diff --git a/internal/cloud/access-control.ts b/internal/cloud/access-control.ts
index a7ac3839..8d0fc6b2 100644
--- a/internal/cloud/access-control.ts
+++ b/internal/cloud/access-control.ts
@@ -1177,12 +1177,15 @@ class MemoryAccessStore {
   async archiveAgentConversation(input = {}) {
     const ownerUserId = textOr(input.ownerUserId, "");
     const role = textOr(input.actorRole, "user");
+    const sessionId = textOr(input.sessionId, "");
     const conversationId = textOr(input.conversationId, "");
     const projectId = textOr(input.projectId, "");
     const now = input.now ?? this.now();
+    if (!sessionId && !conversationId) return { count: 0 };
     let count = 0;
     for (const [id, session] of this.agentSessions.entries()) {
       if ((input.ownerScoped === true || role !== "admin") && session.ownerUserId !== ownerUserId) continue;
+      if (sessionId && id !== sessionId) continue;
       if (conversationId && session.conversationId !== conversationId) continue;
       if (projectId && session.projectId !== projectId) continue;
       this.agentSessions.set(id, { ...session, status: "archived", endedAt: session.endedAt ?? now, updatedAt: now });
@@ -1345,11 +1348,21 @@ class PostgresAccessStore extends MemoryAccessStore {
     await this.ensureSchema();
     const role = textOr(input.actorRole, "user");
     const ownerUserId = textOr(input.ownerUserId, "");
+    const sessionId = textOr(input.sessionId, "");
     const conversationId = textOr(input.conversationId, "");
     const projectId = textOr(input.projectId, "");
     const now = input.now ?? this.now();
-    const clauses = ["conversation_id = $1"];
-    const params = [conversationId];
+    if (!sessionId && !conversationId) return { count: 0 };
+    const clauses = [];
+    const params = [];
+    if (sessionId) {
+      params.push(sessionId);
+      clauses.push(`id = $${params.length}`);
+    }
+    if (conversationId) {
+      params.push(conversationId);
+      clauses.push(`conversation_id = $${params.length}`);
+    }
     if (input.ownerScoped === true || role !== "admin") {
       params.push(ownerUserId);
       clauses.push(`owner_user_id = $${params.length}`);
diff --git a/internal/cloud/server-code-agent-http.ts b/internal/cloud/server-code-agent-http.ts
index 24ab54a4..4e0c6f17 100644
--- a/internal/cloud/server-code-agent-http.ts
+++ b/internal/cloud/server-code-agent-http.ts
@@ -162,6 +162,10 @@ export async function handleCodeAgentSessionsHttp(request, response, url, option
     await getManualCodeAgentSession(response, options, sessionId);
     return;
   }
+  if (request.method === "DELETE" && sessionId && !action) {
+    await archiveManualCodeAgentSession(response, options, sessionId);
+    return;
+  }
   if (request.method === "POST" && sessionId && action === "select") {
     await selectManualCodeAgentSession(request, response, options, sessionId);
     return;
@@ -249,6 +253,31 @@ async function getManualCodeAgentSession(response, options, sessionId) {
   });
 }
 
+async function archiveManualCodeAgentSession(response, options, sessionId) {
+  const session = await getVisibleManualAgentSession(options, sessionId);
+  if (!session) {
+    sendJson(response, 404, manualSessionErrorPayload({ code: "session_not_found", message: "Code Agent session is not visible to the current actor.", sessionId }));
+    return;
+  }
+  const result = await options.accessController?.store?.archiveAgentConversation?.({
+    ownerUserId: options.actor?.id,
+    actorRole: options.actor?.role,
+    ownerScoped: true,
+    sessionId,
+    conversationId: session.conversationId,
+    projectId: session.projectId
+  }) ?? { count: 0 };
+  sendJson(response, 200, {
+    ok: true,
+    status: "archived",
+    contractVersion: "code-agent-manual-session-v1",
+    archivedCount: result.count ?? 0,
+    session: publicManualAgentSession({ ...session, status: "archived", endedAt: session.endedAt ?? new Date().toISOString(), updatedAt: new Date().toISOString() }),
+    valuesRedacted: true,
+    secretMaterialStored: false
+  });
+}
+
 async function selectManualCodeAgentSession(request, response, options, sessionId) {
   const body = await readJsonObjectBody(request, options.bodyLimitBytes);
   if (!body.ok) {
diff --git a/internal/cloud/server-workbench-http.ts b/internal/cloud/server-workbench-http.ts
index 53937aa8..636913cf 100644
--- a/internal/cloud/server-workbench-http.ts
+++ b/internal/cloud/server-workbench-http.ts
@@ -7,6 +7,7 @@ import { createHash } from "node:crypto";
 import { defaultCodeAgentTraceStore } from "./code-agent-trace-store.ts";
 import {
   parsePositiveInteger,
+  safeConversationId,
   safeOpaqueId,
   safeSessionId,
   safeTraceId,
@@ -200,6 +201,7 @@ async function handleWorkbenchSessionList(response, url, options, actor) {
   if (url.searchParams.has("projectId") || url.searchParams.has("workspaceId")) return sendJson(response, 400, workbenchError("workbench_authority_removed", "Workbench session list is keyed by sessionId only."));
   const limit = boundedLimit(url.searchParams.get("limit"));
   const includeSessionId = safeSessionId(url.searchParams.get("includeSessionId"));
+  const includeRouteId = includeSessionId ?? safeConversationId(url.searchParams.get("includeSessionId"));
   const store = options.accessController?.store;
   const listInput = {
     ownerUserId: actor.id,
@@ -209,8 +211,8 @@ async function handleWorkbenchSessionList(response, url, options, actor) {
     includeArchived: false
   };
   let sessions = await store?.listAgentSessionsForUser?.(listInput) ?? [];
-  if (includeSessionId && !sessions.some((session) => session.id === includeSessionId)) {
-    const included = await visibleSessionById(store, includeSessionId, actor);
+  if (includeRouteId && !sessions.some((session) => session.id === includeSessionId)) {
+    const included = await visibleSessionByRouteId(store, includeRouteId, actor);
     if (included) sessions = [included, ...sessions];
   }
   const summaries = sessions.map((session) => sessionSummary(session, options)).filter(Boolean);
@@ -227,7 +229,7 @@ async function handleWorkbenchSessionList(response, url, options, actor) {
 }
 
