diff --git a/console/frontend/src/api.ts b/console/frontend/src/api.ts
index d372a02..d2071e5 100644
--- a/console/frontend/src/api.ts
+++ b/console/frontend/src/api.ts
@@ -157,6 +157,10 @@ export const rotateAccount = (id: string) =>
 export const getAccountWorkerSecret = (id: string) =>
   api<{ worker_id: string; secret: string }>(`/api/accounts/${id}/worker-secret`);
 
+/** 重新安装 Worker 脚本:不轮换凭据,用当前模板(Console 地址 + 凭据 token + secret)重渲染上传 */
+export const reinstallAccountWorker = (id: string) =>
+  api<{ ok: boolean; worker_id: string }>(`/api/accounts/${id}/reinstall-worker`, "POST");
+
 /* ---- OAuth ---- */
 
 /** OAuth 是否已配置(cloudflare = 可用;unconfigured = 缺少 client id/secret) */
diff --git a/console/frontend/src/pages/Accounts.tsx b/console/frontend/src/pages/Accounts.tsx
index 235d132..349b683 100644
--- a/console/frontend/src/pages/Accounts.tsx
+++ b/console/frontend/src/pages/Accounts.tsx
@@ -24,6 +24,7 @@ import {
   getAccount,
   listAccounts,
   oauthStart,
+  reinstallAccountWorker,
   rotateAccount,
   updateAccount,
   type AccountDetail,
@@ -428,6 +429,23 @@ function AccountDetailDrawer({
               Email Worker 以该凭据直连 Console(/internal/email/authorize 与 /ingest);轮换后已配置的域名会自动重新部署。
             </Typography.Text>
             <Space wrap>
+              <Button
+                icon={<ReloadOutlined />}
+                onClick={() => {
+                  modal.confirm({
+                    title: `重新安装 ${detail.account.name} 的 Worker 脚本?`,
+                    content: "用当前版本模板重新渲染并上传(凭据不变,已配置域名立即生效);Console 升级后建议执行一次。",
+                    okText: "重新安装",
+                    onOk: async () => {
+                      const res = await reinstallAccountWorker(detail.account.id);
+                      message.success(`Worker 脚本已重新安装(${res.worker_id})`);
+                      onReload();
+                    },
+                  });
+                }}
+              >
+                重新安装 Worker 脚本
+              </Button>
               <Button
                 onClick={async () => {
                   const res = await rotateAccount(detail.account.id);
diff --git a/console/frontend/src/pages/Logs.tsx b/console/frontend/src/pages/Logs.tsx
index 75d12e1..5a5b819 100644
--- a/console/frontend/src/pages/Logs.tsx
+++ b/console/frontend/src/pages/Logs.tsx
@@ -28,6 +28,7 @@ const ACTION_LABEL: Record<string, string> = {
   "account.delete": "删除账号",
   "account.batch_delete": "批量删除账号",
   "account.rotate": "轮换 Worker 凭据",
+  "account.reinstall_worker": "重新安装 Worker 脚本",
   "domain.setup": "配置 Email Workers",
   "domain.delete": "删除域名",
   "domain.batch_delete": "批量删除域名",
diff --git a/console/src/routes/internal.ts b/console/src/routes/internal.ts
index bde791d..9947bf4 100644
--- a/console/src/routes/internal.ts
+++ b/console/src/routes/internal.ts
@@ -50,32 +50,60 @@ export type EmailDecision =
  */
 async function workerAuth(c: Ctx, next: Next) {
   const raw = new Uint8Array(await c.req.arrayBuffer());
-  const cred = await c.env.DB.prepare(
-    `SELECT wc.id, wc.secret_enc, wc.cloudflare_account_id, ca.status AS account_status
-     FROM worker_credentials wc JOIN cloudflare_accounts ca ON ca.id = wc.cloudflare_account_id
-     WHERE wc.worker_id = ? AND wc.status = 'active' ORDER BY wc.created_at DESC LIMIT 1`,
-  )
-    .bind((c.req.header("Authorization") ?? "").replace(/^WmailHub-Worker\s+/, "").trim() || "\u0000")
-    .first<{ id: string; secret_enc: string; cloudflare_account_id: string; account_status: string }>();
-  if (!cred) return c.json({ error: "unknown worker or credential revoked" }, 401);
-
-  const secret = await decryptSecret(c.env, cred.secret_enc);
