diff --git a/internal/cloud/server-workbench-http.test.ts b/internal/cloud/server-workbench-http.test.ts
index 0690a482..5017ab0b 100644
--- a/internal/cloud/server-workbench-http.test.ts
+++ b/internal/cloud/server-workbench-http.test.ts
@@ -138,12 +138,7 @@ test("workbench trace event page exposes monotonic cursor range for restored mix
     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 runtimeStore = createDurableFactsRuntimeStore({ sessions: [{ session, events: mixedEvents, status: "completed" }] });
   const server = createCloudApiServer({ accessController, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
@@ -207,7 +202,7 @@ test("workbench read model exposes session, messages, turn, and trace without wr
       secretMaterialStored: false
     }
   };
-  const listInputs = [];
+  const factQueries = [];
   traceStore.append(traceId, { type: "request", status: "accepted", label: "request:accepted" });
   traceStore.append(traceId, { type: "result", status: "completed", label: "result:completed", terminal: true });
   results.set(traceId, {
@@ -224,7 +219,6 @@ test("workbench read model exposes session, messages, turn, and trace without wr
   const accessController = {
     store: {
       async listAgentSessionsForUser(input = {}) {
-        listInputs.push(input);
         return [session];
       },
       async getAgentSession(sessionId) { return sessionId === session.id ? session : null; },
@@ -235,7 +229,22 @@ test("workbench read model exposes session, messages, turn, and trace without wr
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: results });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [
+        { seq: 1, type: "request", status: "accepted", label: "request:accepted", createdAt: "2026-06-17T00:00:00.000Z" },
+        { seq: 2, type: "result", status: "completed", label: "result:completed", terminal: true, createdAt: "2026-06-17T00:00:03.000Z" }
+      ],
+      status: "completed",
+      finalText: "pong",
+      runId: "run_workbench_read_model",
+      commandId: "cmd_workbench_read_model",
+      lastProjectedSeq: 2
+    }],
+    queries: factQueries
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: results });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -245,13 +254,13 @@ test("workbench read model exposes session, messages, turn, and trace without wr
     assert.equal(sessions.body.contractVersion, "workbench-sessions-v1");
     assert.equal(sessions.body.sessions[0].sessionId, session.id);
     assert.equal(sessions.body.sessions[0].turnSummary.traceId, traceId);
-    assert.equal(listInputs[0].projectId, undefined);
-    assert.equal(listInputs[0].limit, 21);
+    assert.equal(factQueries[0].projectId, undefined);
+    assert.equal(factQueries[0].limit, 21);
 
     const staleProject = await getJson(port, `/v1/workbench/sessions?projectId=prj_stale_filter&includeSessionId=${encodeURIComponent(session.id)}`);
     assert.equal(staleProject.status, 400);
     assert.equal(staleProject.body.error.code, "workbench_authority_removed");
-    assert.equal(listInputs.length, 1);
+    assert.equal(factQueries.length, 1);
 
     const detail = await getJson(port, `/v1/workbench/sessions/${encodeURIComponent(session.id)}`);
     assert.equal(detail.status, 200);
@@ -333,14 +342,11 @@ test("workbench read model recovers trace events from durable projection without
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  let traceQueryCount = 0;
-  const runtimeStore = {
-    async queryAgentTraceEvents(params = {}) {
-      traceQueryCount += 1;
-      assert.equal(params.traceId, traceId);
-      return { events: durableEvents, count: durableEvents.length };
-    }
-  };
+  const factQueries = [];
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{ session, events: durableEvents, status: "completed", finalText: "durable pong", lastProjectedSeq: 2 }],
+    queries: factQueries
+  });
   const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
@@ -362,7 +368,7 @@ test("workbench read model recovers trace events from durable projection without
     assert.equal(trace.body.events.length, 2);
     assert.equal(trace.body.traceStatus, "completed");
     assert.equal(trace.body.hasMore, false);
-    assert.equal(traceQueryCount, 1);
+    assert.ok(factQueries.length >= 3);
   } finally {
     await new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()));
   }
@@ -415,7 +421,21 @@ test("workbench read model projects terminal result atomically across session, m
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: results });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [
+        { seq: 1, type: "request", status: "accepted", label: "request:accepted", createdAt: "2026-06-17T02:09:58.000Z" },
+        { seq: 2, type: "result", status: "completed", label: "result:completed", terminal: true, createdAt: "2026-06-17T02:10:00.000Z" }
+      ],
+      status: "completed",
+      finalText,
+      runId: "run_workbench_terminal_atomic",
+      commandId: "cmd_workbench_terminal_atomic",
+      lastProjectedSeq: 2
+    }]
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: results });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -498,7 +518,15 @@ test("workbench read model projects current turn running state from trace projec
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: createCodeAgentChatResultStore() });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [{ seq: 1, type: "backend", status: "running", label: "runner:created", terminal: false, createdAt: session.updatedAt }],
+      status: "running",
+      lastProjectedSeq: 1
+    }]
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -536,7 +564,15 @@ test("workbench read model projects current turn running state for idle session
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: createCodeAgentChatResultStore() });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [{ seq: 1, type: "backend", status: "running", label: "runner:created", terminal: false, createdAt: session.updatedAt }],
+      status: "running",
+      lastProjectedSeq: 1
+    }]
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -598,7 +634,21 @@ test("workbench read model projects completed current turn for idle session summ
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
   const backendPerformanceStore = createBackendPerformanceStore({ env: { POD_NAMESPACE: "hwlab-v03", HWLAB_GITOPS_TARGET: "v03", HWLAB_RUNTIME_LANE: "v03", HWLAB_CODE_AGENT_AGENTRUN_PROVIDER_ID: "D601" } });
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: results, backendPerformanceStore });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [
+        { seq: 1, type: "request", status: "accepted", label: "request:accepted", createdAt: "2026-06-17T00:02:58.000Z" },
+        { seq: 2, type: "result", status: "completed", label: "result:completed", terminal: true, createdAt: "2026-06-17T00:03:00.000Z" }
+      ],
+      status: "completed",
+      finalText,
+      runId: "run_workbench_idle_completed",
+      commandId: "cmd_workbench_idle_completed",
+      lastProjectedSeq: 2
+    }]
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: results, backendPerformanceStore });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -685,7 +735,21 @@ test("workbench read model lets terminal result override stale running session s
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const server = createCloudApiServer({ accessController, traceStore, codeAgentChatResults: results });
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [
+        { seq: 1, type: "backend", status: "running", label: "runner:created", terminal: false, createdAt: "2026-06-18T16:30:00.000Z" },
+        { seq: 2, type: "result", status: "completed", label: "result:completed", terminal: true, createdAt: "2026-06-18T16:31:04.000Z" }
+      ],
+      status: "completed",
+      finalText,
+      runId: "run_workbench_stale_running_completed",
+      commandId: "cmd_workbench_stale_running_completed",
+      lastProjectedSeq: 2
+    }]
+  });
+  const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: results });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
   try {
@@ -720,7 +784,7 @@ test("workbench read model lets terminal result override stale running session s
   }
 });
 
