diff --git a/.env.server.example b/.env.server.example
index e4110f1e..3e785dec 100644
--- a/.env.server.example
+++ b/.env.server.example
@@ -113,6 +113,11 @@ DB_BACKUP_KEEP=2
 
 # Admin
 ADMIN_SESSION_SECRET=change-me-long-random-session-secret
+# 会话滑动续期：不配置时后台 24h 空闲 / 7d 绝对上限，打手 7d 空闲 / 30d 绝对上限。
+# ADMIN_SESSION_IDLE_TTL_HOURS=24
+# ADMIN_SESSION_ABSOLUTE_TTL_HOURS=168
+# WORKER_SESSION_IDLE_TTL_HOURS=168
+# WORKER_SESSION_ABSOLUTE_TTL_HOURS=720
 ADMIN_DEFAULT_USERS_JSON=[{"username":"admin","password":"change-me-admin-password","role":"admin"},{"username":"operator","password":"change-me-operator-password","role":"operator"}]
 
 # 生产环境必须使用显式来源白名单，多个来源用逗号分隔。
diff --git a/apps/backend/src/config/defaults.ts b/apps/backend/src/config/defaults.ts
index 761c2382..2c6fd8cf 100644
--- a/apps/backend/src/config/defaults.ts
+++ b/apps/backend/src/config/defaults.ts
@@ -67,7 +67,9 @@ export function createDefaultRuntimeConfig(projectRoot: string): RuntimeConfig {
 
     admin: {
       sessionSecret: '',
-      sessionTtlHours: 12,
+      // 后台：24h 空闲过期，登录后最多 7 天必须重新登录。
+      sessionIdleTtlHours: 24,
+      sessionAbsoluteTtlHours: 168,
       defaultUsers: [],
     },
 
@@ -122,6 +124,9 @@ export function createDefaultRuntimeConfig(projectRoot: string): RuntimeConfig {
         dailyLimit: 10,
       },
       orderTimelineVisible: false,
+      // 打手：7 天空闲过期，登录后最多 30 天必须重新登录。
+      sessionIdleTtlHours: 168,
+      sessionAbsoluteTtlHours: 720,
     },
   }
 }
diff --git a/apps/backend/src/config/env-overrides.test.ts b/apps/backend/src/config/env-overrides.test.ts
index 1e905708..7952588b 100644
--- a/apps/backend/src/config/env-overrides.test.ts
+++ b/apps/backend/src/config/env-overrides.test.ts
@@ -128,7 +128,8 @@ function createRuntimeConfig(): RuntimeConfig {
     },
     admin: {
       sessionSecret: '',
-      sessionTtlHours: 12,
+      sessionIdleTtlHours: 24,
+      sessionAbsoluteTtlHours: 168,
       defaultUsers: [],
     },
     platforms: {
@@ -177,6 +178,8 @@ function createRuntimeConfig(): RuntimeConfig {
         dailyLimit: 10,
       },
       orderTimelineVisible: false,
+      sessionIdleTtlHours: 168,
+      sessionAbsoluteTtlHours: 720,
     },
     cors: {
       allowedOrigins: ['*'],
diff --git a/apps/backend/src/config/env-overrides.ts b/apps/backend/src/config/env-overrides.ts
index a46557fa..7957e163 100644
--- a/apps/backend/src/config/env-overrides.ts
+++ b/apps/backend/src/config/env-overrides.ts
@@ -56,7 +56,12 @@ export const ENV_OVERRIDES: readonly EnvOverride[] = [
   stringEnv('STORAGE_OSS_REGION', ['storage', 'oss', 'region']),
   integerEnv('CLAIM_TOKEN_TTL_HOURS', ['orders', 'tokenTtlHours']),
   stringEnv('ADMIN_SESSION_SECRET', ['admin', 'sessionSecret']),
-  integerEnv('ADMIN_SESSION_TTL_HOURS', ['admin', 'sessionTtlHours']),
+  // 兼容旧变量：固定 TTL 时代按“绝对上限”理解，空闲窗口仍用新默认值并被绝对上限钳制。
+  integerEnv('ADMIN_SESSION_TTL_HOURS', ['admin', 'sessionAbsoluteTtlHours']),
+  integerEnv('ADMIN_SESSION_IDLE_TTL_HOURS', ['admin', 'sessionIdleTtlHours']),
+  integerEnv('ADMIN_SESSION_ABSOLUTE_TTL_HOURS', ['admin', 'sessionAbsoluteTtlHours']),
+  integerEnv('WORKER_SESSION_IDLE_TTL_HOURS', ['worker', 'sessionIdleTtlHours']),
+  integerEnv('WORKER_SESSION_ABSOLUTE_TTL_HOURS', ['worker', 'sessionAbsoluteTtlHours']),
   adminUsersJsonEnv('ADMIN_DEFAULT_USERS_JSON', ['admin', 'defaultUsers']),
   stringEnv('KAQUAN91_USER_ID', ['platforms', 'ninetyone', 'userId']),
   stringEnv('KAQUAN91_SECRET', ['platforms', 'ninetyone', 'secret']),
diff --git a/apps/backend/src/config/runtime-validation.test.ts b/apps/backend/src/config/runtime-validation.test.ts
index 6e677212..b462f28f 100644
--- a/apps/backend/src/config/runtime-validation.test.ts
+++ b/apps/backend/src/config/runtime-validation.test.ts
@@ -192,7 +192,8 @@ function createRuntimeConfig(overrides: Record<string, unknown> = {}): RuntimeCo
       },
       admin: {
         sessionSecret: '0123456789abcdef0123456789abcdef',
-        sessionTtlHours: 12,
+        sessionIdleTtlHours: 24,
+        sessionAbsoluteTtlHours: 168,
         defaultUsers: [
           {
             username: 'admin',
@@ -247,6 +248,8 @@ function createRuntimeConfig(overrides: Record<string, unknown> = {}): RuntimeCo
           dailyLimit: 10,
         },
         orderTimelineVisible: false,
+        sessionIdleTtlHours: 168,
+        sessionAbsoluteTtlHours: 720,
       },
     },
     overrides,
diff --git a/apps/backend/src/config/runtime-validation.ts b/apps/backend/src/config/runtime-validation.ts
index 0bff6af6..2defbc07 100644
--- a/apps/backend/src/config/runtime-validation.ts
+++ b/apps/backend/src/config/runtime-validation.ts
@@ -97,7 +97,16 @@ export function validateRuntimeConfig(
     })
   }
   requireInteger(issues, 'orders.tokenTtlHours', config.orders?.tokenTtlHours, { min: 0 })
-  requireInteger(issues, 'admin.sessionTtlHours', config.admin?.sessionTtlHours, { min: 1 })
+  requireInteger(issues, 'admin.sessionIdleTtlHours', config.admin?.sessionIdleTtlHours, { min: 1 })
+  requireInteger(issues, 'admin.sessionAbsoluteTtlHours', config.admin?.sessionAbsoluteTtlHours, {
+    min: 1,
+  })
+  requireInteger(issues, 'worker.sessionIdleTtlHours', config.worker?.sessionIdleTtlHours, {
+    min: 1,
+  })
+  requireInteger(issues, 'worker.sessionAbsoluteTtlHours', config.worker?.sessionAbsoluteTtlHours, {
+    min: 1,
+  })
 