-  const verdict = await verifyWorkerRequest({
-    secret,
-    method: c.req.method,
-    url: c.req.url,
-    body: raw,
-    headers: c.req.raw.headers,
-  });
-  if (!verdict.ok) return c.json({ error: verdict.error }, verdict.status);
+  // 一个账号一个 token(v2.10.0):凭据 id 即唯一 token,Worker 以它表明身份,先精确匹配。
+  // 兼容旧版 Worker:身份是 worker 脚本名——脚本名只在单个 Cloudflare 账号内唯一,多账号可能
+  // 同名(如都叫 wmailhub-email),此时按名取全部候选逐一验签确定归属;
+  // 只取最新一条会让先接入账号的 Worker 全部 401(v2.9.3~v2.10.0 修复)。
+  const token = (c.req.header("Authorization") ?? "").replace(/^WmailHub-Worker\s+/, "").trim();
+  type CredRow = { id: string; secret_enc: string; cloudflare_account_id: string };
+  let candidates: { results: CredRow[] } = { results: [] };
+  if (token) {
+    candidates = await c.env.DB.prepare(
+      `SELECT wc.id, wc.secret_enc, wc.cloudflare_account_id
+       FROM worker_credentials wc JOIN cloudflare_accounts ca ON ca.id = wc.cloudflare_account_id
+       WHERE wc.id = ? AND wc.status = 'active' AND ca.status != 'revoked'`,
+    )
+      .bind(token)
+      .all<CredRow>();
+    if (candidates.results.length === 0) {
+      candidates = await c.env.DB.prepare(
+        `SELECT wc.id, wc.secret_enc, wc.cloudflare_account_id
+         FROM worker_credentials wc JOIN cloudflare_accounts ca ON ca.id = wc.cloudflare_account_id
+         WHERE wc.worker_id = ? AND wc.status = 'active' AND ca.status != 'revoked'
+         ORDER BY wc.created_at DESC`,
+      )
+        .bind(token)
+        .all<CredRow>();
+    }
+  }
+  let matched: { id: string; cloudflare_account_id: string; nonce: string; timestamp: number } | null = null;
+  let lastError = "unknown worker or credential revoked";
+  let lastStatus: 400 | 401 = 401;
+  for (const cand of candidates.results) {
+    const secret = await decryptSecret(c.env, cand.secret_enc);
+    const verdict = await verifyWorkerRequest({
+      secret,
+      method: c.req.method,
+      url: c.req.url,
+      body: raw,
+      headers: c.req.raw.headers,
+    });
+    if (verdict.ok) {
+      matched = { id: cand.id, cloudflare_account_id: cand.cloudflare_account_id, nonce: verdict.nonce, timestamp: verdict.timestamp };
+      break;
+    }
+    lastError = verdict.error;
+    lastStatus = verdict.status;
+  }
+  if (!matched) return c.json({ error: lastError }, lastStatus);
 
   // nonce 防重放:主键冲突即拒绝
   try {
     await c.env.DB.prepare("INSERT INTO nonces (nonce, account_id, expires_at) VALUES (?, ?, ?)")
       .bind(
-        verdict.nonce,
-        cred.cloudflare_account_id,
-        new Date((verdict.timestamp + NONCE_TTL_SECONDS) * 1000).toISOString(),
+        matched.nonce,
+        matched.cloudflare_account_id,
+        new Date((matched.timestamp + NONCE_TTL_SECONDS) * 1000).toISOString(),
       )
       .run();
   } catch {
@@ -88,15 +116,15 @@ async function workerAuth(c: Ctx, next: Next) {
      FROM worker_credentials wc JOIN cloudflare_accounts ca ON ca.id = wc.cloudflare_account_id
      WHERE wc.id = ?`,
   )
-    .bind(cred.id)
+    .bind(matched.id)
     .first<{ cred_status: string; account_status: string }>();
   if (!fresh || fresh.cred_status !== "active" || fresh.account_status === "revoked") {
     return c.json({ error: "credential revoked" }, 401);
   }
 
   c.set("rawBody", raw);
-  c.set("workerCredentialId", cred.id);
-  c.set("workerAccountId", cred.cloudflare_account_id);
+  c.set("workerCredentialId", matched.id);
+  c.set("workerAccountId", matched.cloudflare_account_id);
   await next();
 }
 
diff --git a/console/src/routes/resources.ts b/console/src/routes/resources.ts
index 66c9cf9..378c326 100644
--- a/console/src/routes/resources.ts