-test("workbench session list uses compact trace result without durable trace hydration", async () => {
+test("workbench session list uses durable projection checkpoint without trace/result hydration", async () => {
   const traceStore = createCodeAgentTraceStore();
   const traceId = "trc_workbench_compact_list_summary";
   const finalText = "compact list summary OK";
@@ -771,13 +835,22 @@ test("workbench session list uses compact trace result without durable trace hyd
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  let durableQueryCount = 0;
-  const runtimeStore = {
-    async queryAgentTraceEvents() {
-      durableQueryCount += 1;
-      throw new Error("session list must not hydrate durable trace events");
-    }
-  };
+  const factQueries = [];
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: [
+        { seq: 1, sourceSeq: 1, type: "request", status: "accepted", label: "request:accepted", createdAt: "2026-06-19T15:39:10.000Z" },
+        { seq: 42, sourceSeq: 42, type: "result", status: "completed", label: "result:completed", terminal: true, createdAt: "2026-06-19T15:40:00.000Z" }
+      ],
+      status: "completed",
+      finalText,
+      runId: "run_workbench_compact_list_summary",
+      commandId: "cmd_workbench_compact_list_summary",
+      lastProjectedSeq: 42
+    }],
+    queries: factQueries
+  });
   const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
@@ -791,13 +864,13 @@ test("workbench session list uses compact trace result without durable trace hyd
     assert.equal(sessions.body.sessions[0].turnSummary.status, "completed");
     assert.equal(sessions.body.sessions[0].turnSummary.eventCount, 42);
     assert.equal(sessions.body.sessions[0].projectionStatus, "caught-up");
-    assert.equal(durableQueryCount, 0);
+    assert.ok(factQueries.length >= 1);
   } finally {
     await new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()));
   }
 });
 
-test("workbench read model recovers terminal session status from durable trace", async () => {
+test("workbench read model reads terminal session status from durable facts", async () => {
   const traceStore = createCodeAgentTraceStore();
   const traceId = "trc_workbench_durable_terminal_after_memory_running";
   const session = {
@@ -833,14 +906,9 @@ test("workbench read model recovers terminal session status from durable trace",
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  let durableQueryCount = 0;
-  const runtimeStore = {
-    async queryAgentTraceEvents(params = {}) {
-      durableQueryCount += 1;
-      assert.equal(params.traceId, traceId);
-      return { events: durableEvents, count: durableEvents.length };
-    }
-  };
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{ session, events: durableEvents, status: "completed", finalText: "OK", lastProjectedSeq: 2 }]
+  });
   const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: createCodeAgentChatResultStore() });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
@@ -848,17 +916,15 @@ test("workbench read model recovers terminal session status from durable trace",
     const { port } = server.address();
     const sessions = await getJson(port, `/v1/workbench/sessions?includeSessionId=${encodeURIComponent(session.id)}`);
     assert.equal(sessions.status, 200);
-    assert.equal(sessions.body.sessions[0].status, "running");
-    assert.equal(sessions.body.sessions[0].running, true);
-    assert.equal(sessions.body.sessions[0].terminal, false);
-    assert.equal(durableQueryCount, 0);
+    assert.equal(sessions.body.sessions[0].status, "completed");
+    assert.equal(sessions.body.sessions[0].running, false);
+    assert.equal(sessions.body.sessions[0].terminal, true);
 
     const detail = await getJson(port, `/v1/workbench/sessions/${encodeURIComponent(session.id)}`);
     assert.equal(detail.status, 200);
     assert.equal(detail.body.session.status, "completed");
     assert.equal(detail.body.session.running, false);
     assert.equal(detail.body.session.terminal, true);
-    assert.equal(durableQueryCount, 1);
 
     const messages = await getJson(port, `/v1/workbench/sessions/${encodeURIComponent(session.id)}/messages?limit=10`);
     assert.equal(messages.status, 200);
@@ -927,12 +993,17 @@ test("workbench read model keeps non-terminal durable tool completed events out
     async ensureBootstrap() {},
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
-  const runtimeStore = {
-    async queryAgentTraceEvents(params = {}) {
-      assert.equal(params.traceId, traceId);
-      return { events: durableEvents, count: durableEvents.length };
-    }
-  };
+  const runtimeStore = createDurableFactsRuntimeStore({
+    sessions: [{
+      session,
+      events: durableEvents,
+      status: "running",
+      runId: "run_workbench_nonterminal_tool_completed",
+      commandId: "cmd_workbench_nonterminal_tool_completed",
+      projectionStatus: "projecting",
+      lastProjectedSeq: 2
+    }]
+  });
   const server = createCloudApiServer({ accessController, traceStore, runtimeStore, codeAgentChatResults: results });
   await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
 
@@ -1053,7 +1124,7 @@ test("workbench read model exposes runtime trace projection query failures as pr
     async authenticate() { return { ok: true, actor: ACTOR, session: { id: "uss_workbench_reader" } }; }
   };
   const runtimeStore = {
-    async queryAgentTraceEvents() {
+    async queryWorkbenchFacts() {
       const error = new Error("runtime query failed");
       error.code = "TEST_RUNTIME_QUERY_FAILED";
       throw error;
@@ -1065,18 +1136,12 @@ test("workbench read model exposes runtime trace projection query failures as pr
   try {
     const { port } = server.address();
     const turn = await getJson(port, `/v1/workbench/turns/${encodeURIComponent(traceId)}`);
-    assert.equal(turn.status, 200);
-    assert.equal(turn.body.turn.status, "running");
-    assert.equal(turn.body.projectionHealth, "unavailable");
-    assert.equal(turn.body.projection.blocker.code, "projection_store_unavailable");
-    assert.equal(turn.body.blocker.code, "projection_store_unavailable");
+    assert.equal(turn.status, 503);
+    assert.equal(turn.body.error.code, "projection_store_unavailable");
 
     const trace = await getJson(port, `/v1/workbench/traces/${encodeURIComponent(traceId)}/events?limit=10`);
-    assert.equal(trace.status, 200);
-    assert.equal(trace.body.events.length, 1);
-    assert.equal(trace.body.traceStatus, "running");
-    assert.equal(trace.body.projectionHealth, "unavailable");
-    assert.equal(trace.body.projection.blocker.code, "projection_store_unavailable");
+    assert.equal(trace.status, 503);
+    assert.equal(trace.body.error.code, "projection_store_unavailable");
   } finally {
     await new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()));
   }
@@ -1090,6 +1155,198 @@ async function getJson(port, path) {
   };
 }
 