 async function handleWorkbenchSessionDetail(response, options, actor, sessionId) {
-  const session = await visibleSessionById(options.accessController?.store, sessionId, actor);
+  const session = await visibleSessionByRouteId(options.accessController?.store, sessionId, actor);
   if (!session) return sendJson(response, 404, workbenchError("workbench_session_not_found", "Workbench session is not visible to the current actor.", { sessionId }));
   sendJson(response, 200, {
     ok: true,
@@ -240,7 +242,7 @@ async function handleWorkbenchSessionDetail(response, options, actor, sessionId)
 }
 
 async function handleWorkbenchMessagePage(response, url, options, actor, sessionId) {
-  const session = await visibleSessionById(options.accessController?.store, sessionId, actor);
+  const session = await visibleSessionByRouteId(options.accessController?.store, sessionId, actor);
   if (!session) return sendJson(response, 404, workbenchError("workbench_session_not_found", "Workbench session is not visible to the current actor.", { sessionId }));
   const messages = sessionMessages(session);
   const limit = boundedLimit(url.searchParams.get("limit"));
@@ -320,6 +322,19 @@ async function visibleSessionById(store, sessionId, actor) {
   return canActorReadSession(session, actor) ? session : null;
 }
 
+async function visibleSessionByRouteId(store, routeId, actor) {
+  const sessionId = safeSessionId(routeId);
+  if (sessionId) return visibleSessionById(store, sessionId, actor);
+  const conversationId = safeConversationId(routeId);
+  if (!conversationId) return null;
+  const listed = await store?.listAgentSessionsForUser?.({ ownerUserId: actor.id, actorRole: actor.role, ownerScoped: true, conversationId, limit: 1, includeArchived: false }) ?? [];
+  const matched = listed.find((session) => canActorReadSession(session, actor)) ?? null;
+  if (matched) return matched;
+  const suffix = conversationId.slice("cnv_".length);
+  const deterministicSessionId = safeSessionId(`ses_${suffix}`);
+  return deterministicSessionId ? visibleSessionById(store, deterministicSessionId, actor) : null;
+}
+
 async function visibleSessionByTrace(store, traceId, actor) {
   const safeId = safeTraceId(traceId);
   if (!safeId) return null;
@@ -333,7 +348,7 @@ function sessionSummary(session, options) {
   const traceId = safeTraceId(session.lastTraceId ?? snapshot.lastTraceId ?? snapshot.currentTraceId) ?? null;
   const trace = traceId ? traceSnapshotSync(options, traceId) : null;
   const messages = sessionMessages(session);
-  const status = normalizeStatus(snapshot.sessionStatus ?? session.status ?? trace?.status);
+  const status = canonicalWorkbenchStatus(snapshot.sessionStatus ?? session.status, trace?.status);
   return {
     sessionId: session.id,
     threadId: safeOpaqueId(session.threadId) ?? (textValue(session.threadId) || null),
@@ -613,18 +628,24 @@ function traceSnapshotLastSeq(snapshot) {
 }
 
 function turnStatus(result, session, trace) {
-  return normalizeStatus(
+  return canonicalWorkbenchStatus(
     result?.status ??
     result?.agentRun?.terminalStatus ??
     result?.agentRun?.commandState ??
     result?.agentRun?.status ??
     session?.status ??
-    objectValue(session?.session).sessionStatus ??
-    trace?.status ??
-    "unknown"
+    objectValue(session?.session).sessionStatus,
+    trace?.status
   );
 }
 
+function canonicalWorkbenchStatus(primary, traceStatus) {
+  const primaryStatus = normalizeStatus(primary);
+  const trace = normalizeStatus(traceStatus);
+  if (TERMINAL_STATUSES.has(trace) && (!TERMINAL_STATUSES.has(primaryStatus) || RUNNING_STATUSES.has(primaryStatus))) return trace;
+  return primaryStatus || trace || "unknown";
+}
+
 function canActorReadSession(session, actor) {
   if (!session || !actor) return false;
   if (normalizeStatus(session.status) === "archived") return false;
diff --git a/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts b/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
index 04acc6f9..d7bd0e81 100644
--- a/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
+++ b/web/hwlab-cloud-web/scripts/workbench-e2e-server.ts
@@ -101,14 +101,14 @@ async function handleRequest(request: IncomingMessage, response: ServerResponse)
 