+++ b/console/src/routes/resources.ts
@@ -16,7 +16,7 @@
 import { Hono } from "hono";
 import type { Env, AppVars } from "../env.ts";
 import { requireSession } from "../middleware.ts";
-import { loadSteps, setupDomainEmail, upsertMailbox, createAccount, provisionAccount, teardownAccountResources, teardownDomainRouting, type TeardownResult } from "../services/provision.ts";
+import { loadSteps, setupDomainEmail, upsertMailbox, createAccount, provisionAccount, deployAccountWorker, teardownAccountResources, teardownDomainRouting, type TeardownResult } from "../services/provision.ts";
 import { getCFApi } from "../services/cfapi.ts";
 import { logOperation, operatorName } from "../services/logs.ts";
 import { encryptSecret, keyHash, decryptAccountToken, decryptSecret, saveConnection } from "../db.ts";
@@ -279,6 +279,33 @@ function installAccountRoutes(app: App) {
 
   /** 轮换 Worker credential:撤销旧 credential 并签发新 secret(仅本次响应可见);
    *  已配置 Email Workers 的域名自动重新部署脚本以携带新 secret。 */
+  /** 重新安装 Worker 脚本:不轮换凭据,按当前模板(Console 地址 + 凭据 token + secret)重渲染并上传。
+   *  用于 Console 升级后把已有账号的 Worker 推到最新脚本(如 v2.10.0 一账号一 token 版);幂等。 */
+  app.post("/accounts/:id/reinstall-worker", async (c) => {
+    const id = c.req.param("id");
+    const account = await c.env.DB.prepare(
+      "SELECT id, name, worker_id FROM cloudflare_accounts WHERE id = ? AND status != 'revoked'",
+    )
+      .bind(id)
+      .first<{ id: string; name: string; worker_id: string | null }>();
+    if (!account) return c.json({ error: "not found" }, 404);
+    if (!account.worker_id) return c.json({ error: "worker not provisioned yet" }, 400);
+
+    const accessToken = await decryptAccountToken(c.env, id);
+    if (!accessToken) return c.json({ error: "no active Cloudflare connection for this account" }, 400);
+
+    const workerId = await deployAccountWorker(c.env, id, accessToken);
+    await logOperation(c.env, {
+      action: "account.reinstall_worker",
+      targetType: "account",
+      targetId: id,
+      targetName: account.name ?? null,
+      detail: { worker_id: workerId },
+      operator: await operatorName(c.env, c.get("userId")),
+    });
+    return c.json({ ok: true, worker_id: workerId });
+  });
+
   app.post("/accounts/:id/rotate", async (c) => {
     const id = c.req.param("id");
     const account = await c.env.DB.prepare(
diff --git a/console/src/services/cfapi.ts b/console/src/services/cfapi.ts
index 3785340..fe80953 100644
--- a/console/src/services/cfapi.ts
+++ b/console/src/services/cfapi.ts
@@ -432,8 +432,8 @@ export interface CFApi {
     scriptName: string;
     /** Console 对外地址(Worker -> Console) **/
     consoleUrl: string;
-    /** Worker 身份(与 WorkerCredential.worker_id 一致) **/
-    workerId: string;
+    /** 凭据 token(= worker_credentials.id,一账号一个,Worker 以此表明身份) **/
+    credentialToken: string;
     /** Worker credential secret(HMAC 签名密钥) **/
     workerSecret: string;
   }): Promise<{ id: string }>;
@@ -590,12 +590,12 @@ export class RealCFApi implements CFApi {
     accountId: string;
     scriptName: string;
     consoleUrl: string;
-    workerId: string;
+    credentialToken: string;
     workerSecret: string;
   }) {
-    // Email Worker 即带 email handler 的 Worker 脚本;Console 地址与 Worker 凭据以明文常量打进脚本,
-    // 避免给 Worker 配置额外的 secrets 绑定(docs/11 §8:凭据本身经 HMAC 保护 Console API)。
-    const script = renderEmailWorkerScript(opts.consoleUrl, opts.workerId, opts.workerSecret);
+    // Email Worker 即带 email handler 的 Worker 脚本;Console 地址与凭据(token + secret)以明文常量
+    // 打进脚本,避免给 Worker 配置额外的 secrets 绑定(docs/11 §8:凭据本身经 HMAC 保护 Console API)。
+    const script = renderEmailWorkerScript(opts.consoleUrl, opts.credentialToken, opts.workerSecret);