   validateOptionalHttpUrl(issues, 'orders.claimBaseUrl', config.orders?.claimBaseUrl)
   validateOptionalStorageEndpoint(issues, 'storage.endpoint', config.storage?.endpoint)
diff --git a/apps/backend/src/middleware/cors.ts b/apps/backend/src/middleware/cors.ts
index 9c817a20..6d5036e3 100644
--- a/apps/backend/src/middleware/cors.ts
+++ b/apps/backend/src/middleware/cors.ts
@@ -24,6 +24,11 @@ export function createCorsMiddleware(
       'Content-Type, Authorization, X-Shop-Token, X-Poll-Token',
     )
     res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, PATCH, DELETE, OPTIONS')
+    // 前端靠这两个响应头同步滑动续期后的到期时间。
+    res.setHeader(
+      'Access-Control-Expose-Headers',
+      'X-Session-Expires-At, X-Session-Absolute-Expires-At',
+    )
     res.setHeader('Access-Control-Max-Age', '86400')
 
     if (req.method === 'OPTIONS') {
diff --git a/apps/backend/src/repositories/admin-session-repo.ts b/apps/backend/src/repositories/admin-session-repo.ts
index 245eade7..5ce4f227 100644
--- a/apps/backend/src/repositories/admin-session-repo.ts
+++ b/apps/backend/src/repositories/admin-session-repo.ts
@@ -60,16 +60,47 @@ export async function getActiveAdminSession(
   return result.rows[0] || null
 }
 
-export async function touchAdminSession(sessionId: string, now: string): Promise<boolean> {
-  const result = await query(
+/** 活跃请求的写入节流：last_seen_at 与滑动过期最多 5 分钟刷新一次。 */
+const ADMIN_SESSION_TOUCH_MIN_INTERVAL = '5 minutes'
+
+/**
+ * 校验会话有效并滑动续期。
+ * 返回续期后的空闲到期时间；会话无效/已过期返回 null。
+ */
+export async function touchAdminSession(input: {
+  sessionId: string
+  now: string
+  idleExpiresAt: string
+  absoluteExpiresAt: string
+}): Promise<string | null> {
+  const result = await query<{ expires_at: string | Date }>(
     `
-      UPDATE admin_sessions
-      SET last_seen_at = $2, updated_at = $2
-      WHERE session_id = $1 AND status = 'active' AND expires_at > $2
+      WITH target AS (
+        SELECT session_id, expires_at
+        FROM admin_sessions
+        WHERE session_id = $1 AND status = 'active' AND expires_at > $2
+      ), touched AS (
+        UPDATE admin_sessions s
+        SET last_seen_at = $2,
+            updated_at = $2,
+            expires_at = LEAST($3::timestamptz, $4::timestamptz)
+        FROM target
+        WHERE s.session_id = target.session_id
+          AND s.last_seen_at < ($2::timestamptz - INTERVAL '${ADMIN_SESSION_TOUCH_MIN_INTERVAL}')
+          AND s.expires_at < LEAST($3::timestamptz, $4::timestamptz)
+        RETURNING s.expires_at
+      )
+      SELECT COALESCE(
+        (SELECT expires_at FROM touched),
+        (SELECT expires_at FROM target)
+      ) AS expires_at
     `,
-    [sessionId, now],
+    [input.sessionId, input.now, input.idleExpiresAt, input.absoluteExpiresAt],
   )
-  return result.rowCount === 1
+  const expiresAt = result.rows[0]?.expires_at
+  if (!expiresAt) return null
+  const parsed = new Date(expiresAt).getTime()
+  return Number.isFinite(parsed) ? new Date(parsed).toISOString() : null
 }
 
 export async function revokeAdminSession(sessionId: string, now: string): Promise<boolean> {
diff --git a/apps/backend/src/repositories/worker-platform/worker-session-repo.ts b/apps/backend/src/repositories/worker-platform/worker-session-repo.ts
index 2177392a..5f5c5927 100644
--- a/apps/backend/src/repositories/worker-platform/worker-session-repo.ts
+++ b/apps/backend/src/repositories/worker-platform/worker-session-repo.ts
@@ -84,40 +84,49 @@ export async function getWorkerSessionBySessionId(
 }
 
 /**
- * 校验会话仍然有效，并顺带刷新 last_seen_at。
+ * 校验会话仍然有效，并滑动续期空闲窗口。
  *
- * 这里必须同时满足两个约束，所以不能用"直接跳过"的写法：
- *   1. 返回值是**鉴权有效性**——上层 `!(await touchWorkerSession(...))` 为真就直接 401
- *      「登录设备已被删除」，跳过查询会把所有正常请求打成未登录；
- *   2. 也不能像以前那样每个请求都真写一次：32 天里 last_seen_at 被写了 3300 万次，
- *      占数据库总执行时间的 2.8%，还在 worker_sessions 上堆出 14% 的死元组。
- *
- * 因此改成「一条语句拿到有效性 + 只在超过 5 分钟没刷新时才写」。
- * 副作用只有 last_seen_at 精度变粗（用于设备列表排序与展示），
- * 不影响会话有效期：expires_at 在建会话时确定，不做滑动续期。
+ * 约束：
+ *   1. 返回值是鉴权有效性——null 表示会话已失效/被删除，上层直接 401；
+ *   2. 写入要节流：32 天里 last_seen_at 被写了 3300 万次，占数据库总执行时间的 2.8%；
+ *   3. 续期后的 expires_at 不得超过 Token 里的绝对上限，绝对上限只能重新登录突破。
  */
 const WORKER_SESSION_TOUCH_MIN_INTERVAL = '5 minutes'
 
-export async function touchWorkerSession(sessionId: string, now: string): Promise<boolean> {
-  const result = await query<{ valid: boolean }>(
+export async function touchWorkerSession(input: {
+  sessionId: string
+  now: string
+  idleExpiresAt: string
+  absoluteExpiresAt: string
+}): Promise<string | null> {
+  const result = await query<{ expires_at: string | Date }>(
     `
       WITH target AS (
-        SELECT session_id
+        SELECT session_id, expires_at
         FROM worker_sessions
         WHERE session_id = $1 AND status = 'active' AND expires_at > $2
       ), touched AS (
         UPDATE worker_sessions ws
-        SET last_seen_at = $2, updated_at = $2
+        SET last_seen_at = $2,
+            updated_at = $2,
+            expires_at = LEAST($3::timestamptz, $4::timestamptz)
         FROM target
         WHERE ws.session_id = target.session_id
           AND ws.last_seen_at < ($2::timestamptz - INTERVAL '${WORKER_SESSION_TOUCH_MIN_INTERVAL}')
-        RETURNING ws.session_id
+          AND ws.expires_at < LEAST($3::timestamptz, $4::timestamptz)
+        RETURNING ws.expires_at
       )
-      SELECT EXISTS (SELECT 1 FROM target) AS valid
+      SELECT COALESCE(
+        (SELECT expires_at FROM touched),
+        (SELECT expires_at FROM target)
+      ) AS expires_at
     `,
-    [String(sessionId || '').trim(), now],
+    [input.sessionId, input.now, input.idleExpiresAt, input.absoluteExpiresAt],
   )
-  return Boolean(result.rows[0]?.valid)
+  const expiresAt = result.rows[0]?.expires_at
+  if (!expiresAt) return null
+  const parsed = new Date(expiresAt).getTime()
+  return Number.isFinite(parsed) ? new Date(parsed).toISOString() : null
 }
 