   const sessionMessagesMatch = path.match(/^\/v1\/workbench\/sessions\/([^/]+)\/messages$/u);
   if (sessionMessagesMatch && method === "GET") {
-    const sessionId = decodeURIComponent(sessionMessagesMatch[1] ?? "");
+    const sessionId = canonicalSessionId(decodeURIComponent(sessionMessagesMatch[1] ?? ""));
     const session = visibleSessionById(sessionId);
     return session ? json(response, 200, workbenchSessionMessagesPayload(session, url)) : json(response, 404, { ok: false, status: 404, error: { code: "session_not_found" } });
   }
 
   const workbenchSessionMatch = path.match(/^\/v1\/workbench\/sessions\/([^/]+)$/u);
   if (workbenchSessionMatch && method === "GET") {
-    const sessionId = decodeURIComponent(workbenchSessionMatch[1] ?? "");
+    const sessionId = canonicalSessionId(decodeURIComponent(workbenchSessionMatch[1] ?? ""));
     if (state.scenarioId === "session-switch-detail-404-isolated" && sessionId === "ses_stale_404") return json(response, 404, { ok: false, status: 404, error: { code: "session_not_found" } });
     if (state.scenarioId === "completed-replay-detail-404" && sessionId === "ses_completed") return json(response, 404, { ok: false, status: 404, error: { code: "session_replay_unavailable" } });
     const session = visibleSessionById(sessionId, { includeArchived: true });
@@ -130,6 +130,13 @@ async function handleRequest(request: IncomingMessage, response: ServerResponse)
   }
 
   const agentSessionMatch = path.match(/^\/v1\/agent\/sessions\/([^/]+)$/u);
+  if (agentSessionMatch && method === "DELETE") {
+    const session = sessionById(decodeURIComponent(agentSessionMatch[1] ?? ""));
+    if (!session) return json(response, 404, { ok: false, status: 404, error: { code: "session_not_found" } });
+    session.status = "archived";
+    session.updatedAt = new Date().toISOString();
+    return json(response, 200, { ok: true, status: "archived", session, archivedCount: 1 });
+  }
   if (agentSessionMatch && method === "GET") return json(response, 200, { session: sessionPayload(decodeURIComponent(agentSessionMatch[1] ?? "")) });
 
   if (path === "/v1/provider-profiles") return json(response, 200, { profiles: [{ profile: "codex-api", name: "Codex API", configured: true }, { profile: "deepseek", name: "DeepSeek", configured: true }] });
@@ -148,6 +155,13 @@ function createScenarioState(scenarioId: string): ScenarioState {
   const sessions = base.sessions;
   const traces = base.traces;
   if (id === "cross-project-detail-boundary") sessions.push(hiddenBoundarySession());
+  if (id === "legacy-cnv-deeplink-canonical") {
+    sessions.unshift(legacyCanonicalSession());
+    traces.trc_40badc15523146c9 = legacyCanonicalTrace();
+  }
+  if (id === "session-rail-many") {
+    for (let index = 0; index < 46; index += 1) sessions.push(manyRailSession(index));
+  }
   if (id === "session-switch-detail-404-isolated") {
     sessions.unshift(staleDetailSession());
     sessions.push(emptySession());
@@ -160,6 +174,8 @@ function createScenarioState(scenarioId: string): ScenarioState {
   if (id === "session-switch-empty-reload") sessions.push(emptySession());
   const selectedSessionId = id === "deep-link" || id === "stale-nested-trace"
     ? "ses_failed"
+    : id === "legacy-cnv-deeplink-canonical"
+      ? "ses_running"
     : id === "session-switch-detail-404-isolated" || id === "completed-replay-detail-404" || id === "deleted-session-deeplink" || id === "terminal-turn-stale-session-active"
       ? "ses_completed"
       : id === "terminal-empty-trace"
@@ -218,6 +234,45 @@ function terminalEmptyTrace(): JsonRecord {
   return { traceId: "trc_terminal_empty", status: "completed", sessionId: "ses_terminal_empty", threadId: "thr_terminal_empty", events: [], eventCount: 0, fullTraceLoaded: true, hasMore: false, finalResponse: { text: "终态空 Trace 已完成。" } };
 }
 