     const form = new FormData();
     form.append(
       "metadata",
diff --git a/console/src/services/provision.ts b/console/src/services/provision.ts
index 4b6addb..e622a48 100644
--- a/console/src/services/provision.ts
+++ b/console/src/services/provision.ts
@@ -205,7 +205,7 @@ export async function provisionAccount(env: Env, input: ProvisionInput): Promise
 
 /** # 函数
  * 部署(或更新)账号级 Email Worker:
- * 确保 Worker credential -> 渲染脚本(Console 地址 + Worker ID + secret)-> 上传 Cloudflare。
+ * 确保 Worker credential -> 渲染脚本(Console 地址 + 凭据 token(= credential id,一账号一 token)+ secret)-> 上传 Cloudflare。
  * credential 已存在时复用旧 secret(重新上传脚本不轮换密钥);secret 仅在首次签发时用于部署。
  */
 export async function deployAccountWorker(env: Env, accountId: string, accessToken: string): Promise<string> {
@@ -215,19 +215,19 @@ export async function deployAccountWorker(env: Env, accountId: string, accessTok
   if (!account?.cloudflare_account_id) throw new Error("account not connected via OAuth");
 
   const workerId = await getOrCreateWorkerId(env, accountId);
-  const { secret } = await ensureWorkerCredential(env, accountId, workerId);
-  if (!secret) {
+  const ensured = await ensureWorkerCredential(env, accountId, workerId);
+  if (!ensured.secret) {
     // 已有 credential:重新上传脚本时需要原 secret,先解密
     const row = await env.DB.prepare(
-      "SELECT secret_enc FROM worker_credentials WHERE cloudflare_account_id = ? AND worker_id = ? AND status = 'active' ORDER BY created_at DESC LIMIT 1",
+      "SELECT id, secret_enc FROM worker_credentials WHERE cloudflare_account_id = ? AND worker_id = ? AND status = 'active' ORDER BY created_at DESC LIMIT 1",
     )
       .bind(accountId, workerId)
-      .first<{ secret_enc: string }>();
+      .first<{ id: string; secret_enc: string }>();
     const decrypted = row ? await decryptSecret(env, row.secret_enc) : null;
-    await putWorkerScript(env, accessToken, account.cloudflare_account_id, workerId, decrypted ?? "");
+    await putWorkerScript(env, accessToken, account.cloudflare_account_id, workerId, row?.id ?? ensured.credentialId, decrypted ?? "");
     return workerId;
   }
-  await putWorkerScript(env, accessToken, account.cloudflare_account_id, workerId, secret);
+  await putWorkerScript(env, accessToken, account.cloudflare_account_id, workerId, ensured.credentialId, ensured.secret);
   return workerId;
 }
 
@@ -254,12 +254,13 @@ async function putWorkerScript(
   accessToken: string,
   cfAccountId: string,
   workerId: string,
+  credentialToken: string,
   workerSecret: string,
 ): Promise<void> {
   const cf: CFApi = await getCFApi(env);
   const consoleUrl = env.PUBLIC_BASE_URL ?? "";
   if (!consoleUrl) throw new Error("console public url unknown (PUBLIC_BASE_URL)");
-  await cf.putEmailWorker({ accessToken, accountId: cfAccountId, scriptName: workerId, consoleUrl, workerId, workerSecret });
+  await cf.putEmailWorker({ accessToken, accountId: cfAccountId, scriptName: workerId, consoleUrl, credentialToken, workerSecret });
 }
 
 /** # 函数
diff --git a/docs/04_NODE_PROTOCOL.md b/docs/04_NODE_PROTOCOL.md
index 3d19ad9..81fb3f8 100644
--- a/docs/04_NODE_PROTOCOL.md
+++ b/docs/04_NODE_PROTOCOL.md
@@ -1,12 +1,17 @@
 # Email Worker <-> Console 内部协议(docs/11 §8,协议版本 1)
 
 `/internal/email/authorize` 与 `/internal/email/ingest` 都是内部 API,不能匿名访问。
-每个请求必须满足:HTTPS + Worker ID + timestamp + nonce + body SHA256 + HMAC-SHA256。
+每个请求必须满足:HTTPS + 凭据 token + timestamp + nonce + body SHA256 + HMAC-SHA256。
+
+**身份 = 凭据 token(v2.10.0 起)**:`Authorization` 里放 `worker_credentials.id`(一账号一个,
+部署 Worker 时烤进脚本),Console 按它精确定位凭据与所属账号。兼容:旧版 Worker 放的是
+worker 脚本名——脚本名只在单个 Cloudflare 账号内唯一,多账号同名时 Console 会取全部同名