 export async function revokeWorkerSession(
diff --git a/apps/backend/src/routes/admin/auth.ts b/apps/backend/src/routes/admin/auth.ts
index e268cf29..2b8b675c 100644
--- a/apps/backend/src/routes/admin/auth.ts
+++ b/apps/backend/src/routes/admin/auth.ts
@@ -110,7 +110,7 @@ router.post(
 
 router.get(
   '/auth/session',
-  createJsonHandler((req) => getAdminSessionSummary(extractBearerToken(req)), {
+  createJsonHandler((req, res) => getAdminSessionSummary(extractBearerToken(req), res), {
     successMessage: 'ok',
     errorMessage: '读取后台登录态失败',
     scope: '[admin/auth/session]',
diff --git a/apps/backend/src/routes/admin/session.ts b/apps/backend/src/routes/admin/session.ts
index d907669c..8a473661 100644
--- a/apps/backend/src/routes/admin/session.ts
+++ b/apps/backend/src/routes/admin/session.ts
@@ -5,6 +5,7 @@ import {
 } from '../../services/admin/admin-auth-service.js'
 import { writeAdminAuditLog } from '../../services/admin/admin-audit-service.js'
 import { buildSuccessPayload, createHttpError, sendRouteError } from '../../utils/http.js'
+import { setSessionExpiryHeaders } from '../../utils/session-headers.js'
 import { logWarn } from '../../utils/logger.js'
 import type { AdminSession } from '../../services/admin/admin-auth-service.js'
 
@@ -63,6 +64,7 @@ export async function requireAdminSession(
 ): Promise<void> {
   try {
     req.adminSession = await verifyAdminSessionToken(extractBearerToken(req))
+    setSessionExpiryHeaders(res, req.adminSession)
     next()
   } catch (error) {
     sendRouteError(res, error, '后台鉴权失败', '[admin/auth]')
diff --git a/apps/backend/src/routes/worker/auth-public.ts b/apps/backend/src/routes/worker/auth-public.ts
index 82915b3f..61656194 100644
--- a/apps/backend/src/routes/worker/auth-public.ts
+++ b/apps/backend/src/routes/worker/auth-public.ts
@@ -184,7 +184,7 @@ router.post(
 
 router.get(
   '/auth/session',
-  createRouteHandler((req) => getWorkerSessionSummary(extractWorkerBearerToken(req)), {
+  createRouteHandler((req, res) => getWorkerSessionSummary(extractWorkerBearerToken(req), res), {
     successMessage: 'ok',
     errorMessage: '读取接单登录态失败',
     scope: '[worker/auth/session]',
diff --git a/apps/backend/src/routes/worker/session.ts b/apps/backend/src/routes/worker/session.ts
index c704fcdd..ed534d55 100644
--- a/apps/backend/src/routes/worker/session.ts
+++ b/apps/backend/src/routes/worker/session.ts
@@ -6,6 +6,7 @@ import {
   type WorkerSession,
 } from '../../services/worker-platform/index.js'
 import { createHttpError, sendRouteError } from '../../utils/http.js'
+import { setSessionExpiryHeaders } from '../../utils/session-headers.js'
 
 export async function requireWorkerSession(
   req: Request,
@@ -14,6 +15,7 @@ export async function requireWorkerSession(
 ): Promise<void> {
   try {
     req.workerSession = await verifyWorkerSessionToken(extractWorkerBearerToken(req))
+    setSessionExpiryHeaders(res, req.workerSession)
     next()
   } catch (error) {
     sendRouteError(res, error, '接单端鉴权失败', '[worker/auth]')
diff --git a/apps/backend/src/services/admin/admin-auth-service.ts b/apps/backend/src/services/admin/admin-auth-service.ts
index 680637c4..31404da3 100644
--- a/apps/backend/src/services/admin/admin-auth-service.ts
+++ b/apps/backend/src/services/admin/admin-auth-service.ts
@@ -18,7 +18,12 @@ import {
   revokeAdminSession,
   touchAdminSession,
 } from '../../repositories/admin-session-repo.js'
-import { addHours, nowIso } from '../../utils/time.js'
+import { nowIso } from '../../utils/time.js'
+import {
+  resolveSessionExpiryWindow,
+  resolveSlidingSessionExpiresAt,
+} from '../../utils/session-window.js'
+import { setSessionExpiryHeaders } from '../../utils/session-headers.js'
 import { createHttpError } from '../../utils/http.js'
 import { normalizePage, normalizePageSize } from './admin-query-utils.js'
 import { recordAdminLoginLog } from './admin-login-log-service.js'
@@ -39,6 +44,7 @@ export type AdminSession = {
   displayName: string
   role: AdminRole
   expiresAt: string
+  absoluteExpiresAt: string
   sessionVersion: number
   deviceId: string
   permissions: string[]
@@ -346,8 +352,8 @@ export async function verifyAdminSessionToken(token: unknown): Promise<AdminSess
     })
   }
 
-  const expiresAt = String(payload?.exp || '').trim()
-  if (!expiresAt || Date.parse(expiresAt) <= Date.now()) {
+  const absoluteExpiresAt = String(payload?.exp || '').trim()
+  if (!absoluteExpiresAt || Date.parse(absoluteExpiresAt) <= Date.now()) {
     throw createHttpError('后台登录已过期，请重新登录', {
       statusCode: 401,
       errorCode: 'admin_auth_expired',
@@ -362,14 +368,30 @@ export async function verifyAdminSessionToken(token: unknown): Promise<AdminSess
       errorCode: 'admin_auth_invalid',
     })
   }
-  const activeSession = await getActiveAdminSession(sessionId, nowIso())
+  const now = nowIso()
+  const activeSession = await getActiveAdminSession(sessionId, now)
   if (!activeSession || Number(activeSession.user_id) !== userId) {
     throw createHttpError('后台登录态已失效，请重新登录', {
       statusCode: 401,
       errorCode: 'admin_auth_revoked',
     })
   }
-  await touchAdminSession(sessionId, nowIso())
+  const touchedExpiresAt = await touchAdminSession({
+    sessionId,
+    now,
+    idleExpiresAt: resolveSlidingSessionExpiresAt({
+      now,
+      idleHours: runtimeConfig.admin.sessionIdleTtlHours,
+      absoluteExpiresAt,
+    }),
+    absoluteExpiresAt,
+  })
+  if (!touchedExpiresAt) {
+    throw createHttpError('后台登录态已失效，请重新登录', {
+      statusCode: 401,
+      errorCode: 'admin_auth_revoked',
+    })
+  }
   const user = await getAdminUserById(userId)
   if (!user || user.status !== 'active') {
     throw createHttpError('后台账号已不可用，请重新登录', {
@@ -393,7 +415,8 @@ export async function verifyAdminSessionToken(token: unknown): Promise<AdminSess
     username: String(user.username || ''),
     displayName: String(user.display_name || user.username || ''),
     role: normalizeAdminRole(user.role),
-    expiresAt,
+    expiresAt: touchedExpiresAt,
+    absoluteExpiresAt,
     sessionVersion: currentSessionVersion,
     deviceId: String(activeSession.device_id || ''),
     permissions: await listAdminPermissionKeysForRole(normalizeAdminRole(user.role)),
@@ -406,12 +429,17 @@ export async function logoutAdmin(token: unknown): Promise<{ success: boolean; r
   return { success: true, revoked }
 }
 