+function legacyCanonicalSession(): SessionRecord {
+  const now = new Date().toISOString();
+  return {
+    sessionId: "ses_c5e1330558c94d8e",
+    conversationId: "cnv_c5e1330558c94d8e",
+    threadId: "thr_c5e1330558c94d8e",
+    status: "completed",
+    lastTraceId: "trc_40badc15523146c9",
+    startedAt: now,
+    updatedAt: now,
+    messageCount: 2,
+    firstUserMessagePreview: "legacy cnv deep link canonical smoke",
+    messages: [
+      { id: "msg_c5_user", role: "user", title: "用户", text: "legacy cnv deep link canonical smoke", status: "sent", createdAt: now, sessionId: "ses_c5e1330558c94d8e", threadId: "thr_c5e1330558c94d8e", traceId: "trc_40badc15523146c9" },
+      { id: "msg_c5_agent", role: "agent", title: "Code Agent", text: "已完成：新增 Python benchmark 脚本。", status: "completed", createdAt: now, sessionId: "ses_c5e1330558c94d8e", threadId: "thr_c5e1330558c94d8e", traceId: "trc_40badc15523146c9", runnerTrace: legacyCanonicalTrace() }
+    ]
+  };
+}
+
+function legacyCanonicalTrace(): JsonRecord {
+  return {
+    traceId: "trc_40badc15523146c9",
+    status: "completed",
+    sessionId: "ses_c5e1330558c94d8e",
+    threadId: "thr_c5e1330558c94d8e",
+    events: [{ seq: 1, label: "agentrun:assistant:message", type: "assistant_message", status: "completed", terminal: true, final: true, message: "已完成：新增 Python benchmark 脚本。" }],
+    eventCount: 1,
+    fullTraceLoaded: true,
+    hasMore: false,
+    finalResponse: { text: "已完成：新增 Python benchmark 脚本。", status: "completed" }
+  };
+}
+
+function manyRailSession(index: number): SessionRecord {
+  const id = String(index).padStart(2, "0");
+  const now = new Date(Date.now() - (index + 1) * 1000).toISOString();
+  return { sessionId: `ses_many_${id}`, threadId: `thr_many_${id}`, status: "completed", lastTraceId: `trc_many_${id}`, startedAt: now, updatedAt: now, messageCount: 0, firstUserMessagePreview: `历史 session ${id}`, messages: [] };
+}
+
 function staleDetailSession(): SessionRecord {
   const now = new Date().toISOString();
   return { sessionId: "ses_stale_404", threadId: "thr_stale_404", status: "active", startedAt: now, updatedAt: now, messageCount: 0, firstUserMessagePreview: "已失效的列表项", messages: [] };
@@ -281,6 +336,13 @@ function sessionById(id: string): SessionRecord | null {
   return state.sessions.find((session) => session.sessionId === id) ?? null;
 }
 
+function canonicalSessionId(id: string): string {
+  const text = id.trim();
+  if (!text.startsWith("cnv_")) return text;
+  const conversation = state.sessions.find((session) => session.conversationId === text);
+  return conversation?.sessionId ?? `ses_${text.slice("cnv_".length)}`;
+}
+
 function visibleSessionById(id: string, options: { includeArchived?: boolean } = {}): SessionRecord | null {
   const session = sessionById(id);
   if (!session || session.hidden) return null;
@@ -296,6 +358,7 @@ function sessionPayload(sessionId: string): JsonRecord {
 
 function turnPayload(traceId: string): JsonRecord {
   const trace = state.traces[traceId] ?? { traceId, status: "unknown", events: [] };
+  if (state.scenarioId === "terminal-turn-stale-session-active" && traceId === "trc_completed") return { ...trace, traceId, status: "active", running: true, terminal: false, trace: { status: "completed", eventCount: trace.eventCount ?? 0 } };
   const status = String(trace.status ?? "unknown");
   return { ...trace, traceId, status, running: ["running", "pending", "accepted"].includes(status), terminal: ["completed", "failed", "blocked", "timeout", "canceled"].includes(status) };
 }
diff --git a/web/hwlab-cloud-web/src/api/agent.ts b/web/hwlab-cloud-web/src/api/agent.ts
index 47fa6c3a..510e12a0 100644
--- a/web/hwlab-cloud-web/src/api/agent.ts
+++ b/web/hwlab-cloud-web/src/api/agent.ts
@@ -24,20 +24,24 @@ export const agentAPI = {
   getAgentTrace: async (traceId: string, timeoutMs = 8000, activityRef?: ApiRequestOptions["activityRef"], options?: AgentTraceRequestOptions): Promise<ApiResult<AgentChatResultResponse>> => normalizeWorkbenchTraceResult(await fetchJson<Record<string, unknown>>(workbenchTracePath(traceId, options), { timeoutMs, timeoutName: "Code Agent trace", activityRef }), traceId),
   createAgentSession: (payload: Record<string, unknown> = {}): Promise<ApiResult<{ session?: Record<string, unknown> }>> => fetchJson("/v1/agent/sessions", { method: "POST", body: JSON.stringify(payload), timeoutMs: 30000, timeoutName: "Code Agent session create" }),
   getAgentSession: (sessionId: string): Promise<ApiResult<{ session?: Record<string, unknown> }>> => fetchJson(`/v1/agent/sessions/${encodeURIComponent(sessionId)}`, { timeoutMs: 8000, timeoutName: "Code Agent session" }),
+  deleteAgentSession: (sessionId: string): Promise<ApiResult<{ ok?: boolean; status?: string; session?: Record<string, unknown>; archivedCount?: number }>> => fetchJson(`/v1/agent/sessions/${encodeURIComponent(sessionId)}`, { method: "DELETE", timeoutMs: 30000, timeoutName: "Code Agent session delete" }),
   cancelAgentMessage: (payload: Record<string, unknown>): Promise<ApiResult<{ ok?: boolean; canceled?: boolean; error?: { code?: string; message?: string; userMessage?: string } }>> => fetchJson("/v1/agent/chat/cancel", { method: "POST", body: JSON.stringify(payload), timeoutMs: 30000, timeoutName: "Code Agent cancel" })
 };
 