+凭据逐一验签确定归属(v2.9.3 引入;只取一条会让先接入账号全部 401)。
 
 ## 请求头
 
 ```text
-Authorization: WmailHub-Worker <worker_id>
+Authorization: WmailHub-Worker <credential_token>
 X-WmailHub-Timestamp: <unix_seconds>
 X-WmailHub-Nonce: <random>
 X-WmailHub-Body-SHA256: <hex>
@@ -24,7 +29,7 @@ signature  = HMAC-SHA256(worker_credential_secret, canonical)
 
 ## Console 必须校验
 
-1. Worker ID(存在且 credential active);
+1. 凭据 token(存在且 credential active;旧脚本名按同名候选逐一验签);
 2. timestamp(默认窗口 5 分钟);
 3. nonce 不重复(唯一索引入库,主键冲突即 replay);
 4. body hash;
diff --git a/docs/11_REFACTOR_PLAN.md b/docs/11_REFACTOR_PLAN.md
index 670f2d7..3df7a17 100644
--- a/docs/11_REFACTOR_PLAN.md
+++ b/docs/11_REFACTOR_PLAN.md
@@ -232,7 +232,7 @@ Authorization 和 Ingest 都必须是内部 API，不能匿名访问。
 
 请求头：
 
-    Authorization: WmailHub-Worker <worker_id>
+    Authorization: WmailHub-Worker <credential_token>  # v2.10.0 起为凭据 id(一账号一个);旧版为脚本名
     X-WmailHub-Timestamp: <unix_seconds>
     X-WmailHub-Nonce: <random>
     X-WmailHub-Body-SHA256: <sha256>
diff --git a/package.json b/package.json
index 7a23f01..21435d3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wmailhub",
-  "version": "2.9.2",
+  "version": "2.10.0",
   "description": "WmailHub - 基于 Cloudflare Email Workers 的轻量邮件接收与转发平台(Console 直连 Email Worker)",
   "private": true,
   "type": "module",
diff --git a/shared/src/email-worker-template.ts b/shared/src/email-worker-template.ts
index d43f619..66d2163 100644
--- a/shared/src/email-worker-template.ts
+++ b/shared/src/email-worker-template.ts
@@ -3,9 +3,9 @@
  *
  * Console 在「Connect Cloudflare Account」/ 域名配置 Email Workers 时,通过 Cloudflare API
  * 把该脚本上传为账号级 Email Worker,并以占位符注入三组配置:
- *   __CONSOLE_URL__   Console 对外地址(Worker -> Console 的目标)
- *   __WORKER_ID__     Worker 身份(与 WorkerCredential.worker_id 一致)
- *   __WORKER_SECRET__ Worker credential secret(HMAC 签名密钥)
+ *   __CONSOLE_URL__       Console 对外地址(Worker -> Console 的目标)
+ *   __CREDENTIAL_TOKEN__  凭据 token(= worker_credentials.id,一账号一个;Worker 以此表明身份)
+ *   __WORKER_SECRET__     Worker credential secret(HMAC 签名密钥)
  *
  * 邮件流程:authorize(接受/拒绝/临时错误) -> accept 时 ingest 原始 MIME -> reject 时 setReject。
  * worker/(本地开发版)与该模板保持同一逻辑。
@@ -14,7 +14,7 @@
 export const EMAIL_WORKER_SCRIPT = String.raw`// WmailHub Email Worker (auto-generated by Console provisioning)
 // Cloudflare Email Routing -> Email Worker -> WmailHub Console(docs/11)
 const CONSOLE_URL = "__CONSOLE_URL__";
-const WORKER_ID = "__WORKER_ID__";
+const CREDENTIAL_TOKEN = "__CREDENTIAL_TOKEN__";
 const WORKER_SECRET = "__WORKER_SECRET__";
 
 export default {
@@ -82,7 +82,7 @@ async function signedHeaders(method, path, body) {
   const bh = await sha256Hex(body);
   const signature = await hmac(WORKER_SECRET, [method, path, timestamp, nonce, bh].join("\n"));
   return {
-    "Authorization": "WmailHub-Worker " + WORKER_ID,
+    "Authorization": "WmailHub-Worker " + CREDENTIAL_TOKEN,
     "X-WmailHub-Timestamp": timestamp,
     "X-WmailHub-Nonce": nonce,
     "X-WmailHub-Body-SHA256": bh,
@@ -169,15 +169,15 @@ async function handleEmail(env, message) {
 
 /** # 函数
  * 用实际 Console 地址与 Worker 凭据渲染 Email Worker 脚本
- * 参数: consoleUrl - Console 对外地址;workerId - Worker 身份;workerSecret - credential secret
+ * 参数: consoleUrl - Console 对外地址;credentialToken - 凭据 token(worker_credentials.id,一账号一个);workerSecret - credential secret
  * 返回值: 可直接上传 Cloudflare 的脚本字符串
  */
 export function renderEmailWorkerScript(
   consoleUrl: string,
-  workerId: string,
+  credentialToken: string,
   workerSecret: string,
 ): string {
   return EMAIL_WORKER_SCRIPT.replace("__CONSOLE_URL__", consoleUrl)
-    .replace("__WORKER_ID__", workerId)