-export async function getAdminSessionSummary(token: unknown): Promise<JsonObject> {
+export async function getAdminSessionSummary(
+  token: unknown,
+  res?: { setHeader(name: string, value: string): unknown },
+): Promise<JsonObject> {
   const session = await verifyAdminSessionToken(token)
+  if (res) setSessionExpiryHeaders(res, session)
 
   return {
     authenticated: true,
     expiresAt: session.expiresAt,
+    absoluteExpiresAt: session.absoluteExpiresAt,
     user: {
       userId: session.userId,
       username: session.username,
@@ -738,7 +766,12 @@ export function ensureAdminAuthConfigured(): void {
 
 function createAdminSession(user: AdminUserRow, deviceId = ''): JsonObject {
   const issuedAt = nowIso()
-  const expiresAt = addHours(issuedAt, Number(runtimeConfig.admin.sessionTtlHours || 12))
+  // Token 的 exp 是绝对上限；DB 会话的 expires_at 是空闲窗口，会在每次访问时滑动。
+  const { idleExpiresAt, absoluteExpiresAt } = resolveSessionExpiryWindow({
+    now: issuedAt,
+    idleHours: Number(runtimeConfig.admin.sessionIdleTtlHours || 24),
+    absoluteHours: Number(runtimeConfig.admin.sessionAbsoluteTtlHours || 168),
+  })
   const payload = {
     sid: crypto.randomBytes(12).toString('hex'),
     uid: Number(user.id),
@@ -747,7 +780,7 @@ function createAdminSession(user: AdminUserRow, deviceId = ''): JsonObject {
     dev: String(deviceId || ''),
     ver: normalizeAdminSessionVersion(user.session_version),
     iat: issuedAt,
-    exp: expiresAt,
+    exp: absoluteExpiresAt,
   }
   const encodedPayload = Buffer.from(JSON.stringify(payload)).toString('base64url')
   const signature = signPayload(encodedPayload)
@@ -756,7 +789,8 @@ function createAdminSession(user: AdminUserRow, deviceId = ''): JsonObject {
     sessionId: payload.sid,
     issuedAt,
     token: `${encodedPayload}.${signature}`,
-    expiresAt,
+    expiresAt: idleExpiresAt,
+    absoluteExpiresAt,
     user: {
       userId: Number(user.id),
       username: String(user.username || ''),
diff --git a/apps/backend/src/services/worker-platform/worker-auth-utils.ts b/apps/backend/src/services/worker-platform/worker-auth-utils.ts
index 96951879..6ed3131a 100644
--- a/apps/backend/src/services/worker-platform/worker-auth-utils.ts
+++ b/apps/backend/src/services/worker-platform/worker-auth-utils.ts
@@ -3,12 +3,18 @@ import crypto from 'node:crypto'
 import { runtimeConfig } from '../../config/runtime.js'
 import type { WorkerUserRow } from '../../repositories/worker-platform/index.js'
 import { createHttpError } from '../../utils/http.js'
-import { addHours, nowIso } from '../../utils/time.js'
+import { nowIso } from '../../utils/time.js'
+import { resolveSessionExpiryWindow } from '../../utils/session-window.js'
 import { normalizeSessionVersion } from './worker-normalizers.js'
 
 export function createWorkerSessionToken(worker: WorkerUserRow) {
   const issuedAt = nowIso()
-  const expiresAt = addHours(issuedAt, Number(runtimeConfig.admin?.sessionTtlHours || 12))
+  // Token 的 exp 是绝对上限；DB 会话的 expires_at 是空闲窗口，会在每次访问时滑动。
+  const { idleExpiresAt, absoluteExpiresAt } = resolveSessionExpiryWindow({
+    now: issuedAt,
+    idleHours: Number(runtimeConfig.worker?.sessionIdleTtlHours || 168),
+    absoluteHours: Number(runtimeConfig.worker?.sessionAbsoluteTtlHours || 720),
+  })
   const payload = {
     typ: 'worker',
     sid: crypto.randomBytes(12).toString('hex'),
@@ -17,13 +23,14 @@ export function createWorkerSessionToken(worker: WorkerUserRow) {
     status: worker.status,
     ver: normalizeSessionVersion(worker.session_version),
     iat: issuedAt,
-    exp: expiresAt,
+    exp: absoluteExpiresAt,
   }
   const encodedPayload = Buffer.from(JSON.stringify(payload)).toString('base64url')
   return {
     sessionId: payload.sid,
     token: `${encodedPayload}.${signWorkerPayload(encodedPayload)}`,
-    expiresAt,
+    expiresAt: idleExpiresAt,
+    absoluteExpiresAt,
   }
 }
 
diff --git a/apps/backend/src/services/worker-platform/worker-login-service.ts b/apps/backend/src/services/worker-platform/worker-login-service.ts
index 36ec08fd..b8fdaa86 100644
--- a/apps/backend/src/services/worker-platform/worker-login-service.ts
+++ b/apps/backend/src/services/worker-platform/worker-login-service.ts
@@ -186,6 +186,7 @@ function createCredentialSession(worker: WorkerUserRow): WorkerSession {
     username: worker.username,
     status: worker.status,
     expiresAt: '',
+    absoluteExpiresAt: '',
     sessionVersion: normalizeSessionVersion(worker.session_version),
   }
 }
diff --git a/apps/backend/src/services/worker-platform/worker-platform-service.test.ts b/apps/backend/src/services/worker-platform/worker-platform-service.test.ts
index b64880f3..7c598e81 100644
--- a/apps/backend/src/services/worker-platform/worker-platform-service.test.ts
+++ b/apps/backend/src/services/worker-platform/worker-platform-service.test.ts
@@ -2828,8 +2828,12 @@ test('会话 touch 必须同时保留鉴权语义与写入节流', async () => {
     src.indexOf('export async function touchWorkerSession'),
     src.indexOf('export async function revokeWorkerSession'),
   )
-  // 返回值是鉴权有效性：上层 !(await touch) 会直接 401，不能因为"不写"就返回 false
-  assert.ok(body.includes('EXISTS (SELECT 1 FROM target) AS valid'), '必须仍然返回会话是否有效')
+  // 返回值是续期后的空闲到期时间：null 才会被上层判成 401
+  assert.ok(body.includes('RETURNING ws.expires_at'), '必须返回滑动续期后的 expires_at')
+  assert.ok(
+    body.includes('LEAST($3::timestamptz, $4::timestamptz)'),
+    '滑动续期不能突破 Token 里的绝对上限',
+  )
   assert.ok(body.includes("status = 'active'"), '有效性判定不能丢')
   // 写操作必须节流：32 天里被写了 3300 万次
   assert.ok(body.includes('WORKER_SESSION_TOUCH_MIN_INTERVAL'), '缺少节流间隔常量')
diff --git a/apps/backend/src/services/worker-platform/worker-session-auth-service.ts b/apps/backend/src/services/worker-platform/worker-session-auth-service.ts
index fbbb5f44..198b3adb 100644
--- a/apps/backend/src/services/worker-platform/worker-session-auth-service.ts
+++ b/apps/backend/src/services/worker-platform/worker-session-auth-service.ts
@@ -5,9 +5,12 @@ import {
   revokeWorkerSession,
   touchWorkerSession,
 } from '../../repositories/worker-platform/index.js'
+import { runtimeConfig } from '../../config/runtime.js'
 import type { JsonObject } from '../../types/json.js'
 import { createHttpError } from '../../utils/http.js'
 import { nowIso } from '../../utils/time.js'
+import { resolveSlidingSessionExpiresAt } from '../../utils/session-window.js'
+import { setSessionExpiryHeaders } from '../../utils/session-headers.js'
 import {
   ensureWorkerAuthConfigured,
   isIgnorableWorkerAuthError,
@@ -102,8 +105,8 @@ export async function verifyWorkerSessionToken(token: unknown): Promise<WorkerSe
     })
   }
 