 function normalizeWorkbenchTurnResult(result: ApiResult<Record<string, unknown>>, traceId: string): ApiResult<AgentChatResultResponse> {
   if (!result.ok || !result.data) return result as ApiResult<AgentChatResultResponse>;
   const turn = recordValue(result.data.turn) ?? result.data;
+  const trace = recordValue(turn.trace);
+  const status = canonicalWorkbenchStatus(textValue(turn.status) ?? textValue(result.data.status) ?? "unknown", textValue(trace?.status, result.data.traceStatus));
+  const terminal = turn.terminal === true || isTerminalStatus(status);
   return {
     ...result,
     data: {
       ...turn,
       traceId: textValue(turn.traceId) ?? traceId,
-      status: textValue(turn.status) ?? textValue(result.data.status) ?? "unknown",
-      running: turn.running === true,
-      terminal: turn.terminal === true,
+      status,
+      running: !terminal && (turn.running === true || isActiveStatus(status)),
+      terminal,
       sessionId: textValue(turn.sessionId) ?? undefined,
       threadId: textValue(turn.threadId) ?? undefined,
       agentRun: recordValue(turn.agentRun) ?? undefined,
@@ -46,6 +50,28 @@ function normalizeWorkbenchTurnResult(result: ApiResult<Record<string, unknown>>
   };
 }
 
+function canonicalWorkbenchStatus(primary: string | null, traceStatus: string | null): string {
+  const primaryStatus = normalizeStatus(primary);
+  const trace = normalizeStatus(traceStatus);
+  if (trace && isTerminalStatus(trace) && (!primaryStatus || isActiveStatus(primaryStatus) || !isTerminalStatus(primaryStatus))) return trace;
+  return primaryStatus ?? trace ?? "unknown";
+}
+
+function normalizeStatus(value: unknown): string | null {
+  const text = textValue(value);
+  if (!text) return null;
+  const normalized = text.toLowerCase().replace(/_/gu, "-");
+  return normalized === "cancelled" ? "canceled" : normalized;
+}
+
+function isActiveStatus(value: unknown): boolean {
+  return ["accepted", "active", "busy", "creating", "pending", "processing", "running"].includes(normalizeStatus(value) ?? "");
+}
+
+function isTerminalStatus(value: unknown): boolean {
+  return ["blocked", "canceled", "completed", "failed", "stale", "thread-resume-failed", "timeout"].includes(normalizeStatus(value) ?? "");
+}
+
 function normalizeWorkbenchTraceResult(result: ApiResult<Record<string, unknown>>, traceId: string): ApiResult<AgentChatResultResponse> {
   if (!result.ok || !result.data) return result as ApiResult<AgentChatResultResponse>;
   const events = Array.isArray(result.data.events) ? result.data.events : [];
diff --git a/web/hwlab-cloud-web/src/stores/workbench-session.ts b/web/hwlab-cloud-web/src/stores/workbench-session.ts
index 36b586be..a04f3e87 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-session.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-session.ts
@@ -243,8 +243,10 @@ function latestAgentMessage(messages: ChatMessage[] | undefined): ChatMessage |
 function resolveSessionTabStatus(session: WorkbenchSessionRecord, authority: SessionStatusAuthority | null | undefined): string {
   const authorityStatus = normalizeSessionStatus(authority?.status);
   const terminalStatus = terminalStatusFromSession(session);
+  const sessionStatus = normalizeSessionStatus(session.status);
   if (authorityStatus && isActiveStatus(authorityStatus) && terminalStatus) return terminalStatus;
-  return authorityStatus ?? terminalStatus ?? "unknown";
+  if (sessionStatus && isActiveStatus(sessionStatus) && terminalStatus) return terminalStatus;
+  return authorityStatus ?? terminalStatus ?? sessionStatus ?? "unknown";
 }
 