+function createDurableFactsRuntimeStore({ sessions = [], queryError = null, queries = [] } = {}) {
+  const facts = emptyFacts();
+  for (const item of sessions) mergeFacts(facts, buildDurableFactsForSession(item));
+  return {
+    queries,
+    async queryWorkbenchFacts(params = {}) {
+      queries.push(params);
+      if (queryError) throw queryError;
+      const filtered = filterFacts(facts, params);
+      return {
+        facts: filtered,
+        count: Object.values(filtered).reduce((sum, rows) => sum + rows.length, 0),
+        persistence: { adapter: "test-durable-workbench-facts", durable: true }
+      };
+    }
+  };
+}
+
+function buildDurableFactsForSession({ session, events = [], status = null, finalText = null, runId = null, commandId = null, projectionStatus = null, projectionHealth = "healthy", lastProjectedSeq = null } = {}) {
+  const traceId = session.lastTraceId ?? session.session?.lastTraceId;
+  const projectedStatus = normalizeTestStatus(status ?? session.status);
+  const terminal = testTerminalStatuses.has(projectedStatus);
+  const normalizedMessages = normalizeTestMessages(session, { traceId, status: projectedStatus, finalText, terminal });
+  const normalizedEvents = normalizeTestEvents(events, session, { traceId });
+  const projectedSeq = Number.isFinite(Number(lastProjectedSeq)) ? Number(lastProjectedSeq) : Math.max(normalizedEvents.length, normalizedMessages.length, 0);
+  const checkpointStatus = projectionStatus ?? (terminal ? "caught_up" : "projecting");
+  return {
+    sessions: [{
+      sessionId: session.id,
+      ownerUserId: session.ownerUserId,
+      ownerRole: session.ownerRole ?? null,
+      projectId: session.projectId ?? null,
+      conversationId: session.conversationId ?? null,
+      threadId: session.threadId ?? null,
+      agentId: session.agentId ?? "hwlab-code-agent",
+      status: projectedStatus,
+      lastTraceId: traceId,
+      providerProfile: session.session?.providerProfile ?? null,
+      projectedSeq,
+      sourceSeq: projectedSeq,
+      sourceEventId: traceId,
+      terminal,
+      sealed: terminal,
+      createdAt: session.startedAt ?? session.createdAt ?? session.updatedAt ?? null,
+      updatedAt: session.updatedAt ?? session.endedAt ?? session.startedAt ?? null,
+      valuesRedacted: true
+    }],
+    messages: normalizedMessages,
+    parts: normalizedMessages.filter((message) => message.text).map((message, index) => ({
+      partId: `prt_${session.id}_${index}`,
+      messageId: message.messageId,
+      sessionId: session.id,
+      turnId: message.turnId,
+      traceId: message.traceId,
+      partIndex: 0,
+      partType: "text",
+      status: message.status,
+      text: message.text,
+      projectedSeq: message.projectedSeq,
+      sourceSeq: message.sourceSeq,
+      sourceEventId: message.sourceEventId,
+      terminal: message.terminal,
+      sealed: message.sealed,
+      updatedAt: message.updatedAt,
+      valuesRedacted: true
+    })),
+    turns: traceId ? [{
+      turnId: traceId,
+      sessionId: session.id,
+      traceId,
+      messageId: normalizedMessages.find((message) => message.role !== "user")?.messageId ?? null,
+      status: projectedStatus,
+      projectedSeq,
+      sourceSeq: projectedSeq,
+      sourceEventId: traceId,
+      terminal,
+      sealed: terminal,
+      finalResponse: finalText ? { text: finalText, status: projectedStatus, traceId, valuesPrinted: false } : null,
+      diagnostic: { projectionStatus: checkpointStatus, projectionHealth, valuesRedacted: true },
+      createdAt: session.startedAt ?? session.updatedAt ?? null,
+      updatedAt: session.updatedAt ?? null,
+      valuesRedacted: true
+    }] : [],
+    traceEvents: normalizedEvents,
+    checkpoints: traceId ? [{
+      traceId,
+      sessionId: session.id,
+      turnId: traceId,
+      runId,
+      commandId,
+      projectedSeq,
+      sourceSeq: projectedSeq,
+      sourceEventId: traceId,
+      projectionStatus: checkpointStatus,
+      projectionHealth,
+      terminal,
+      sealed: terminal,
+      diagnostic: { projectionStatus: checkpointStatus, projectionHealth, valuesRedacted: true },
+      createdAt: session.startedAt ?? session.updatedAt ?? null,
+      updatedAt: session.updatedAt ?? null,
+      valuesRedacted: true
+    }] : []
+  };
+}
+
+function normalizeTestMessages(session, { traceId, status, finalText, terminal }) {
+  const raw = Array.isArray(session.session?.messages) ? session.session.messages : [];
+  return raw.map((message, index) => {
+    const role = message.role ?? (index % 2 === 0 ? "user" : "agent");
+    const isAssistant = role === "agent" || role === "assistant";
+    const text = isAssistant && finalText ? finalText : String(message.text ?? message.content ?? "");
+    const messageStatus = isAssistant && finalText ? status : normalizeTestStatus(message.status ?? (role === "user" ? "sent" : status));
+    return {
+      messageId: message.messageId ?? `msg_${session.id}_${index}`,
+      sessionId: session.id,
+      turnId: message.turnId ?? traceId,
+      traceId: message.traceId ?? traceId,
+      role,
+      status: messageStatus,
+      projectedSeq: index + 1,
+      sourceSeq: index + 1,
+      sourceEventId: `${session.id}:message:${index}`,
+      terminal: isAssistant && terminal,
+      sealed: isAssistant && terminal,
+      text,
+      createdAt: message.createdAt ?? session.startedAt ?? session.updatedAt ?? null,
+      updatedAt: message.updatedAt ?? session.updatedAt ?? null,
+      valuesRedacted: true
+    };
+  });
+}
+
+function normalizeTestEvents(events, session, { traceId }) {
+  return events.map((event, index) => {
+    const seq = Number.isFinite(Number(event.seq)) ? Number(event.seq) : index + 1;
+    const sourceSeq = Number.isFinite(Number(event.sourceSeq)) ? Number(event.sourceSeq) : seq;
+    return {
+      ...event,
+      id: event.id ?? `wte_${session.id}_${index}`,
+      traceId: event.traceId ?? traceId,
+      sessionId: event.sessionId ?? session.id,
+      turnId: event.turnId ?? traceId,
+      messageId: event.messageId ?? null,
+      sourceSeq,
+      sourceEventId: event.sourceEventId ?? `${traceId}:${sourceSeq}:${index}`,
+      projectedSeq: seq,
+      eventType: event.eventType ?? event.type ?? event.label ?? "event",
+      terminal: event.terminal === true,
+      sealed: event.terminal === true,
+      occurredAt: event.occurredAt ?? event.createdAt ?? session.updatedAt ?? null,
+      updatedAt: event.updatedAt ?? event.createdAt ?? session.updatedAt ?? null,
+      valuesRedacted: true
+    };
+  });
+}
+
+function filterFacts(facts, params = {}) {
+  const filtered = {
+    sessions: facts.sessions.filter((record) => matchesFact(record, params, ["sessionId", "ownerUserId", "projectId", "conversationId", "threadId", "status"]) && (!params.traceId || record.lastTraceId === params.traceId)),
+    messages: facts.messages.filter((record) => matchesFact(record, params, ["messageId", "sessionId", "turnId", "traceId", "role", "status"])),
+    parts: facts.parts.filter((record) => matchesFact(record, params, ["partId", "messageId", "sessionId", "turnId", "traceId", "partType", "status"])),
+    turns: facts.turns.filter((record) => matchesFact(record, params, ["turnId", "sessionId", "traceId", "messageId", "status"])),
+    traceEvents: facts.traceEvents.filter((record) => matchesFact(record, params, ["id", "traceId", "sessionId", "turnId", "messageId", "eventType"])),
+    checkpoints: facts.checkpoints.filter((record) => matchesFact(record, params, ["traceId", "sessionId", "turnId", "runId", "commandId", "projectionStatus", "projectionHealth"]))
+  };
+  const limit = Number.parseInt(params.limit ?? "", 10);
+  if (!Number.isInteger(limit) || limit <= 0) return filtered;
+  return Object.fromEntries(Object.entries(filtered).map(([key, value]) => [key, value.slice(0, limit)]));
+}
+
+function matchesFact(record, params, fields) {
+  return fields.every((field) => params[field] === undefined || params[field] === null || record[field] === params[field]);
+}
+
+function mergeFacts(target, source) {
+  for (const key of Object.keys(target)) target[key].push(...source[key]);
+  return target;
+}
+
+function emptyFacts() {
+  return { sessions: [], messages: [], parts: [], turns: [], traceEvents: [], checkpoints: [] };
+}
+
+function normalizeTestStatus(value) {
+  const status = String(value ?? "").trim().toLowerCase().replace(/_/gu, "-");
+  if (status === "active" || status === "busy" || status === "processing") return "running";
+  if (status === "cancelled") return "canceled";
+  return status || "unknown";
+}
+
+const testTerminalStatuses = new Set(["completed", "failed", "blocked", "timeout", "canceled", "idle"]);
+
 async function getSseEvents(port, path, count) {
   const controller = new AbortController();
   const response = await fetch(`http://127.0.0.1:${port}${path}`, { signal: controller.signal });
diff --git a/internal/cloud/server-workbench-http.ts b/internal/cloud/server-workbench-http.ts
index f2caddad..97caea78 100644
--- a/internal/cloud/server-workbench-http.ts
+++ b/internal/cloud/server-workbench-http.ts
@@ -14,7 +14,7 @@ import {
   sendJson
 } from "./server-http-utils.ts";
 import { createWorkbenchReadModel } from "./workbench-read-model.ts";
-import { createWorkbenchTurnProjection, RUNNING_STATUSES, TERMINAL_STATUSES } from "./workbench-turn-projection.ts";
+import { createWorkbenchTurnProjection, durableTraceStatus, RUNNING_STATUSES, TERMINAL_STATUSES } from "./workbench-turn-projection.ts";
 