-  const expiresAt = String(payload.exp || '').trim()
-  if (!expiresAt || Date.parse(expiresAt) <= Date.now()) {
+  const absoluteExpiresAt = String(payload.exp || '').trim()
+  if (!absoluteExpiresAt || Date.parse(absoluteExpiresAt) <= Date.now()) {
     throw createHttpError('登录已过期，请重新登录', {
       statusCode: 401,
       errorCode: 'worker_auth_expired',
@@ -133,8 +136,7 @@ export async function verifyWorkerSessionToken(token: unknown): Promise<WorkerSe
     !sessionRecord ||
     Number(sessionRecord.worker_id) !== Number(worker.id) ||
     sessionRecord.status !== 'active' ||
-    Date.parse(String(sessionRecord.expires_at || '')) <= Date.now() ||
-    !(await touchWorkerSession(sessionId, nowIso()))
+    Date.parse(String(sessionRecord.expires_at || '')) <= Date.now()
   ) {
     throw createHttpError('登录设备已被删除，请重新登录', {
       statusCode: 401,
@@ -142,12 +144,31 @@ export async function verifyWorkerSessionToken(token: unknown): Promise<WorkerSe
     })
   }
 
+  const nowAt = nowIso()
+  const touchedExpiresAt = await touchWorkerSession({
+    sessionId,
+    now: nowAt,
+    idleExpiresAt: resolveSlidingSessionExpiresAt({
+      now: nowAt,
+      idleHours: runtimeConfig.worker?.sessionIdleTtlHours || 168,
+      absoluteExpiresAt,
+    }),
+    absoluteExpiresAt,
+  })
+  if (!touchedExpiresAt) {
+    throw createHttpError('登录设备已被删除，请重新登录', {
+      statusCode: 401,
+      errorCode: 'worker_auth_device_revoked',
+    })
+  }
+
   const verifiedSession: WorkerSession = {
     sessionId,
     workerId: Number(worker.id),
     username: worker.username,
     status: worker.status,
-    expiresAt,
+    expiresAt: touchedExpiresAt,
+    absoluteExpiresAt,
     sessionVersion: currentSessionVersion,
   }
 
@@ -200,12 +221,17 @@ export async function deleteWorkerSession(session: WorkerSession, targetSessionI
   }
 }
 
-export async function getWorkerSessionSummary(token: unknown) {
+export async function getWorkerSessionSummary(
+  token: unknown,
+  res?: { setHeader(name: string, value: string): unknown },
+) {
   const session = await verifyWorkerSessionToken(token)
+  if (res) setSessionExpiryHeaders(res, session)
   const worker = await getRequiredWorker(session.workerId)
   return {
     authenticated: true,
     expiresAt: session.expiresAt,
+    absoluteExpiresAt: session.absoluteExpiresAt,
     worker: mapWorkerUser(worker),
   }
 }
diff --git a/apps/backend/src/services/worker-platform/worker-session-context-service.ts b/apps/backend/src/services/worker-platform/worker-session-context-service.ts
index f925543a..4d1a9299 100644
--- a/apps/backend/src/services/worker-platform/worker-session-context-service.ts
+++ b/apps/backend/src/services/worker-platform/worker-session-context-service.ts
@@ -12,6 +12,7 @@ export type WorkerSession = {
   username: string
   status: string
   expiresAt: string
+  absoluteExpiresAt: string
   sessionVersion: number
 }
 
