", label: "agentrun:request:accepted", createdAt: "2026-06-19T04:10:15.362Z" },
+    { seq: 2, type: "backend", status: "running", label: "agentrun:run:reused", createdAt: "2026-06-19T04:10:15.664Z" },
+    { seq: 3, type: "backend", status: "running", label: "agentrun:command:created", createdAt: "2026-06-19T04:10:16.013Z" },
+    { seq: 4, type: "backend", status: "running", label: "agentrun:runner-job:ensured", createdAt: "2026-06-19T04:10:17.060Z" }
+  ];
+  const accessController = {
+    store: {
+      async getAgentSession(sessionId) { return sessionId === session.id ? session : null; },
+      async getAgentSessionByTraceId(requestTraceId) { return requestTraceId === traceId ? session : null; }
+    },
+    async ensureBootstrap() {},
+    async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
+  };
+  const runtimeStore = {
+    async queryAgentTraceEvents(input = {}) {
+      assert.equal(input.traceId, traceId);
+      return { events: mixedEvents, count: mixedEvents.length };
+    }
+  };
+  const server = createCloudApiServer({ accessController, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
+  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
+
+  try {
+    const { port } = server.address();
+    const trace = await getJson(port, `/v1/workbench/traces/${encodeURIComponent(traceId)}/events?limit=25`);
+    assert.equal(trace.status, 200);
+    assert.equal(trace.body.events.length, mixedEvents.length);
+    assert.deepEqual(trace.body.events.map((event) => event.seq), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
+    assert.equal(trace.body.events[0].label, "agentrun:backend:run-created");
+    assert.equal(trace.body.events.at(-1).label, "agentrun:runner-job:ensured");
+    assert.deepEqual(trace.body.range, { afterSeq: 0, fromSeq: 1, toSeq: 11, limit: 25, returned: 11, total: 11 });
+    assert.equal(trace.body.nextSeq, 11);
+    assert.equal(trace.body.hasMore, false);
+    assert.equal(trace.body.nextCursor, null);
+
+    const middle = await getJson(port, `/v1/workbench/traces/${encodeURIComponent(traceId)}/events?cursor=seq:4&limit=3`);
+    assert.equal(middle.status, 200);
+    assert.deepEqual(middle.body.events.map((event) => event.seq), [5, 6, 7]);
+    assert.deepEqual(middle.body.range, { afterSeq: 4, fromSeq: 5, toSeq: 7, limit: 3, returned: 3, total: 11 });
+    assert.equal(middle.body.hasMore, true);
+    assert.equal(middle.body.nextSeq, 7);
+    assert.equal(middle.body.nextCursor, "seq:7");
+
+    const empty = await getJson(port, `/v1/workbench/traces/${encodeURIComponent(traceId)}/events?cursor=seq:999999&limit=5`);
+    assert.equal(empty.status, 200);
+    assert.deepEqual(empty.body.events, []);
+    assert.deepEqual(empty.body.range, { afterSeq: 999999, fromSeq: null, toSeq: null, limit: 5, returned: 0, total: 11 });
+    assert.equal(empty.body.nextSeq, 999999);
+  } finally {
+    await new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()));
+  }
+});
+
 test("workbench read model exposes session, messages, turn, and trace without write repair", async () => {
   const traceStore = createCodeAgentTraceStore();
   const results = createCodeAgentChatResultStore();
diff --git a/internal/cloud/server-workbench-http.ts b/internal/cloud/server-workbench-http.ts
index c24ced08..5e6cb9ae 100644
--- a/internal/cloud/server-workbench-http.ts
+++ b/internal/cloud/server-workbench-http.ts
@@ -730,7 +730,7 @@ function turnSnapshot({ projection, result, session, trace }) {
 
 function traceEventPage(snapshot, options) {
   const sourceEvents = Array.isArray(snapshot?.events) ? snapshot.events : [];
-  const indexed = sourceEvents.map((event, index) => ({ event, seq: eventSeq(event, index) }));
+  const indexed = normalizedTracePageEvents(sourceEvents);
   const startIndex = indexed.findIndex((item) => item.seq > options.afterSeq);
   const offset = startIndex >= 0 ? startIndex : indexed.length;
   const page = indexed.slice(offset, offset + options.limit);
@@ -756,6 +756,39 @@ function traceEventPage(snapshot, options) {
   };
 }
 
+function normalizedTracePageEvents(sourceEvents) {
+  return sourceEvents
+    .map((event, index) => ({
+      event,
+      sourceIndex: index,
+      persistedSeq: eventSeq(event, index),
+      sourceSeq: positiveTraceInteger(event?.sourceSeq),
+      createdAtMs: traceEventTimestampMs(event)
+    }))
+    .sort(compareTracePageEvents)
+    .map((item, index) => ({ event: item.event, seq: index + 1 }));
+}
+
+function compareTracePageEvents(left, right) {
+  if (left.createdAtMs !== right.createdAtMs) return left.createdAtMs - right.createdAtMs;
+  if (left.sourceSeq !== right.sourceSeq) return left.sourceSeq - right.sourceSeq;
+  if (left.persistedSeq !== right.persistedSeq) return left.persistedSeq - right.persistedSeq;
+  return left.sourceIndex - right.sourceIndex;
+}
+
+function traceEventTimestampMs(event) {
+  for (const value of [event?.createdAt, event?.occurredAt, event?.timestamp, event?.appendedAt]) {
+    const parsed = Date.parse(String(value ?? ""));
+    if (Number.isFinite(parsed)) return parsed;
+  }
+  return Number.MAX_SAFE_INTEGER;
+}
+
+function positiveTraceInteger(value) {
+  const parsed = Number(value);
+  return Number.isFinite(parsed) && parsed > 0 ? Math.trunc(parsed) : Number.MAX_SAFE_INTEGER;
+}
+
 function tracePageOptions(url) {
   const cursor = textValue(url.searchParams.get("cursor"));
   const cursorSeq = cursor.startsWith("seq:") ? Number.parseInt(cursor.slice(4), 10) : NaN;
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/projector-resume.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/projector-resume.spec.ts
index b1a4c091..f620ea7f 100644
--- a/web/hwlab-cloud-web/tests/workbench-e2e/specs/projector-resume.spec.ts
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/projector-resume.spec.ts
@@ -35,6 +35,7 @@ test.describe("durable projector resume", () => {
     expect(traceBody.traceStatus).toBe("completed");
     expect(traceBody.projectionStatus).toBe("caught-up");
     expect(traceBody.projectionHealth).toBe("caught-up");
+    expect(traceBody.events.map((event: { seq?: number }) => event.seq)).toEqual([1, 2, 3, 4, 5, 6, 7]);
     expect(traceBody.range).toMatchObject({ afterSeq: 0, fromSeq: 1, toSeq: 7, returned: 7, total: 7 });
 
     const emptyTracePage = await page.request.get(`/v1/workbench/traces/${traceId}/events?cursor=seq:999999&limit=5`);
@@ -47,6 +48,7 @@ test.describe("durable projector resume", () => {
     const finalCard = page.locator(`${selectors.messageCard}[data-role="agent"]`).filter({ hasText: "fake projector resume completed from durable checkpoint" });
     await expect(finalCard).toHaveAttribute("data-status", "completed");
     await expect(page.locator(`${selectors.traceTimeline}[data-status="completed"]`).last()).toBeVisible();
+    expect(await finalCard.innerText()).not.toContain("暂无可读 Trace");
     await expect(page.locator(selectors.commandSend)).toHaveAttribute("data-action", "turn");
     await saveScreenshot(page, testInfo, "projector-resume-after-catchup");