 const DEFAULT_PAGE_LIMIT = 50;
 const DEFAULT_SESSION_LIST_LIMIT = 20;
@@ -318,14 +318,21 @@ async function handleWorkbenchSessionList(response, url, options, actor) {
   const includeSessionId = safeSessionId(url.searchParams.get("includeSessionId"));
   const includeRouteId = includeSessionId ?? safeConversationId(url.searchParams.get("includeSessionId"));
   const readModel = createWorkbenchReadModel(options, actor);
-  const naturalPage = await (perf ? perf.measure("workbench_session_page_query", () => readModel.listSessions({ limit: limit + 1, offset })) : readModel.listSessions({ limit: limit + 1, offset }));
-  const pageSessions = naturalPage.slice(0, limit);
-  let responseSessions = pageSessions;
-  if (includeRouteId && !pageSessions.some((session) => sessionMatchesRouteId(session, includeRouteId))) {
-    const included = await (perf ? perf.measure("workbench_session_include_query", () => readModel.getSessionByRouteId(includeRouteId)) : readModel.getSessionByRouteId(includeRouteId));
-    if (included) responseSessions = [included, ...pageSessions];
+  const pageResult = await (perf ? perf.measure("workbench_session_page_query", () => readModel.queryFacts({ ownerUserId: actor.role === "admin" ? undefined : actor.id, limit: limit + offset + 1 })) : readModel.queryFacts({ ownerUserId: actor.role === "admin" ? undefined : actor.id, limit: limit + offset + 1 }));
+  if (pageResult.error) return sendJson(response, 503, workbenchProjectionStoreError(pageResult.error));
+  let pageFacts = pageResult.facts;
+  let naturalPage = visibleFactSessions(pageFacts, actor).slice(offset, offset + limit + 1);
+  if (includeRouteId && !naturalPage.some((session) => factSessionMatchesRouteId(session, includeRouteId))) {
+    const includeResult = await (perf ? perf.measure("workbench_session_include_query", () => queryFactsByRouteId(readModel, includeRouteId)) : queryFactsByRouteId(readModel, includeRouteId));
+    if (includeResult.error) return sendJson(response, 503, workbenchProjectionStoreError(includeResult.error));
+    const included = visibleFactSessions(includeResult.facts, actor)[0] ?? null;
+    if (included) {
+      pageFacts = mergeFactSets(pageFacts, includeResult.facts);
+      naturalPage = [included, ...naturalPage];
+    }
   }
-  const summaries = await (perf ? perf.measure("workbench_session_summary_projection", () => sessionListSummaries(readModel, responseSessions, options)) : sessionListSummaries(readModel, responseSessions, options));
+  const pageSessions = naturalPage.slice(0, limit);
+  const summaries = pageSessions.map((session) => factSessionSummary(session, pageFacts)).filter(Boolean);
   const hasMore = naturalPage.length > limit;
   sendJson(response, 200, {
     ok: true,
@@ -348,16 +355,428 @@ function sessionMatchesRouteId(session, routeId) {
   return Boolean(conversationId && session?.conversationId === conversationId);
 }
 