+    .replace("__CREDENTIAL_TOKEN__", credentialToken)
     .replace("__WORKER_SECRET__", workerSecret);
 }
diff --git a/shared/src/protocol.ts b/shared/src/protocol.ts
index 1b34c1a..9e26a04 100644
--- a/shared/src/protocol.ts
+++ b/shared/src/protocol.ts
@@ -8,7 +8,9 @@
  *   signature  = HMAC-SHA256(worker_credential_secret, canonical)
  *
  * 请求头:
- *   Authorization: WmailHub-Worker <worker_id>
+ *   Authorization: WmailHub-Worker <credential_token>
+ *   (v2.10.0 起身份是凭据 token = worker_credentials.id,一账号一个;旧版 Worker 传脚本名,
+ *    Console 按名取全部同名候选逐一验签兼容)
  *   X-WmailHub-Timestamp / X-WmailHub-Nonce / X-WmailHub-Body-SHA256 /
  *   X-WmailHub-Signature / X-WmailHub-Protocol
  *
@@ -65,13 +67,13 @@ export async function computeSignature(secret: string, c: SignatureComponents):
 
 /** # 函数
  * Worker 端:为发往 Console 内部 API 的请求生成全部签名请求头
- * 参数: secret - worker credential secret;workerId - Email Worker 身份(脚本名);
- *       method/url 同 HTTP 语义;body - 原始请求体
+ * 参数: secret - worker credential secret;token - 凭据 token(worker_credentials.id,一账号一个;
+ *       旧版 Worker 传脚本名,Console 兼容);method/url 同 HTTP 语义;body - 原始请求体
  * 返回值: 可直接放入 fetch headers 的对象
  */
 export async function signWorkerRequest(
   secret: string,
-  workerId: string,
+  token: string,
   method: string,
   url: string,
   body: Uint8Array,
@@ -88,7 +90,7 @@ export async function signWorkerRequest(
     bodyHash: bh,
   });
   return {
-    "Authorization": `WmailHub-Worker ${workerId}`,
+    "Authorization": `WmailHub-Worker ${token}`,
     "X-WmailHub-Timestamp": timestamp,
     "X-WmailHub-Nonce": nonce,
     "X-WmailHub-Body-SHA256": bh,
@@ -99,7 +101,7 @@ export async function signWorkerRequest(
 
 /** # 成员变量: verifyWorkerRequest 的输入 **/
 export interface VerifyWorkerRequestInput {
-  /** 请求方声明的 credential secret(Console 从库中按 worker_id 取出) **/
+  /** 请求方声明的 credential secret(Console 按请求身份(token/脚本名)取出) **/
   secret: string;
   /** HTTP 方法 **/
   method: string;
diff --git a/tests/authorize.test.ts b/tests/authorize.test.ts
index 8fd7431..3abd5ef 100644
--- a/tests/authorize.test.ts
+++ b/tests/authorize.test.ts
@@ -132,6 +132,60 @@ describe("POST /internal/email/authorize 决策矩阵", () => {
     expect(((await resp.json()) as Decision).decision).toBe("accept");
   });
 
+  test("同名 worker 跨账号:凭据按签名归属,不得只取最新一条(v2.9.3 回归)", async () => {
+    const t = await makeTestEnv();
+    const now = new Date().toISOString();
+    // 第二个账号部署了与默认账号同名的 worker 脚本,凭据创建更晚
+    await t.env.DB.prepare(
+      "INSERT INTO cloudflare_accounts (id, name, cloudflare_account_id, worker_id, status, provision_steps, created_at, updated_at) VALUES ('acct_later', 'later-account', 'cfacct-2', ?, 'active', '{}', ?, ?)",
+    )
+      .bind(t.workerId, now, now)
+      .run();
+    const laterSecret = "whs_later_account_secret";
+    await t.env.DB.prepare(
+      "INSERT INTO worker_credentials (id, cloudflare_account_id, worker_id, secret_hash, secret_enc, secret_last4, status, created_at) VALUES ('wcred_later', 'acct_later', ?, ?, ?, ?, 'active', ?)",
+    )
+      .bind(t.workerId, await sha256Hex(laterSecret), await encryptSecret(t.env, laterSecret), laterSecret.slice(-4), now)
+      .run();
+    await t.env.DB.prepare(
+      "INSERT INTO domains (id, cloudflare_account_id, account_id, name, status, created_at, updated_at) VALUES ('dom_later', 'cfacct-2', 'acct_later', 'later.test', 'active', ?, ?)",
+    )
+      .bind(now, now)
+      .run();
+    await t.env.DB.prepare(
+      "INSERT INTO mailboxes (id, domain_id, address, status, is_catch_all, created_at, updated_at) VALUES ('mbx_later', 'dom_later', '*@later.test', 'active', 1, ?, ?)",
+    )
+      .bind(now, now)