diff --git a/apps/backend/src/types/runtime-config.ts b/apps/backend/src/types/runtime-config.ts
index 6eed50dc..eea078e3 100644
--- a/apps/backend/src/types/runtime-config.ts
+++ b/apps/backend/src/types/runtime-config.ts
@@ -67,7 +67,10 @@ export type RuntimeConfig = {
   }
   admin: {
     sessionSecret: string
-    sessionTtlHours: number
+    /** 后台空闲多久未访问即失效（每次访问滑动续期）。 */
+    sessionIdleTtlHours: number
+    /** 后台会话从登录起算的绝对上限，滑动续期不能突破。 */
+    sessionAbsoluteTtlHours: number
     defaultUsers: AdminDefaultUser[]
   }
   platforms: {
@@ -117,6 +120,10 @@ export type RuntimeConfig = {
     }
     /** 打手端订单详情是否展示流转记录（默认关闭，仅后台可见） */
     orderTimelineVisible: boolean
+    /** 打手空闲多久未访问即失效（每次访问滑动续期）。 */
+    sessionIdleTtlHours: number
+    /** 打手会话从登录起算的绝对上限，滑动续期不能突破。 */
+    sessionAbsoluteTtlHours: number
   }
   cors: {
     allowedOrigins: string[]
diff --git a/apps/backend/src/utils/session-headers.ts b/apps/backend/src/utils/session-headers.ts
new file mode 100644
index 00000000..fbc5326e
--- /dev/null
+++ b/apps/backend/src/utils/session-headers.ts
@@ -0,0 +1,21 @@
+type HeaderWriter = {
+  setHeader(name: string, value: string): unknown
+}
+
+type SessionExpiryLike = {
+  expiresAt?: string | null
+  absoluteExpiresAt?: string | null
+}
+
+/**
+ * 把滑动续期后的空闲到期时间回传给前端。
+ * Token 本身不重签（exp 是绝对上限），前端只更新本地空闲计时器。
+ */
+export function setSessionExpiryHeaders(res: HeaderWriter, session: SessionExpiryLike): void {
+  if (session.expiresAt) {
+    res.setHeader('X-Session-Expires-At', session.expiresAt)
+  }
+  if (session.absoluteExpiresAt) {
+    res.setHeader('X-Session-Absolute-Expires-At', session.absoluteExpiresAt)
+  }
+}
diff --git a/apps/backend/src/utils/session-window.test.ts b/apps/backend/src/utils/session-window.test.ts
new file mode 100644
index 00000000..5df1059f
--- /dev/null
+++ b/apps/backend/src/utils/session-window.test.ts
@@ -0,0 +1,82 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { resolveSessionExpiryWindow, resolveSlidingSessionExpiresAt } from './session-window.js'
+import { setSessionExpiryHeaders } from './session-headers.js'
+
+test('登录时同时给出空闲到期与绝对到期（后台 24h / 7d）', () => {
+  const window = resolveSessionExpiryWindow({
+    now: '2026-10-25T00:00:00.000Z',
+    idleHours: 24,
+    absoluteHours: 168,
+  })
+  assert.equal(window.idleExpiresAt, '2026-10-26T00:00:00.000Z')
+  assert.equal(window.absoluteExpiresAt, '2026-11-01T00:00:00.000Z')
+})
+
+test('登录时同时给出空闲到期与绝对到期（打手 7d / 30d）', () => {
+  const window = resolveSessionExpiryWindow({
+    now: '2026-10-25T00:00:00.000Z',
+    idleHours: 168,
+    absoluteHours: 720,
+  })
+  assert.equal(window.idleExpiresAt, '2026-11-01T00:00:00.000Z')
+  assert.equal(window.absoluteExpiresAt, '2026-11-24T00:00:00.000Z')
+})
+
+test('绝对上限小于空闲窗口时以绝对上限为准', () => {
+  const window = resolveSessionExpiryWindow({
+    now: '2026-10-25T00:00:00.000Z',
+    idleHours: 24,
+    absoluteHours: 12,
+  })
+  assert.equal(window.idleExpiresAt, '2026-10-25T12:00:00.000Z')
+  assert.equal(window.absoluteExpiresAt, '2026-10-25T12:00:00.000Z')
+})
+
+test('滑动续期目标不得超过绝对上限', () => {
+  assert.equal(
+    resolveSlidingSessionExpiresAt({
+      now: '2026-10-25T00:00:00.000Z',
+      idleHours: 24,
+      absoluteExpiresAt: '2026-11-01T00:00:00.000Z',
+    }),
+    '2026-10-26T00:00:00.000Z',
+  )
+  assert.equal(
+    resolveSlidingSessionExpiresAt({
+      now: '2026-10-31T18:00:00.000Z',
+      idleHours: 24,
+      absoluteExpiresAt: '2026-11-01T00:00:00.000Z',
+    }),
+    '2026-11-01T00:00:00.000Z',
+  )
+})
+
+test('绝对上限缺失或非法时仍返回 now + 空闲窗口', () => {
+  assert.equal(
+    resolveSlidingSessionExpiresAt({
+      now: '2026-10-25T00:00:00.000Z',
+      idleHours: 24,
+      absoluteExpiresAt: 'invalid',
+    }),
+    '2026-10-26T00:00:00.000Z',
+  )
+})
+
+test('会话续期响应头同时回传空闲到期与绝对到期', () => {
+  const headers = new Map<string, string>()
+  setSessionExpiryHeaders(
+    {
+      setHeader(name, value) {
+        headers.set(name, value)
+      },
+    },
+    {
+      expiresAt: '2026-10-26T00:00:00.000Z',
+      absoluteExpiresAt: '2026-11-01T00:00:00.000Z',
+    },
+  )
+  assert.equal(headers.get('X-Session-Expires-At'), '2026-10-26T00:00:00.000Z')
+  assert.equal(headers.get('X-Session-Absolute-Expires-At'), '2026-11-01T00:00:00.000Z')
+})
diff --git a/apps/backend/src/utils/session-window.ts b/apps/backend/src/utils/session-window.ts
new file mode 100644
index 00000000..73af721c
--- /dev/null
+++ b/apps/backend/src/utils/session-window.ts
@@ -0,0 +1,41 @@
+import { addHours } from './time.js'
+
+export type SessionExpiryWindow = {
+  /** 空闲窗口：每次访问可滑动续期到的目标时间。 */
+  idleExpiresAt: string
+  /** 绝对上限：从登录起算，任何续期都不能突破。 */
+  absoluteExpiresAt: string
+}
+
+function normalizeHours(value: unknown, fallback: number): number {
+  const parsed = Number(value)
+  return Number.isFinite(parsed) && parsed >= 1 ? Math.floor(parsed) : fallback
+}
+
+/** 登录时计算空闲到期与绝对到期；绝对上限小于空闲窗口时以绝对上限为准。 */
+export function resolveSessionExpiryWindow(input: {
+  now: string
+  idleHours: number
+  absoluteHours: number
+}): SessionExpiryWindow {
+  const requestedIdleHours = normalizeHours(input.idleHours, 24)
+  const absoluteHours = normalizeHours(input.absoluteHours, requestedIdleHours)
+  const idleHours = Math.min(requestedIdleHours, absoluteHours)
+  return {
+    idleExpiresAt: addHours(input.now, idleHours),
+    absoluteExpiresAt: addHours(input.now, absoluteHours),
+  }
+}
+
+/** 滑动续期目标：now + 空闲窗口，但不得超过 Token 里的绝对上限。 */
+export function resolveSlidingSessionExpiresAt(input: {
+  now: string
+  idleHours: number
+  absoluteExpiresAt: string
+}): string {
+  const idleHours = normalizeHours(input.idleHours, 24)
+  const target = addHours(input.now, idleHours)
+  const absoluteMs = Date.parse(String(input.absoluteExpiresAt || ''))
+  if (!Number.isFinite(absoluteMs)) return target
+  return Date.parse(target) <= absoluteMs ? target : new Date(absoluteMs).toISOString()
+}
diff --git a/apps/frontend/src/layouts/AdminLayout.tsx b/apps/frontend/src/layouts/AdminLayout.tsx
index babc4e64..4023c302 100644
--- a/apps/frontend/src/layouts/AdminLayout.tsx
+++ b/apps/frontend/src/layouts/AdminLayout.tsx
@@ -46,11 +46,14 @@ import {
 } from '@/services/admin'
 import {
   clearAdminSession,
+  expireAdminSession,
   getAdminDisplayName,
   getAdminRole,
+  getAdminSessionExpiryDelay,
   getAdminToken,
   getAdminTokenExpiresAt,
   getAdminUsername,
+  isAdminSessionStorageKey,
   setAdminDisplayName,
   setAdminPermissions,
 } from '@/utils/admin-auth'
@@ -77,7 +80,7 @@ export default function AdminLayout() {
   )
   const role = getAdminRole()
   const username = getAdminUsername() || 'admin'
-  const expiresAt = getAdminTokenExpiresAt()
+  const [expiresAt, setExpiresAt] = useState(() => getAdminTokenExpiresAt())
   const [soundEnabled, setSoundEnabled] = useState(
     () => window.localStorage.getItem(NOTIFICATION_SOUND_KEY) === '1',
   )
@@ -96,6 +99,43 @@ export default function AdminLayout() {
     }
   }, [adminSessionQuery.data])
 