+async function queryFactsByRouteId(readModel, routeId) {
+  const sessionId = safeSessionId(routeId);
+  if (sessionId) return readModel.queryFacts({ sessionId, limit: MAX_PAGE_LIMIT });
+  const conversationId = safeConversationId(routeId);
+  if (conversationId) return readModel.queryFacts({ conversationId, limit: MAX_PAGE_LIMIT });
+  return { facts: emptyFactSet(), count: 0, durable: false, persistence: null };
+}
+
+function visibleFactSessions(facts, actor) {
+  return factArray(facts?.sessions)
+    .filter((session) => canActorReadFactSession(session, actor))
+    .sort(compareFactSessionsDesc);
+}
+
+function canActorReadFactSession(session, actor) {
+  if (!session || !actor) return false;
+  if (normalizeStatus(session.status) === "archived") return false;
+  if (actor.role === "admin") return true;
+  return session.ownerUserId === actor.id;
+}
+
+function factSessionMatchesRouteId(session, routeId) {
+  const sessionId = safeSessionId(routeId);
+  if (sessionId && factSessionId(session) === sessionId) return true;
+  const conversationId = safeConversationId(routeId);
+  return Boolean(conversationId && session?.conversationId === conversationId);
+}
+
+function factSessionSummary(session, facts = {}) {
+  const sessionId = factSessionId(session);
+  if (!sessionId) return null;
+  const traceId = factLastTraceId(session) ?? factLatestTraceIdForSession(facts, sessionId);
+  const projection = traceId ? factProjectionForTrace(facts, traceId) : null;
+  const turn = traceId ? factTurnForTrace(facts, traceId) : null;
+  const messages = factMessagesForSession(session, facts);
+  const status = normalizeStatus(turn?.status ?? session?.status);
+  return {
+    sessionId,
+    threadId: safeOpaqueId(session?.threadId) ?? (textValue(session?.threadId) || null),
+    agentId: session?.agentId ?? "hwlab-code-agent",
+    status,
+    running: RUNNING_STATUSES.has(status),
+    terminal: TERMINAL_STATUSES.has(status) && !RUNNING_STATUSES.has(status),
+    lastTraceId: traceId,
+    projection,
+    projectionStatus: projection?.projectionStatus ?? null,
+    projectionHealth: projection?.projectionHealth ?? null,
+    staleMs: projection?.staleMs ?? null,
+    blocker: projection?.blocker ?? null,
+    providerProfile: textValue(session?.providerProfile ?? session?.sessionJson?.providerProfile) || null,
+    messageCount: messages.length,
+    firstUserMessagePreview: firstUserPreview(messages),
+    updatedAt: factUpdatedAt(session),
+    turnSummary: turn ? {
+      turnId: factTurnId(turn, traceId),
+      traceId,
+      status: normalizeStatus(turn.status ?? status),
+      running: RUNNING_STATUSES.has(normalizeStatus(turn.status ?? status)),
+      terminal: TERMINAL_STATUSES.has(normalizeStatus(turn.status ?? status)) && !RUNNING_STATUSES.has(normalizeStatus(turn.status ?? status)),
+      eventCount: projection?.lastProjectedSeq ?? factTraceSnapshot(facts, traceId).eventCount,
+      projection,
+      projectionStatus: projection?.projectionStatus ?? null,
+      projectionHealth: projection?.projectionHealth ?? null,
+      staleMs: projection?.staleMs ?? null,
+      blocker: projection?.blocker ?? null,
+      updatedAt: factUpdatedAt(turn)
+    } : null,
+    valuesRedacted: true
+  };
+}
+
+function factSessionDetail(session, facts = {}) {
+  const sessionId = factSessionId(session);
+  return {
+    ...factSessionSummary(session, facts),
+    metadata: {
+      startedAt: session?.startedAt ?? session?.createdAt ?? null,
+      endedAt: session?.endedAt ?? null,
+      ownerUserId: session?.ownerUserId ?? null
+    },
+    messagePageUrl: sessionId ? `/v1/workbench/sessions/${encodeURIComponent(sessionId)}/messages` : null,
+    valuesRedacted: true,
+    secretMaterialStored: false
+  };
+}
+
+function factMessagesForSession(session, facts = {}) {
+  const sessionId = factSessionId(session);
+  if (!sessionId) return [];
+  const partsByMessageId = new Map();
+  for (const part of factArray(facts.parts)) {
+    if (part.sessionId !== sessionId) continue;
+    const messageId = textValue(part.messageId);
+    if (!messageId) continue;
+    const existing = partsByMessageId.get(messageId) ?? [];
+    existing.push(part);
+    partsByMessageId.set(messageId, existing);
+  }
+  return factArray(facts.messages)
+    .filter((message) => message.sessionId === sessionId)
+    .sort(compareFactMessagesAsc)
+    .map((message) => factMessageDto(message, partsByMessageId.get(message.messageId) ?? []))
+    .filter(Boolean);
+}
+
+function factMessageDto(message, parts = []) {
+  const messageId = safeMessageId(message?.messageId) || textValue(message?.messageId);
+  if (!messageId) return null;
+  const traceId = safeTraceId(message?.traceId) ?? null;
+  const text = projectionText(message?.text, message?.content, message?.message, message?.finalResponse);
+  const normalizedParts = parts.length > 0
+    ? [...parts].sort(compareFactPartsAsc).map((part) => factPartDto(part, messageId, traceId)).filter(Boolean)
+    : text ? [partFact({ type: "text", text, status: message?.status }, 0, messageId, traceId)] : [];
+  return {
+    messageId,
+    role: textValue(message?.role) || "agent",
+    sessionId: (safeSessionId(message?.sessionId) ?? textValue(message?.sessionId)) || null,
+    traceId,
+    turnId: safeTurnId(message?.turnId) || traceId,
+    status: normalizeStatus(message?.status),
+    parts: normalizedParts,
+    text: text || "",
+    textPreview: text ? text.slice(0, 240) : null,
+    createdAt: textValue(message?.createdAt) || null,
+    updatedAt: factUpdatedAt(message),
+    projectionStatus: null,
+    projectionHealth: null,
+    valuesRedacted: message?.valuesRedacted !== false
+  };
+}
+
+function factPartDto(part, messageId, traceId) {
+  const partId = safePartId(part?.partId) || textValue(part?.partId) || `prt_${hash(`${messageId}:${part?.partIndex ?? 0}:${part?.partType ?? part?.type ?? "text"}`).slice(0, 24)}`;
+  const text = projectionText(part?.text, part?.content, part?.message);
+  return {
+    partId,
+    messageId,
+    traceId: safeTraceId(part?.traceId) ?? traceId,
+    type: textValue(part?.partType ?? part?.type) || "text",
+    text: text || null,
+    status: normalizeStatus(part?.status),
+    toolName: textValue(part?.toolName ?? part?.name) || null,
+    createdAt: textValue(part?.createdAt ?? part?.occurredAt) || null,
+    valuesRedacted: part?.valuesRedacted !== false
+  };
+}
+
+function factTurnForTrace(facts = {}, traceId, turnId = null) {
+  const safeTrace = safeTraceId(traceId);
+  if (!safeTrace) return null;
+  const requestedTurn = safeTurnId(turnId);
+  const matches = factArray(facts.turns)
+    .filter((turn) => turn.traceId === safeTrace && (!requestedTurn || turn.turnId === requestedTurn || turn.turnId === safeTrace))
+    .sort(compareFactRecordsDesc);
+  return matches[0] ?? null;
+}
+
+function factTurnSnapshot({ turn = null, session = null, facts = {}, traceId, turnId = null } = {}) {
+  const safeTrace = safeTraceId(traceId);
+  const resolvedTurnId = factTurnId(turn, safeTrace) ?? safeTurnId(turnId) ?? safeTrace;
+  const status = normalizeStatus(turn?.status ?? session?.status);
+  const messages = session ? factMessagesForSession(session, facts) : [];
+  const userMessage = messages.find((message) => message.role === "user") ?? null;
+  const assistantMessage = [...messages].reverse().find((message) => isAssistantLikeRole(message.role)) ?? null;
+  const checkpoint = safeTrace ? factCheckpointForTrace(facts, safeTrace) : null;
+  const finalText = projectionText(turn?.finalResponse, turn?.assistantText, turn?.text, assistantMessage?.text);
+  const trace = factTraceSnapshot(facts, safeTrace);
+  return {
+    turnId: resolvedTurnId,
+    traceId: safeTrace,
+    status,
+    running: RUNNING_STATUSES.has(status),
+    terminal: TERMINAL_STATUSES.has(status) && !RUNNING_STATUSES.has(status),
+    sessionId: factSessionId(session) ?? turn?.sessionId ?? checkpoint?.sessionId ?? null,
+    threadId: safeOpaqueId(session?.threadId) ?? (textValue(session?.threadId) || null),
+    userMessageId: userMessage?.messageId ?? null,
+    assistantMessageId: assistantMessage?.messageId ?? turn?.messageId ?? null,
+    assistantText: finalText ?? null,
+    finalResponse: turn?.finalResponse ?? (finalText ? { text: finalText, status, traceId: safeTrace, valuesPrinted: false } : null),
+    agentRun: checkpoint ? {
+      runId: textValue(checkpoint.runId) || null,
+      commandId: textValue(checkpoint.commandId) || null,
+      status,
+      lastSeq: factSeq(checkpoint),
+      valuesRedacted: true
+    } : null,
+    trace: {
+      traceId: safeTrace,
+      status: trace.status,
+      eventCount: trace.eventCount,
+      updatedAt: trace.updatedAt
+    },
+    urls: {
+      self: resolvedTurnId ? `/v1/workbench/turns/${encodeURIComponent(resolvedTurnId)}` : null,