 function terminalStatusFromSession(session: WorkbenchSessionRecord): string | null {
diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index bf2cebc9..c7e6c9e8 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -7,7 +7,7 @@ import { api } from "@/api";
 import { connectWorkbenchEvents, type WorkbenchEventStream, type WorkbenchRealtimeEvent } from "@/api/workbench-events";
 import { assistantTextFromTraceEvents, mergeRunnerTrace, snapshotToRunnerTrace, type TraceSnapshot } from "@/composables/useTraceSubscription";
 import type { AgentChatResponse, AgentChatResultResponse, AgentRunProvenance, ApiResult, ChatMessage, LiveSurface, ProviderProfile, TraceEvent, WorkbenchSessionRecord } from "@/types";
-import { firstNonEmptyString, nextProtocolId, normalizeWorkbenchSessionId } from "@/utils";
+import { firstNonEmptyString, nextProtocolId, normalizeWorkbenchSessionId, normalizeWorkbenchSessionRouteId } from "@/utils";
 import { failWorkbenchSessionSwitch, failWorkbenchSubmitJourney, finishWorkbenchSessionSwitchFullLoad, markWorkbenchSubmitApiAccepted, markWorkbenchTraceEventsReceived, markWorkbenchTraceProjected, startWorkbenchSessionSwitch, startWorkbenchSubmitJourney } from "@/utils/workbench-performance";
 import { RECENT_DRAFTS_STORAGE_KEY, defaultProviderProfileOptions, isArchivedSession, mergeSessionIntoList, normalizeChatMessageStatus, normalizeRecentDrafts, normalizeWorkbenchMessageTitle, providerProfileOptionsFromPayload, recordRecentDraft, resolveCancelableAgentMessage, resolveComposerState, shouldShowSessionListLoading, sortSessionTabs, stableSessionList, type DraftEntry, type ProviderProfileOption, type TurnStatusAuthority } from "./workbench-session";
 import { initialWorkbenchSessionIdFromLocation } from "./workbench-projection";
@@ -69,6 +69,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   async function hydrate(options: HydrateOptions = {}): Promise<void> {
+    const routeRequestId = normalizeWorkbenchSessionRouteId(options.sessionId);
     const routeSessionId = normalizeWorkbenchSessionId(options.sessionId);
     if (routeSessionId) setActiveSessionSelection(routeSessionId);
     const requestEpoch = beginSessionSelection();
@@ -83,16 +84,17 @@ export const useWorkbenchStore = defineStore("workbench", () => {
       return;
     }
     const listedSessions = workbenchSessionsFromPayload(sessionsResult.data);
-    const targetSessionId = routeSessionId ?? includeSessionId ?? activeSessionId.value ?? listedSessions[0]?.sessionId ?? null;
-    if (targetSessionId) {
+    const targetSessionId = routeRequestId ?? includeSessionId ?? activeSessionId.value ?? listedSessions[0]?.sessionId ?? null;
+    if (targetSessionId && (routeSessionId || !routeRequestId)) {
       setActiveSessionSelection(targetSessionId);
-      sessionDetailLoadingId.value = targetSessionId;
     }
+    if (targetSessionId) sessionDetailLoadingId.value = targetSessionId;
     const selected = targetSessionId ? await loadWorkbenchSession(targetSessionId, listedSessions.find((item) => item.sessionId === targetSessionId) ?? null) : null;
     clearSessionDetailLoading(targetSessionId);
     if (selected && isCurrentSessionSelection(requestEpoch, selected.sessionId)) applySelectedSessionDetail(selected, messages.value);
-    if (options.invalidRouteId || (targetSessionId && !selected)) error.value = "invalid session URL";
-    const nextSessions = stableSessionList(sessions.value, listedSessions, targetSessionId, selected);
+    if (selected && routeRequestId && !isCurrentSessionSelection(requestEpoch, selected.sessionId)) applySelectedSessionDetail(selected, messages.value);
+    if (options.invalidRouteId || (targetSessionId && !selected)) isolateSessionLoadFailure(targetSessionId ?? options.invalidRouteId ?? "invalid-session", null, [], "invalid session URL", { restorePrevious: false });
+    const nextSessions = stableSessionList(sessions.value, listedSessions, selected?.sessionId ?? routeSessionId ?? includeSessionId, selected);
     sessions.value = nextSessions;
     rememberSessionList(nextSessions);
     sessionsReady.value = true;
@@ -128,6 +130,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     sessions.value = mergeSessionIntoList(sessions.value, created);
     rememberSessionDetail(created);
     sessionsReady.value = true;
+    setActiveSessionSelection(created.sessionId);
     await selectSession(created);
   }
 
@@ -136,8 +139,9 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   async function selectSessionById(sessionId: string, seed: WorkbenchSessionRecord | null = null): Promise<boolean> {
+    const requestId = normalizeWorkbenchSessionRouteId(sessionId);
     const normalized = normalizeWorkbenchSessionId(sessionId);
-    if (!normalized) {
+    if (!requestId) {
       error.value = "invalid session URL";
       return false;
     }
@@ -145,39 +149,44 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     const previousMessages = messages.value;
     const existing = seed ?? sessions.value.find((session) => session.sessionId === normalized) ?? null;
     const requestEpoch = beginSessionSelection();
-    startWorkbenchSessionSwitch({ sessionId: normalized, source: existing ? "rail" : "deeplink", targetState: existing?.status ?? "unknown", cache: (existing?.messages?.length ?? 0) > 0 ? "warm" : "cold" });
-    switchingSessionId.value = normalized;
-    setActiveSessionSelection(normalized);
-    sessionDetailLoadingId.value = normalized;
+    startWorkbenchSessionSwitch({ sessionId: normalized ?? requestId, source: existing ? "rail" : "deeplink", targetState: existing?.status ?? "unknown", cache: (existing?.messages?.length ?? 0) > 0 ? "warm" : "cold" });
+    switchingSessionId.value = requestId;
+    if (normalized) setActiveSessionSelection(normalized);
+    sessionDetailLoadingId.value = requestId;
     if (existing) {
       sessions.value = mergeSessionIntoList(sessions.value, existing);
       rememberSessionDetail(existing);
       sessionsReady.value = true;
-      void refreshSessionStatusById(normalized);
     }
     loading.value = true;
-    const selected = await loadWorkbenchSession(normalized, existing);
+    const selected = await loadWorkbenchSession(requestId, existing);
     loading.value = false;
-    clearSessionDetailLoading(normalized);
-    clearSwitchingSession(normalized);
-    if (!isCurrentSessionSelection(requestEpoch, normalized)) return true;
+    clearSessionDetailLoading(requestId);
+    clearSwitchingSession(requestId);
+    if (!isCurrentSessionRequest(requestEpoch, requestId, selected?.sessionId ?? normalized)) return true;
     if (selected && !isArchivedSession(selected)) {
       applySelectedSessionDetail(selected, previousMessages);
       error.value = null;
-      await refreshSelectedSessionStatus(selected);
       await refreshSessions(selected.sessionId);
       finishWorkbenchSessionSwitchFullLoad(selected.sessionId, "ok");
-      return activeSessionId.value === normalized;
+      return activeSessionId.value === selected.sessionId;
     }
-    isolateSessionLoadFailure(normalized, previousSessionId, previousMessages, isArchivedSession(selected) ? "session archived" : "session URL not found");
-    failWorkbenchSessionSwitch(normalized);
+    isolateSessionLoadFailure(requestId, previousSessionId, previousMessages, isArchivedSession(selected) ? "session archived" : "session URL not found", { restorePrevious: Boolean(seed && normalized) });
+    failWorkbenchSessionSwitch(normalized ?? requestId);
     return false;
   }
 