+      .run();
+
+    // 先接入账号的 secret 签名(身份=脚本名,兼容路径) -> 必须验到先接入的凭据上(v2.9.3 前被最新凭据压住而 401)
+    const first = await authorize(t, "hello@example.test");
+    expect(first.status).toBe(200);
+    expect(first.body.decision).toBe("accept");
+
+    // 后接入账号的 secret 签名(身份=脚本名,兼容路径) -> 归属到后接入账号,它自己的域名 accept
+    const later = await t.app.fetch(
+      await signedAuthorizeRequest(t, "hello@later.test", "a@b.c", { workerId: t.workerId, secret: laterSecret }),
+      t.env,
+    );
+    expect(later.status).toBe(200);
+    expect(((await later.json()) as Decision).decision).toBe("accept");
+
+    // v2.10.0 一账号一 token:身份=凭据 id,精确匹配;token 钉死凭据,错 secret 直接 401
+    const tokenFirst = await t.app.fetch(
+      await signedAuthorizeRequest(t, "hello@example.test", "a@b.c", { workerId: "wcred1", secret: "wrong-secret" }),
+      t.env,
+    );
+    expect(tokenFirst.status).toBe(401);
+
+    const tokenLater = await t.app.fetch(
+      await signedAuthorizeRequest(t, "hello@later.test", "a@b.c", { workerId: "wcred_later", secret: laterSecret }),
+      t.env,
+    );
+    expect(tokenLater.status).toBe(200);
+    expect(((await tokenLater.json()) as Decision).decision).toBe("accept");
+  });
+
   test("畸形收件人 -> reject MAILBOX_NOT_FOUND(不抛 500)", async () => {
     const t = await makeTestEnv();
     for (const bad of ["no-at-sign", "@example.test", "a@"]) {
@@ -170,7 +224,7 @@ function makeWorkerEnv(opts: FakeConsoleOptions): WorkerEnv {
   }) as typeof fetch;
   return {
     CONSOLE_URL: "http://fake-console",
-    WORKER_ID: "wmailhub-email-test",
+    CREDENTIAL_TOKEN: "wcred_test_token",
     WORKER_SECRET: "whs_fake_secret",
     fetchImpl,
   };
diff --git a/tests/helpers.ts b/tests/helpers.ts
index 6fd0463..bbf653c 100644
--- a/tests/helpers.ts
+++ b/tests/helpers.ts
@@ -140,7 +140,7 @@ export async function loginCookie(test: TestEnv): Promise<string> {
 export interface SignOverrides {
   /** 换用错误 secret(签名必然不匹配) **/
   secret?: string;
-  /** 声明其它 worker_id **/
+  /** 请求方声明的身份(token=凭据 id,或旧版 Worker 的脚本名) **/
   workerId?: string;
   /** 篡改 Authorization */
   tamperSignature?: boolean;
diff --git a/tests/reinstall_worker.test.ts b/tests/reinstall_worker.test.ts
new file mode 100644
index 0000000..42aff64
--- /dev/null
+++ b/tests/reinstall_worker.test.ts
@@ -0,0 +1,21 @@
+/** 重新安装 Worker 脚本端点测试(v2.10.0):权限/前置校验,不轮换凭据 */
+import { describe, expect, test } from "bun:test";
+import { authedFetch, loginCookie, makeTestEnv } from "./helpers.ts";
+
+describe("POST /api/accounts/:id/reinstall-worker", () => {
+  test("不存在的账号 -> 404", async () => {
+    const t = await makeTestEnv();
+    const cookie = await loginCookie(t);
+    const resp = await authedFetch(t, cookie, "http://localhost/api/accounts/acct_no_such/reinstall-worker", { method: "POST" });
+    expect(resp.status).toBe(404);
+  });
+
+  test("无 Cloudflare 连接凭据 -> 400(不触碰 Cloudflare,不留半截状态)", async () => {
+    const t = await makeTestEnv();
+    const cookie = await loginCookie(t);
+    // 种子账号有 worker_id 但没有 oauth_connections/token -> 应明确报错而非 500
+    const resp = await authedFetch(t, cookie, `http://localhost/api/accounts/${t.accountId}/reinstall-worker`, { method: "POST" });
+    expect(resp.status).toBe(400);
+    expect(((await resp.json()) as { error: string }).error).toContain("no active Cloudflare connection");
+  });
+});
diff --git a/tests/ui-smoke.ts b/tests/ui-smoke.ts
index bca8e16..3d3841a 100644
--- a/tests/ui-smoke.ts
+++ b/tests/ui-smoke.ts
@@ -82,6 +82,19 @@ await page.waitForSelector("text=域名级 Webhook", { timeout: 8000 });
 check("域名详情抽屉(Email Workers + Webhook 配置)", true);
 await page.screenshot({ path: `${SHOT_DIR}/07-domain-drawer.png` });