+      traceEvents: safeTrace ? `/v1/workbench/traces/${encodeURIComponent(safeTrace)}/events` : null
+    }
+  };
+}
+
+function factTraceSnapshot(facts = {}, traceId) {
+  const safeTrace = safeTraceId(traceId);
+  const events = factArray(facts.traceEvents)
+    .filter((event) => !safeTrace || event.traceId === safeTrace)
+    .sort(compareFactTraceEventsAsc)
+    .map(factTraceEventDto);
+  const status = durableTraceStatus(events);
+  const lastEvent = events.at(-1) ?? null;
+  return {
+    traceId: safeTrace,
+    status,
+    eventCount: events.length,
+    events,
+    lastEvent,
+    updatedAt: lastEvent?.updatedAt ?? lastEvent?.createdAt ?? factCheckpointForTrace(facts, safeTrace)?.updatedAt ?? null,
+    valuesRedacted: true,
+    secretMaterialStored: false
+  };
+}
+
+function factTraceEventDto(event, index) {
+  const seq = Number.isFinite(Number(event?.seq)) && Number(event.seq) > 0 ? Math.trunc(Number(event.seq)) : factSeq(event) || index + 1;
+  return {
+    ...event,
+    id: textValue(event?.id) || textValue(event?.sourceEventId) || null,
+    seq,
+    sourceSeq: factSeq(event) || seq,
+    type: textValue(event?.type ?? event?.eventType) || "event",
+    label: textValue(event?.label ?? event?.eventType ?? event?.type) || null,
+    status: normalizeStatus(event?.status),
+    createdAt: textValue(event?.createdAt ?? event?.occurredAt) || null,
+    updatedAt: factUpdatedAt(event),
+    valuesRedacted: event?.valuesRedacted !== false
+  };
+}
+
+function factProjectionForTrace(facts = {}, traceId) {
+  const checkpoint = factCheckpointForTrace(facts, traceId);
+  if (!checkpoint) {
+    return {
+      projectionStatus: "unknown",
+      projectionHealth: "unknown",
+      lastProjectedSeq: null,
+      sourceRunId: null,
+      sourceCommandId: null,
+      staleMs: null,
+      blocker: null,
+      updatedAt: null,
+      valuesRedacted: true
+    };
+  }
+  const projectionStatus = normalizeProjectionStatus(checkpoint.projectionStatus);
+  const projectionHealth = normalizeProjectionHealth(checkpoint.projectionHealth, projectionStatus);
+  const diagnostic = objectValue(checkpoint.diagnostic);
+  return {
+    projectionStatus,
+    projectionHealth,
+    lastProjectedSeq: factSeq(checkpoint),
+    sourceRunId: textValue(checkpoint.runId ?? checkpoint.sourceRunId) || null,
+    sourceCommandId: textValue(checkpoint.commandId ?? checkpoint.sourceCommandId) || null,
+    staleMs: null,
+    blocker: diagnostic.blocker ?? checkpoint.blocker ?? null,
+    updatedAt: factUpdatedAt(checkpoint),
+    valuesRedacted: true
+  };
+}
+
+function factCheckpointForTrace(facts = {}, traceId) {
+  const safeTrace = safeTraceId(traceId);
+  if (!safeTrace) return null;
+  return factArray(facts.checkpoints)
+    .filter((checkpoint) => checkpoint.traceId === safeTrace)
+    .sort(compareFactRecordsDesc)[0] ?? null;
+}
+
+function workbenchProjectionStoreError(error) {
+  return workbenchError("projection_store_unavailable", "Workbench durable projection store is unavailable.", { causeCode: error?.code ?? null });
+}
+
+function factSessionId(session) {
+  return safeSessionId(session?.sessionId ?? session?.id) ?? null;
+}
+
+function factLastTraceId(session) {
+  return safeTraceId(session?.lastTraceId ?? session?.traceId) ?? null;
+}
+
+function factLatestTraceIdForSession(facts = {}, sessionId) {
+  const turn = factArray(facts.turns).filter((item) => item.sessionId === sessionId).sort(compareFactRecordsDesc)[0] ?? null;
+  return safeTraceId(turn?.traceId) ?? null;
+}
+
+function factTurnId(turn, fallbackTraceId = null) {
+  return safeTurnId(turn?.turnId) ?? safeTraceId(turn?.turnId) ?? safeTraceId(fallbackTraceId) ?? null;
+}
+
+function factUpdatedAt(record) {
+  return textValue(record?.updatedAt ?? record?.occurredAt ?? record?.createdAt) || null;
+}
+
+function factSeq(record) {
+  for (const value of [record?.projectedSeq, record?.sourceSeq, record?.seq]) {
+    const parsed = Number(value);
+    if (Number.isFinite(parsed) && parsed >= 0) return Math.trunc(parsed);
+  }
+  return null;
+}
+
+function normalizeProjectionStatus(value) {
+  const status = normalizeStatus(value);
+  if (status === "caught-up") return "caught-up";
+  if (status === "caughtup") return "caught-up";
+  return ["projecting", "blocked", "stalled", "unknown"].includes(status) ? status : "unknown";
+}
+
+function normalizeProjectionHealth(value, projectionStatus = "unknown") {
+  const health = normalizeStatus(value);
+  if (health === "healthy" && projectionStatus === "caught-up") return "caught-up";
+  if (health === "healthy" && projectionStatus === "projecting") return "projecting";
+  if (["caught-up", "projecting", "degraded", "stalled", "unavailable", "unknown"].includes(health)) return health;
+  return projectionStatus === "caught-up" || projectionStatus === "projecting" ? projectionStatus : "unknown";
+}
+
+function compareFactSessionsDesc(left, right) {
+  return compareTimestampDesc(factUpdatedAt(left), factUpdatedAt(right)) || compareText(factSessionId(left), factSessionId(right));
+}
+
+function compareFactMessagesAsc(left, right) {
+  return compareNumberAsc(factSeq(left), factSeq(right)) || compareTimestampAsc(left?.createdAt ?? left?.updatedAt, right?.createdAt ?? right?.updatedAt) || compareText(left?.messageId, right?.messageId);
+}
+
+function compareFactPartsAsc(left, right) {
+  return compareNumberAsc(left?.partIndex, right?.partIndex) || compareNumberAsc(factSeq(left), factSeq(right)) || compareText(left?.partId, right?.partId);
+}
+
+function compareFactTraceEventsAsc(left, right) {
+  return compareNumberAsc(factSeq(left), factSeq(right)) || compareTimestampAsc(left?.occurredAt ?? left?.createdAt, right?.occurredAt ?? right?.createdAt) || compareText(left?.id, right?.id);
+}
+
+function compareFactRecordsDesc(left, right) {
+  return compareNumberDesc(factSeq(left), factSeq(right)) || compareTimestampDesc(factUpdatedAt(left), factUpdatedAt(right));
+}
+
+function compareTimestampAsc(left, right) {
+  return timestampMs(left) - timestampMs(right);
+}
+
+function compareTimestampDesc(left, right) {
+  return timestampMs(right) - timestampMs(left);
+}
+
+function compareNumberAsc(left, right) {
+  return numericValue(left, Number.MAX_SAFE_INTEGER) - numericValue(right, Number.MAX_SAFE_INTEGER);
+}
+
+function compareNumberDesc(left, right) {
+  return numericValue(right, -1) - numericValue(left, -1);
+}
+
+function compareText(left, right) {
+  return textValue(left).localeCompare(textValue(right));
+}
+
+function timestampMs(value) {
+  const parsed = Date.parse(String(value ?? ""));
+  return Number.isFinite(parsed) ? parsed : 0;
+}
+
+function numericValue(value, fallback) {
+  const parsed = Number(value);
+  return Number.isFinite(parsed) ? parsed : fallback;
+}
+
+function mergeFactSets(...sets) {
+  const merged = emptyFactSet();
+  const keys = {
+    sessions: "sessionId",
+    messages: "messageId",
+    parts: "partId",
+    turns: "turnId",
+    traceEvents: "id",
+    checkpoints: "traceId"
+  };
+  for (const set of sets) {
+    for (const [key, idKey] of Object.entries(keys)) {
+      const seen = new Set(merged[key].map((item) => textValue(item?.[idKey])));
+      for (const item of factArray(set?.[key])) {
+        const id = textValue(item?.[idKey]);
+        if (id && seen.has(id)) continue;
+        merged[key].push(item);
+        if (id) seen.add(id);
+      }
+    }
+  }
+  return merged;
+}
+
+function emptyFactSet() {
+  return {
+    sessions: [],
+    messages: [],
+    parts: [],
+    turns: [],
+    traceEvents: [],
+    checkpoints: []
+  };
+}
+
+function factArray(value) {
+  return Array.isArray(value) ? value : [];
+}
+
 async function handleWorkbenchSessionDetail(response, options, actor, sessionId) {
   const readModel = createWorkbenchReadModel(options, actor);
-  const session = await readModel.getSessionByRouteId(sessionId);
+  const result = await queryFactsByRouteId(readModel, sessionId);
+  if (result.error) return sendJson(response, 503, workbenchProjectionStoreError(result.error));
+  const session = visibleFactSessions(result.facts, actor)[0] ?? null;
   if (!session) return sendJson(response, 404, workbenchError("workbench_session_not_found", "Workbench session is not visible to the current actor.", { sessionId }));
-  const projectionOptions = await sessionProjectionOptions(readModel, session, options);
   sendJson(response, 200, {
     ok: true,
     status: "found",
     contractVersion: "workbench-session-detail-v1",
-    session: sessionDetail(session, projectionOptions),
+    session: factSessionDetail(session, result.facts),
     valuesRedacted: true,
     secretMaterialStored: false
   });
@@ -365,19 +784,21 @@ async function handleWorkbenchSessionDetail(response, options, actor, sessionId)
 