   async function deleteCurrentSession(): Promise<void> {
     const sessionId = activeSessionId.value;
     if (!sessionId) return;
+    error.value = null;
+    const response = await api.agent.deleteAgentSession(sessionId);
+    if (!response.ok) {
+      error.value = response.error ?? "session delete failed";
+      return;
+    }
     sessions.value = sessions.value.filter((session) => session.sessionId !== sessionId);
+    await refreshSessions(null);
     const next = sessions.value.find((session) => !isArchivedSession(session)) ?? null;
     replaceActiveSessionSelection(next?.sessionId ?? null);
     currentRequest.value = null;
@@ -224,7 +233,7 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   async function refreshSessionStatusAuthority(source: WorkbenchSessionRecord[] = sessions.value): Promise<void> {
-    await Promise.all(uniqueSessionIds(source).map((sessionId) => refreshSessionStatusById(sessionId)));
+    void source;
   }
 
   async function refreshSelectedSessionStatus(fallbackSession?: WorkbenchSessionRecord | null): Promise<void> {
@@ -787,6 +796,11 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     return activeSessionId.value === sessionId || switchingSessionId.value === sessionId;
   }
 
+  function isCurrentSessionRequest(epoch: number, requestId: string, selectedSessionId?: string | null): boolean {
+    if (epoch !== selectionEpoch.value) return false;
+    return activeSessionId.value === requestId || switchingSessionId.value === requestId || Boolean(selectedSessionId && (activeSessionId.value === selectedSessionId || switchingSessionId.value === selectedSessionId));
+  }
+
   function clearSwitchingSession(sessionId: string): void {
     if (switchingSessionId.value === sessionId) switchingSessionId.value = null;
   }
@@ -809,9 +823,9 @@ export const useWorkbenchStore = defineStore("workbench", () => {
     restartRealtime("apply-selected-session");
   }
 
-  function isolateSessionLoadFailure(sessionId: string, previousSessionId: string | null, previousMessages: ChatMessage[], message: string): void {
+  function isolateSessionLoadFailure(sessionId: string, previousSessionId: string | null, previousMessages: ChatMessage[], message: string, options: { restorePrevious?: boolean } = {}): void {
     sessions.value = sessions.value.filter((item) => item.sessionId !== sessionId || (item.messages?.length ?? 0) > 0);
-    if (previousSessionId && previousSessionId !== sessionId) {
+    if (options.restorePrevious === true && previousSessionId && previousSessionId !== sessionId) {
       const previous = sessions.value.find((item) => item.sessionId === previousSessionId) ?? null;
       replaceActiveSessionSelection(previousSessionId);
       if (previous) {
@@ -869,14 +883,14 @@ function sessionFromWorkbenchSession(value: unknown): WorkbenchSessionRecord | n
 }
 
 async function loadWorkbenchSession(sessionId: string, seed: WorkbenchSessionRecord | null = null): Promise<WorkbenchSessionRecord | null> {
-  const id = normalizeWorkbenchSessionId(sessionId);
-  if (!id) return null;
-  const [detail, messages] = await Promise.all([
-    api.workbench.session(id),
-    api.workbench.sessionMessages(id, { limit: 100 })
-  ]);
+  const requestId = normalizeWorkbenchSessionRouteId(sessionId);
+  if (!requestId) return null;
+  const detail = await api.workbench.session(requestId);
   if (!detail.ok) return null;
   const detailSession = detail.ok ? sessionFromWorkbenchSession(detail.data?.session) : null;
+  const id = detailSession?.sessionId ?? normalizeWorkbenchSessionId(requestId) ?? seed?.sessionId;
+  if (!id) return null;
+  const messages = await api.workbench.sessionMessages(id, { limit: 100 });
   const base = detailSession ?? seed;
   if (!base) return null;
   const page = messages.ok ? messages.data : null;
diff --git a/web/hwlab-cloud-web/src/utils/index.ts b/web/hwlab-cloud-web/src/utils/index.ts
index 89b5b3dd..40ec5111 100644
--- a/web/hwlab-cloud-web/src/utils/index.ts
+++ b/web/hwlab-cloud-web/src/utils/index.ts
@@ -28,6 +28,12 @@ export function normalizeWorkbenchSessionId(value: unknown): string | null {
   return /^ses_[A-Za-z0-9_.:-]+$/u.test(text) ? text : null;
 }
 