+  useEffect(() => {
+    const navigateToLogin = () => {
+      if (!window.location.hash.startsWith('#/admin/login')) {
+        void navigate('/admin/login', { replace: true })
+      }
+    }
+    const handleSessionExpired = () => navigateToLogin()
+    const handleSessionRenewed = () => setExpiresAt(getAdminTokenExpiresAt())
+    const handleStorage = (event: StorageEvent) => {
+      if (!isAdminSessionStorageKey(event.key)) return
+      if (event.newValue === null) {
+        expireAdminSession()
+        navigateToLogin()
+        return
+      }
+      handleSessionRenewed()
+    }
+
+    window.addEventListener('admin-session-expired', handleSessionExpired)
+    window.addEventListener('admin-session-renewed', handleSessionRenewed)
+    window.addEventListener('storage', handleStorage)
+    return () => {
+      window.removeEventListener('admin-session-expired', handleSessionExpired)
+      window.removeEventListener('admin-session-renewed', handleSessionRenewed)
+      window.removeEventListener('storage', handleStorage)
+    }
+  }, [navigate])
+
+  useEffect(() => {
+    const delay = getAdminSessionExpiryDelay(expiresAt)
+    if (delay === null) return
+    const timer = window.setTimeout(() => {
+      expireAdminSession()
+    }, delay)
+    return () => window.clearTimeout(timer)
+  }, [expiresAt])
+
   const displayName =
     adminSessionQuery.data?.data.user?.displayName || getAdminDisplayName() || username
 
@@ -121,7 +161,7 @@ export default function AdminLayout() {
     onEvent: (event) => applyAdminRealtimeEvent(event, queryClient),
     // 会话过期时清登录态回登录页，避免 SSE 带着失效 token 无限重连刷 401。
     onAuthExpired: () => {
-      clearAdminSession()
+      expireAdminSession()
       void navigate('/admin/login', { replace: true, state: { from: location } })
     },
   })
diff --git a/apps/frontend/src/layouts/WorkerLayout.tsx b/apps/frontend/src/layouts/WorkerLayout.tsx
index 68658ec5..8e1c9649 100644
--- a/apps/frontend/src/layouts/WorkerLayout.tsx
+++ b/apps/frontend/src/layouts/WorkerLayout.tsx
@@ -9,7 +9,7 @@ import {
 import { App, Button, Layout, Menu, Typography } from 'antd'
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import type { MenuProps } from 'antd'
-import { useEffect, useMemo } from 'react'
+import { useEffect, useMemo, useState } from 'react'
 import { Outlet, useLocation, useNavigate } from 'react-router'
 
 import { fetchWorkerAfterSalesCases, fetchWorkerProfile, logoutWorker } from '@/services/worker'
@@ -29,6 +29,7 @@ import {
   getWorkerToken,
   getWorkerTokenExpiresAt,
   getWorkerUsername,
+  isWorkerSessionExpiryKey,
   isWorkerSessionStorageKey,
 } from '@/utils/worker-auth'
 import { useRealtimeEvents, type RealtimeEvent } from '@/hooks/useRealtimeEvents'
@@ -100,6 +101,8 @@ export default function WorkerLayout() {
     [afterSalesPendingCount],
   )
 
+  const [sessionExpiresAt, setSessionExpiresAt] = useState(() => getWorkerTokenExpiresAt())
+
   useEffect(() => {
     const navigateToLogin = () => {
       if (window.location.pathname !== '/') {
@@ -107,30 +110,38 @@ export default function WorkerLayout() {
       }
     }
     const handleSessionExpired = () => navigateToLogin()
+    const handleSessionRenewed = () => setSessionExpiresAt(getWorkerTokenExpiresAt())
     const handleStorage = (event: StorageEvent) => {
-      if (isWorkerSessionStorageKey(event.key) && event.newValue === null) {
+      if (!isWorkerSessionStorageKey(event.key)) return
+      if (event.newValue === null) {
         expireWorkerSession()
         navigateToLogin()
+        return
+      }
+      if (isWorkerSessionExpiryKey(event.key)) {
+        handleSessionRenewed()
       }
     }
 
     window.addEventListener('worker-session-expired', handleSessionExpired)
+    window.addEventListener('worker-session-renewed', handleSessionRenewed)
     window.addEventListener('storage', handleStorage)
     return () => {
       window.removeEventListener('worker-session-expired', handleSessionExpired)
+      window.removeEventListener('worker-session-renewed', handleSessionRenewed)
       window.removeEventListener('storage', handleStorage)
     }
   }, [navigate])
 
   useEffect(() => {
-    const delay = getWorkerSessionExpiryDelay(getWorkerTokenExpiresAt())
+    const delay = getWorkerSessionExpiryDelay(sessionExpiresAt)
     if (delay === null) return
 
     const timer = window.setTimeout(() => {
       expireWorkerSession()
     }, delay)
     return () => window.clearTimeout(timer)
-  }, [])
+  }, [sessionExpiresAt])
 
   useRealtimeEvents({
     url: '/api/v1/worker/realtime',
diff --git a/apps/frontend/src/lib/http.ts b/apps/frontend/src/lib/http.ts
index d7c259f0..8998194e 100644
--- a/apps/frontend/src/lib/http.ts
+++ b/apps/frontend/src/lib/http.ts
@@ -1,7 +1,7 @@
 import axios from 'axios'
-import { clearAdminSession, getAdminToken } from '@/utils/admin-auth'
+import { expireAdminSession, getAdminToken, setAdminSessionExpiresAt } from '@/utils/admin-auth'
 import { isWorkerSite } from '@/utils/site'
-import { expireWorkerSession, getWorkerToken } from '@/utils/worker-auth'
+import { expireWorkerSession, getWorkerToken, setWorkerSessionExpiresAt } from '@/utils/worker-auth'
 
 export interface ApiEnvelope<T> {
   code: number
@@ -20,6 +20,7 @@ const http = axios.create({
 
 http.interceptors.response.use(
   (response) => {
+    applySessionExpiryHeaders(response)
     const data = response.data as ApiEnvelope<unknown>
 
     // Business-level error: HTTP 200 but code !== 0
@@ -36,6 +37,7 @@ http.interceptors.response.use(
     return response.data
   },
   (error) => {
+    applySessionExpiryHeaders(error?.response)
     const responseMessage =
       typeof error?.response?.data?.msg === 'string' ? error.response.data.msg.trim() : ''
     const fallbackMessage = resolveFallbackHttpMessage(error)
@@ -57,7 +59,7 @@ http.interceptors.response.use(
       const errorCode = String(error?.response?.data?.errorCode || '').trim()
 
       if (status === 401 && shouldClearAdminSession(errorCode)) {
-        clearAdminSession()
+        expireAdminSession()
 
         if (
           window.location.hash.startsWith('#/admin') &&
@@ -105,6 +107,37 @@ http.interceptors.request.use((config) => {
   return config
 })
 