 async function handleWorkbenchMessagePage(response, url, options, actor, sessionId) {
   const readModel = createWorkbenchReadModel(options, actor);
-  const session = await readModel.getSessionByRouteId(sessionId);
+  const result = await queryFactsByRouteId(readModel, sessionId);
+  if (result.error) return sendJson(response, 503, workbenchProjectionStoreError(result.error));
+  const session = visibleFactSessions(result.facts, actor)[0] ?? null;
   if (!session) return sendJson(response, 404, workbenchError("workbench_session_not_found", "Workbench session is not visible to the current actor.", { sessionId }));
-  const projectionOptions = await sessionProjectionOptions(readModel, session, options);
-  const messages = sessionMessages(session, projectionOptions);
+  const messages = factMessagesForSession(session, result.facts);
   const limit = boundedLimit(url.searchParams.get("limit"));
   const offset = cursorOffset(url.searchParams.get("cursor") ?? url.searchParams.get("after"));
   const page = messages.slice(offset, offset + limit);
   const nextOffset = offset + page.length;
+  const resolvedSessionId = factSessionId(session);
   sendJson(response, 200, {
     ok: true,
     status: "succeeded",
     contractVersion: "workbench-message-page-v1",
-    sessionId: session.id,
+    sessionId: resolvedSessionId,
     messages: page,
     count: page.length,
     total: messages.length,
@@ -400,30 +821,24 @@ async function handleWorkbenchTurnSnapshot(response, url, options, actor, rawTur
     return sendJson(response, 400, body);
   }
   const readModel = createWorkbenchReadModel(options, actor);
-  const result = readModel.resultForTrace(traceId);
-  const session = await readModel.getSessionByTraceId(traceId);
-  if (result?.ownerUserId && !readModel.canReadOwner(result.ownerUserId)) {
-    const body = workbenchError("agent_session_owner_required", "Only the session owner or admin can read this Workbench turn.", { traceId });
-    recordWorkbenchTurnReadMetric(options, url, 403, body, startedAt);
-    return sendJson(response, 403, body);
-  }
-  const resultVisible = result && (session || actor.role === "admin" || Boolean(result.ownerUserId));
-  const trace = await readModel.traceSnapshot(traceId);
-  const turnProjection = createWorkbenchTurnProjection({ turnId, traceId, result, session, trace });
-  const status = turnProjection.status;
-  const found = Boolean(resultVisible || session);
+  const result = await readModel.queryFacts({ traceId, limit: MAX_PAGE_LIMIT });
+  if (result.error) return sendJson(response, 503, workbenchProjectionStoreError(result.error));
+  const session = visibleFactSessions(result.facts, actor).find((item) => item.lastTraceId === traceId) ?? visibleFactSessions(result.facts, actor)[0] ?? null;
+  const turn = factTurnForTrace(result.facts, traceId, turnId);
+  const found = Boolean(session || turn);
   if (!found) {
     const body = workbenchError("workbench_turn_not_found", "Workbench turn is not visible to the current actor.", { turnId, traceId });
     recordWorkbenchTurnReadMetric(options, url, 404, body, startedAt);
     return sendJson(response, 404, body);
   }
-  const projection = readModel.projectionDiagnostics({ traceId, result, trace, projection: turnProjection });
-  recordWorkbenchProjectionMetric(options, { result, trace, projection: turnProjection, diagnostic: projection });
+  const projection = factProjectionForTrace(result.facts, traceId);
+  const snapshot = factTurnSnapshot({ turn, session, facts: result.facts, traceId, turnId });
+  const status = snapshot.status;
   const body = {
     ok: true,
     status,
     contractVersion: "workbench-turn-snapshot-v1",
-    turn: turnSnapshot({ projection: turnProjection, result, session, trace }),
+    turn: snapshot,
     projection,
     projectionStatus: projection.projectionStatus,
     projectionHealth: projection.projectionHealth,
@@ -435,6 +850,10 @@ async function handleWorkbenchTurnSnapshot(response, url, options, actor, rawTur
     valuesRedacted: true,
     secretMaterialStored: false
   };
+  recordWorkbenchProjectionMetric(options, {
+    projection: { ...projection, status, eventCount: snapshot.trace?.eventCount ?? projection.lastProjectedSeq ?? 0 },
+    diagnostic: projection
+  });
   recordWorkbenchTurnReadMetric(options, url, 200, body, startedAt);
   sendJson(response, 200, body);
 }
@@ -443,27 +862,21 @@ async function handleWorkbenchTraceEventPage(response, url, options, actor, rawT
   const traceId = safeTraceId(rawTraceId);
   if (!traceId) return sendJson(response, 400, workbenchError("invalid_trace_id", "traceId must start with trc_.", { traceId: rawTraceId }));
   const readModel = createWorkbenchReadModel(options, actor);
-  const result = readModel.resultForTrace(traceId);
-  const session = await readModel.getSessionByTraceId(traceId);
-  if (result?.ownerUserId && !readModel.canReadOwner(result.ownerUserId)) {
-    return sendJson(response, 403, workbenchError("agent_session_owner_required", "Only the session owner or admin can read this Workbench trace.", { traceId }));
-  }
-  const resultVisible = result && (session || actor.role === "admin" || Boolean(result.ownerUserId));
-  if (!resultVisible && !session) {
+  const result = await readModel.queryFacts({ traceId, limit: MAX_PAGE_LIMIT });
+  if (result.error) return sendJson(response, 503, workbenchProjectionStoreError(result.error));
+  const session = visibleFactSessions(result.facts, actor).find((item) => item.lastTraceId === traceId) ?? visibleFactSessions(result.facts, actor)[0] ?? null;
+  if (!session && result.facts.traceEvents.length === 0) {
     return sendJson(response, 404, workbenchError("workbench_trace_not_found", "Workbench trace is not visible to the current actor.", { traceId }));
   }
-  const trace = await readModel.traceSnapshot(traceId);
-  const page = traceEventPage(trace, tracePageOptions(url));
-  const turnProjection = createWorkbenchTurnProjection({ traceId, result, session, trace });
-  const projection = readModel.projectionDiagnostics({ traceId, result, trace, projection: turnProjection });
-  recordWorkbenchProjectionMetric(options, { result, trace, projection: turnProjection, diagnostic: projection });
+  const page = traceEventPage(factTraceSnapshot(result.facts, traceId), tracePageOptions(url));
+  const projection = factProjectionForTrace(result.facts, traceId);
   sendJson(response, 200, {
     ok: true,
     status: "succeeded",
     contractVersion: "workbench-trace-events-v1",
     traceId,
-    sessionId: safeSessionId(result?.sessionId ?? result?.session?.sessionId ?? session?.id) ?? null,
-    threadId: safeOpaqueId(result?.threadId ?? result?.session?.threadId ?? session?.threadId) ?? (textValue(session?.threadId) || null),
+    sessionId: factSessionId(session),
+    threadId: safeOpaqueId(session?.threadId) ?? (textValue(session?.threadId) || null),
     ...page,
     projection,
     projectionStatus: projection.projectionStatus,
diff --git a/internal/cloud/workbench-facts-store.ts b/internal/cloud/workbench-facts-store.ts
index 9f029d6d..7e26aa0e 100644
--- a/internal/cloud/workbench-facts-store.ts
+++ b/internal/cloud/workbench-facts-store.ts
@@ -16,6 +16,34 @@ export function createWorkbenchFactsStore(options = {}, actor = null) {
   const runtimeStore = options.runtimeStore ?? null;
   const results = options.codeAgentChatResults ?? null;
 