 await page.keyboard.press("Escape");
+await page.waitForTimeout(400);
+
+// 4b. 账号详情抽屉:「重新安装 Worker 脚本」按钮(v2.10.0)
+await page.goto(`${BASE}/accounts`, { waitUntil: "domcontentloaded" });
+await page.waitForSelector(".ant-table-row", { timeout: 8000 });
+await page.locator(".ant-table-row").first().click();
+await page.waitForSelector(".ant-drawer-open", { timeout: 8000 });
+const hasReinstall =
+  (await page.locator(".ant-drawer button:has-text('重新安装 Worker 脚本')").count()) > 0;
+check("账号详情抽屉含「重新安装 Worker 脚本」按钮", hasReinstall);
+await page.screenshot({ path: `${SHOT_DIR}/07b-account-drawer.png` });
+await page.keyboard.press("Escape");
+await page.waitForTimeout(400);
 
 // 5. 邮件详情(点击第一行)
 await page.goto(`${BASE}/inboxs`, { waitUntil: "domcontentloaded" });
diff --git a/worker/src/env.ts b/worker/src/env.ts
index 1fc53f8..b65bc11 100644
--- a/worker/src/env.ts
+++ b/worker/src/env.ts
@@ -4,8 +4,8 @@
 export interface WorkerEnv {
   /** Console 对外地址(Worker -> Console 的目标) **/
   CONSOLE_URL: string;
-  /** Worker 身份(与 WorkerCredential.worker_id 一致) **/
-  WORKER_ID: string;
+  /** 凭据 token(= worker_credentials.id,一账号一个;Worker 以此表明身份) **/
+  CREDENTIAL_TOKEN: string;
   /** Worker credential secret(HMAC 签名密钥) **/
   WORKER_SECRET: string;
   /** 测试注入:替换 fetch 实现(单测用;缺省用全局 fetch) **/
diff --git a/worker/src/index.ts b/worker/src/index.ts
index c43445d..a166d9c 100644
--- a/worker/src/index.ts
+++ b/worker/src/index.ts
@@ -50,7 +50,7 @@ export interface HandleEmailResult {
 export async function authorizeEmail(env: WorkerEnv, recipient: string, sender: string): Promise<HandleEmailResult> {
   const doFetch = env.fetchImpl ?? fetch;
   const body = new TextEncoder().encode(JSON.stringify({ recipient, sender }));
-  const headers = await signWorkerRequest(env.WORKER_SECRET, env.WORKER_ID, "POST", `${env.CONSOLE_URL}${EMAIL_AUTHORIZE_PATH}`, body);
+  const headers = await signWorkerRequest(env.WORKER_SECRET, env.CREDENTIAL_TOKEN, "POST", `${env.CONSOLE_URL}${EMAIL_AUTHORIZE_PATH}`, body);
   let resp: Response;
   try {
     resp = await doFetch(`${env.CONSOLE_URL}${EMAIL_AUTHORIZE_PATH}`, {
@@ -94,7 +94,7 @@ export async function ingestEmail(
 ): Promise<HandleEmailResult> {
   const doFetch = env.fetchImpl ?? fetch;
   const bytes = raw instanceof Uint8Array ? raw : new Uint8Array(raw);
-  const headers = await signWorkerRequest(env.WORKER_SECRET, env.WORKER_ID, "POST", `${env.CONSOLE_URL}${EMAIL_INGEST_PATH}`, bytes);
+  const headers = await signWorkerRequest(env.WORKER_SECRET, env.CREDENTIAL_TOKEN, "POST", `${env.CONSOLE_URL}${EMAIL_INGEST_PATH}`, bytes);
   let resp: Response;
   try {
     resp = await doFetch(`${env.CONSOLE_URL}${EMAIL_INGEST_PATH}`, {
diff --git a/worker/src/local.ts b/worker/src/local.ts
index d6896bb..cab3ad9 100644
--- a/worker/src/local.ts
+++ b/worker/src/local.ts
@@ -11,12 +11,12 @@ import type { WorkerEnv } from "./env.ts";
 
 const env: WorkerEnv = {
   CONSOLE_URL: process.env.CONSOLE_URL ?? "http://127.0.0.1:18787",
-  WORKER_ID: process.env.WORKER_ID ?? "",
+  CREDENTIAL_TOKEN: process.env.CREDENTIAL_TOKEN ?? "",
   WORKER_SECRET: process.env.WORKER_SECRET ?? "",
 };
 
-if (!env.WORKER_ID || !env.WORKER_SECRET) {
-  console.error("missing WORKER_ID / WORKER_SECRET env");
+if (!env.CREDENTIAL_TOKEN || !env.WORKER_SECRET) {
+  console.error("missing CREDENTIAL_TOKEN / WORKER_SECRET env");
   process.exit(1);
 }
 
@@ -33,7 +33,7 @@ console.log(
     lvl: "info",
     msg: "email worker started",
     port: PORT,
-    worker_id: env.WORKER_ID,
+    credential_token: env.CREDENTIAL_TOKEN,
     console_url: env.CONSOLE_URL,
   }),
 );