+export function normalizeWorkbenchSessionRouteId(value: unknown): string | null {
+  const text = nonEmptyString(value);
+  if (!text) return null;
+  return normalizeWorkbenchSessionId(text) ?? normalizeWorkbenchConversationId(text);
+}
+
 export function workbenchSessionPath(sessionId: string): string {
   return `/workbench/sessions/${encodeURIComponent(sessionId)}`;
 }
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/deep-link.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/deep-link.spec.ts
index ade6ffed..059ac488 100644
--- a/web/hwlab-cloud-web/tests/workbench-e2e/specs/deep-link.spec.ts
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/deep-link.spec.ts
@@ -24,3 +24,18 @@ test.describe("deep link stale session authority", () => {
     expect((state.legacyRequestLedger as unknown[]).length).toBe(0);
   });
 });
+
+test.describe("legacy cnv deep link canonical authority", () => {
+  test.use({ scenarioId: "legacy-cnv-deeplink-canonical" });
+
+  test("cnv route resolves through backend to canonical session without stale active fallback", async ({ page }) => {
+    await gotoWorkbench(page, "/workbench/sessions/cnv_c5e1330558c94d8e");
+    await expect(page).toHaveURL(/\/workbench\/sessions\/ses_c5e1330558c94d8e$/u);
+    await expect(page.locator(sessionTab("ses_c5e1330558c94d8e"))).toHaveAttribute("data-active", "true");
+    await expect(page.locator(sessionTab("ses_running"))).not.toHaveAttribute("data-active", "true");
+    await expect(page.locator(`${selectors.messageCard}[data-role="agent"][data-status="completed"]`)).toContainText("新增 Python benchmark 脚本");
+    await expect(page.locator(`${selectors.traceTimeline}[data-status="completed"]`)).toBeVisible();
+    const state = await fakeServerState(page);
+    expect((state.legacyRequestLedger as unknown[]).length).toBe(0);
+  });
+});
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/new-session-thread.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/new-session-thread.spec.ts
index 1e6f3a95..47bee4ac 100644
--- a/web/hwlab-cloud-web/tests/workbench-e2e/specs/new-session-thread.spec.ts
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/new-session-thread.spec.ts
@@ -50,3 +50,23 @@ test.describe("server authoritative session create", () => {
     expect((state.legacyRequestLedger as unknown[]).length).toBe(0);
   });
 });
+
+test.describe("session create and delete authority", () => {
+  test.use({ scenarioId: "server-authoritative-create" });
+
+  test("created session becomes active and deleted session stays archived after reload", async ({ page }) => {
+    await gotoWorkbench(page);
+    await page.locator(selectors.sessionCreate).click();
+    await expect(page).toHaveURL(/\/workbench\/sessions\/ses_server_created/u);
+    await expect(page.locator('.session-tab[data-session-id="ses_server_created"]')).toHaveAttribute("data-active", "true");
+    await expect(page.locator(selectors.commandSend)).toBeDisabled();
+
+    await page.locator(selectors.sessionDelete).click();
+    await expect(page.locator('.session-tab[data-session-id="ses_server_created"]')).toHaveCount(0);
+    await page.reload();
+    await expect(page.locator('.session-tab[data-session-id="ses_server_created"]')).toHaveCount(0);
+    const state = await fakeServerState(page);
+    const deleted = (state.sessions as Array<{ sessionId?: string; status?: string }>).find((item) => item.sessionId === "ses_server_created");
+    expect(deleted?.status).toBe("archived");
+  });
+});
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/session-rail-scale.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/session-rail-scale.spec.ts
new file mode 100644
index 00000000..0edfd3a2
--- /dev/null
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/session-rail-scale.spec.ts
@@ -0,0 +1,18 @@
+import { expect, fakeServerState, gotoWorkbench, test } from "../fixtures/test";
+import { selectors } from "../fixtures/selectors";
+
+test.use({ scenarioId: "session-rail-many" });
+
+test("session rail does not issue per-tab status requests", async ({ page }) => {
+  await gotoWorkbench(page);
+  await expect(page.locator(".session-tab")).toHaveCount(50);
+  await page.waitForTimeout(1200);
+  const state = await fakeServerState(page);
+  const requests = state.requestLedger as Array<{ method?: string; path?: string }>;
+  const sessionStatusRequests = requests.filter((request) => /^\/v1\/agent\/sessions\/ses_/u.test(String(request.path ?? "")));
+  const uniquePaths = new Set(sessionStatusRequests.map((request) => request.path));
+  expect(sessionStatusRequests.length).toBeLessThanOrEqual(3);
+  expect(uniquePaths.size).toBeLessThanOrEqual(1);
+  expect((state.legacyRequestLedger as unknown[]).length).toBe(0);
+  await expect(page.locator(selectors.commandInput)).toBeVisible();
+});
diff --git a/web/hwlab-cloud-web/tests/workbench-e2e/specs/status-consistency.spec.ts b/web/hwlab-cloud-web/tests/workbench-e2e/specs/status-consistency.spec.ts
index 22a481ed..99db7805 100644
--- a/web/hwlab-cloud-web/tests/workbench-e2e/specs/status-consistency.spec.ts
+++ b/web/hwlab-cloud-web/tests/workbench-e2e/specs/status-consistency.spec.ts
@@ -30,6 +30,9 @@ test.describe("terminal turn with stale active session authority", () => {
     await expect(page.locator(sessionTab("ses_completed"))).toHaveAttribute("data-status", "completed");
     await expect(page.locator(sessionTab("ses_completed"))).toHaveAttribute("data-running", "false");
     await expect(page.locator(`${selectors.messageCard}[data-role="agent"][data-status="completed"]`)).toContainText("构建和 Trace 渲染检查完成");
+    await expect(page.locator(`${selectors.messageCard}[data-role="agent"][data-status="failed"]`)).toHaveCount(0);
+    await expect(page.locator(selectors.commandSend)).toHaveAttribute("data-action", "turn");
+    await expect(page.locator(".composer-mode")).not.toContainText("运行中");
     await saveScreenshot(page, testInfo, "stale-active-session-terminal-tab");
   });
 });