+/**
+ * 服务端每次校验会话都会回传滑动续期后的空闲到期时间；
+ * 这里同步到 localStorage，WorkerLayout / AdminLayout 的定时器会自动重排。
+ */
+function applySessionExpiryHeaders(
+  response:
+    | {
+        config?: { url?: string }
+        headers?: Record<string, unknown> & { get?: (name: string) => unknown }
+      }
+    | undefined,
+) {
+  if (!response) return
+  const url = String(response.config?.url || '')
+  if (!url.startsWith('/api/v1/admin') && !url.startsWith('/api/v1/worker')) return
+
+  const headers = response.headers
+  const raw =
+    typeof headers?.get === 'function'
+      ? headers.get('x-session-expires-at')
+      : headers?.['x-session-expires-at']
+  const expiresAt = String(raw || '').trim()
+  if (!expiresAt) return
+
+  if (url.startsWith('/api/v1/admin')) {
+    setAdminSessionExpiresAt(expiresAt)
+  } else {
+    setWorkerSessionExpiresAt(expiresAt)
+  }
+}
+
 function resolveFallbackHttpMessage(error: unknown) {
   const message = String((error as { message?: string })?.message ?? '')
 
diff --git a/apps/frontend/src/services/worker.ts b/apps/frontend/src/services/worker.ts
index 4a77183e..338a2f6a 100644
--- a/apps/frontend/src/services/worker.ts
+++ b/apps/frontend/src/services/worker.ts
@@ -127,6 +127,7 @@ export function fetchWorkerSession() {
   return apiGet<{
     authenticated: boolean
     expiresAt: string
+    absoluteExpiresAt?: string
     worker: WorkerUser
   }>('/api/v1/worker/auth/session')
 }
diff --git a/apps/frontend/src/types/admin/auth.ts b/apps/frontend/src/types/admin/auth.ts
index 0bda82f9..e2f375e3 100644
--- a/apps/frontend/src/types/admin/auth.ts
+++ b/apps/frontend/src/types/admin/auth.ts
@@ -4,6 +4,7 @@ export type AdminUserStatus = 'active' | 'disabled'
 export interface AdminLoginResponse {
   token: string
   expiresAt: string
+  absoluteExpiresAt?: string
   user: {
     userId: number
     username: string
@@ -41,6 +42,7 @@ export interface AdminDeviceStatusResponse {
 export interface AdminSessionSummary {
   authenticated: boolean
   expiresAt: string
+  absoluteExpiresAt?: string
   user: {
     userId: number
     username: string
diff --git a/apps/frontend/src/types/worker-platform.ts b/apps/frontend/src/types/worker-platform.ts
index 8d70feb1..9b6a7eb9 100644
--- a/apps/frontend/src/types/worker-platform.ts
+++ b/apps/frontend/src/types/worker-platform.ts
@@ -721,6 +721,7 @@ export type Pagination = {
 export type WorkerLoginResponse = {
   token: string
   expiresAt: string
+  absoluteExpiresAt?: string
   worker: WorkerUser
   passwordWeak?: boolean
 }
diff --git a/apps/frontend/src/utils/admin-auth.ts b/apps/frontend/src/utils/admin-auth.ts
index 1b14e44e..1a54832f 100644
--- a/apps/frontend/src/utils/admin-auth.ts
+++ b/apps/frontend/src/utils/admin-auth.ts
@@ -6,6 +6,16 @@ const ADMIN_DISPLAY_NAME_KEY = 'order-site-admin-display-name'
 const ADMIN_ROLE_KEY = 'order-site-admin-role'
 const ADMIN_PERMISSIONS_KEY = 'order-site-admin-permissions'
 
+const ADMIN_SESSION_STORAGE_KEYS = new Set([
+  ADMIN_TOKEN_KEY,
+  ADMIN_EXPIRES_AT_KEY,
+  ADMIN_USER_ID_KEY,
+  ADMIN_USERNAME_KEY,
+  ADMIN_DISPLAY_NAME_KEY,
+  ADMIN_ROLE_KEY,
+  ADMIN_PERMISSIONS_KEY,
+])
+
 const ADMIN_ROLE_LEVEL: Record<'support' | 'operator' | 'admin' | 'finance', number> = {
   support: 1,
   operator: 2,
@@ -143,6 +153,37 @@ export function clearAdminSession() {
   localStorage.removeItem(ADMIN_PERMISSIONS_KEY)
 }
 
+/** 滑动续期：只更新本地空闲到期时间，Token 本身不重签（exp 是绝对上限）。 */
+export function setAdminSessionExpiresAt(expiresAt: string) {
+  const normalized = String(expiresAt || '').trim()
+  if (!normalized || normalized === getAdminTokenExpiresAt()) return
+  localStorage.setItem(ADMIN_EXPIRES_AT_KEY, normalized)
+  if (typeof window !== 'undefined') {
+    window.dispatchEvent(new Event('admin-session-renewed'))
+  }
+}
+
+/** 清理失效会话并通知当前标签页，避免并发请求各自重复跳转。 */
+export function expireAdminSession() {
+  const hadSession = Boolean(getAdminToken() || getAdminTokenExpiresAt())
+  clearAdminSession()
+  if (hadSession && typeof window !== 'undefined') {
+    window.dispatchEvent(new Event('admin-session-expired'))
+  }
+  return hadSession
+}
+
+export function isAdminSessionStorageKey(key: string | null) {
+  return Boolean(key && ADMIN_SESSION_STORAGE_KEYS.has(key))
+}
+
+export function getAdminSessionExpiryDelay(expiresAt: string, now = Date.now()) {
+  if (!expiresAt) return null
+  const expiresAtMs = Date.parse(expiresAt)
+  if (!Number.isFinite(expiresAtMs)) return null
+  return Math.max(0, expiresAtMs - now)
+}
+
 export function hasAdminSession() {
   const token = getAdminToken()
   const expiresAt = getAdminTokenExpiresAt()
diff --git a/apps/frontend/src/utils/worker-auth.ts b/apps/frontend/src/utils/worker-auth.ts
index f9b2cae0..d3782bb3 100644
--- a/apps/frontend/src/utils/worker-auth.ts
+++ b/apps/frontend/src/utils/worker-auth.ts
@@ -73,6 +73,16 @@ export function clearWorkerSession() {
   localStorage.removeItem(WORKER_STATUS_KEY)
 }
 
+/** 滑动续期：只更新本地空闲到期时间，Token 本身不重签（exp 是绝对上限）。 */
+export function setWorkerSessionExpiresAt(expiresAt: string) {
+  const normalized = String(expiresAt || '').trim()
+  if (!normalized || normalized === getWorkerTokenExpiresAt()) return
+  localStorage.setItem(WORKER_EXPIRES_AT_KEY, normalized)
+  if (typeof window !== 'undefined') {
+    window.dispatchEvent(new Event('worker-session-renewed'))
+  }
+}
+
 /** 清理失效会话并通知当前标签页，避免并发请求各自重复跳转。 */
 export function expireWorkerSession() {
   const hadSession = Boolean(getWorkerToken() || getWorkerTokenExpiresAt())
@@ -87,6 +97,10 @@ export function isWorkerSessionStorageKey(key: string | null) {
   return Boolean(key && WORKER_SESSION_STORAGE_KEYS.has(key))
 }
 
+export function isWorkerSessionExpiryKey(key: string | null) {
+  return key === WORKER_EXPIRES_AT_KEY
+}
+
 export function getWorkerSessionExpiryDelay(expiresAt: string, now = Date.now()) {
   if (!expiresAt) return null
   const expiresAtMs = Date.parse(expiresAt)