+  async function queryFacts(params = {}) {
+    if (typeof runtimeStore?.queryWorkbenchFacts === "function") {
+      try {
+        const result = await runtimeStore.queryWorkbenchFacts(params);
+        return {
+          facts: normalizeWorkbenchFactsResult(result?.facts),
+          count: Number.isFinite(Number(result?.count)) ? Number(result.count) : 0,
+          durable: true,
+          persistence: result?.persistence ?? null
+        };
+      } catch (error) {
+        return {
+          facts: emptyWorkbenchFacts(),
+          count: 0,
+          durable: true,
+          error,
+          projection: projectionStoreUnavailableTrace(safeTraceId(params.traceId) ?? "trc_unassigned", error)
+        };
+      }
+    }
+    return {
+      facts: emptyWorkbenchFacts(),
+      count: 0,
+      durable: false,
+      persistence: null
+    };
+  }
+
   async function getSessionById(sessionId) {
     const safeId = safeSessionId(sessionId);
     if (!safeId) return null;
@@ -96,6 +124,7 @@ export function createWorkbenchFactsStore(options = {}, actor = null) {
   }
 
   return {
+    queryFacts,
     getSessionById,
     getSessionByRouteId,
     getSessionByTraceId,
@@ -250,3 +279,22 @@ function normalizeStatus(value) {
   if (text === "cancelled") return "canceled";
   return text || "unknown";
 }
+
+function normalizeWorkbenchFactsResult(facts = {}) {
+  const normalized = emptyWorkbenchFacts();
+  for (const key of Object.keys(normalized)) {
+    normalized[key] = Array.isArray(facts?.[key]) ? facts[key].map((item) => ({ ...item })) : [];
+  }
+  return normalized;
+}
+
+function emptyWorkbenchFacts() {
+  return {
+    sessions: [],
+    messages: [],
+    parts: [],
+    turns: [],
+    traceEvents: [],
+    checkpoints: []
+  };
+}
diff --git a/internal/cloud/workbench-read-model.ts b/internal/cloud/workbench-read-model.ts
index 7219bdc3..9fc1db8f 100644
--- a/internal/cloud/workbench-read-model.ts
+++ b/internal/cloud/workbench-read-model.ts
@@ -9,6 +9,7 @@ export function createWorkbenchReadModel(options = {}, actor = null) {
   const facts = createWorkbenchFactsStore(options, actor);
   return {
     facts,
+    queryFacts: (input = {}) => facts.queryFacts(input),
     listSessions: (input = {}) => facts.listSessions(input),
     getSessionById: (sessionId) => facts.getSessionById(sessionId),
     getSessionByRouteId: (routeId) => facts.getSessionByRouteId(routeId),
diff --git a/internal/db/runtime-store.ts b/internal/db/runtime-store.ts
index 01bc92a0..26d66788 100644
--- a/internal/db/runtime-store.ts
+++ b/internal/db/runtime-store.ts
@@ -604,7 +604,7 @@ export class CloudRuntimeStore {
   }
 
   queryWorkbenchFacts(params = {}) {
-    const sessions = [...this.workbenchSessions.values()].filter((record) => matchesQuery(record, params, ["sessionId", "ownerUserId", "projectId", "conversationId", "threadId", "status"]));
+    const sessions = [...this.workbenchSessions.values()].filter((record) => matchesWorkbenchSessionFactQuery(record, params));
     const messages = [...this.workbenchMessages.values()].filter((record) => matchesQuery(record, params, ["messageId", "sessionId", "turnId", "traceId", "role", "status"]));
     const parts = [...this.workbenchParts.values()].filter((record) => matchesQuery(record, params, ["partId", "messageId", "sessionId", "turnId", "traceId", "partType", "status"]));
     const turns = [...this.workbenchTurns.values()].filter((record) => matchesQuery(record, params, ["turnId", "sessionId", "traceId", "messageId", "status"]));
@@ -1213,7 +1213,7 @@ export class PostgresCloudRuntimeStore {
   async queryWorkbenchFacts(params = {}) {
     await this.assertReadyForDurableReads("workbench.facts.query");
     const facts = {
-      sessions: await this.queryWorkbenchFactRows("workbench.sessions.query", "workbench_sessions", "session_json", params, { sessionId: "session_id", ownerUserId: "owner_user_id", projectId: "project_id", conversationId: "conversation_id", threadId: "thread_id", status: "status" }),
+      sessions: await this.queryWorkbenchFactRows("workbench.sessions.query", "workbench_sessions", "session_json", params, { sessionId: "session_id", ownerUserId: "owner_user_id", projectId: "project_id", conversationId: "conversation_id", threadId: "thread_id", traceId: "last_trace_id", lastTraceId: "last_trace_id", status: "status" }),
       messages: await this.queryWorkbenchFactRows("workbench.messages.query", "workbench_messages", "message_json", params, { messageId: "message_id", sessionId: "session_id", turnId: "turn_id", traceId: "trace_id", role: "role", status: "status" }),
       parts: await this.queryWorkbenchFactRows("workbench.parts.query", "workbench_parts", "part_json", params, { partId: "part_id", messageId: "message_id", sessionId: "session_id", turnId: "turn_id", traceId: "trace_id", partType: "part_type", status: "status" }),
       turns: await this.queryWorkbenchFactRows("workbench.turns.query", "workbench_turns", "turn_json", params, { turnId: "turn_id", sessionId: "session_id", traceId: "trace_id", messageId: "message_id", status: "status" }),
@@ -2166,6 +2166,13 @@ function matchesQuery(record, params, fields) {
   return true;
 }
 
+function matchesWorkbenchSessionFactQuery(record, params) {
+  if (!matchesQuery(record, params, ["sessionId", "ownerUserId", "projectId", "conversationId", "threadId", "status"])) return false;
+  const traceId = textOr(params.traceId ?? params.lastTraceId, "");
+  if (traceId && record.lastTraceId !== traceId && record.traceId !== traceId) return false;
+  return true;
+}
+
 function limitResults(records, limit) {
   const parsed = Number.parseInt(limit ?? "", 10);
   if (!Number.isInteger(parsed) || parsed <= 0) {