diff --git a/app/public/sw.js b/app/public/sw.js
index f3b0cf2..85faec5 100644
--- a/app/public/sw.js
+++ b/app/public/sw.js
@@ -1,9 +1,9 @@
-// PWA Service Worker v2
-// - 页面导航：网络优先（构建更新后强制拿到新 index.html），离线才回落缓存
-// - 静态资源：缓存优先
-// - /api：直连不缓存
-const CACHE = 'fp-static-v2';
-const CORE = ['/', '/manifest.webmanifest', '/icons/pwa-192.png', '/icons/pwa-512.png'];
+// PWA Service Worker v3
+// - /api /auth /admin /sync 一律直连，绝不缓存（修复切换账号后 /auth/me 命中旧缓存的问题）
+// - 仅指纹化静态资源（/assets/、/icons/）缓存优先
+// - 页面导航网络优先，离线回落缓存的 index.html
+const CACHE = 'fp-static-v3';
+const CORE = ['/manifest.webmanifest', '/icons/pwa-192.png', '/icons/pwa-512.png'];
 
 self.addEventListener('install', (e) => {
   self.skipWaiting();
@@ -20,8 +20,25 @@ self.addEventListener('activate', (e) => {
 
 self.addEventListener('fetch', (e) => {
   const url = new URL(e.request.url);
-  if (e.request.method !== 'GET' || url.pathname.startsWith('/api')) return;
+  if (e.request.method !== 'GET') return;
+  // 后端接口直连（含 /api /auth /admin /sync），绝不缓存
+  if (/^\/(api|auth|admin|sync)(\/|$)/.test(url.pathname)) return;
 
+  // 指纹化静态资源：缓存优先（内容不可变）
+  if (url.pathname.startsWith('/assets/') || url.pathname.startsWith('/icons/')) {
+    e.respondWith(
+      caches.match(e.request).then((hit) => hit || fetch(e.request).then((res) => {
+        if (res.ok && url.origin === location.origin) {
+          const copy = res.clone();
+          caches.open(CACHE).then((c) => c.put(e.request, copy));
+        }
+        return res;
+      }))
+    );
+    return;
+  }
+
+  // 页面导航：网络优先，离线回落
   if (e.request.mode === 'navigate') {
     e.respondWith(
       fetch(e.request).then((res) => {
@@ -32,14 +49,5 @@ self.addEventListener('fetch', (e) => {
     );
     return;
   }
-
-  e.respondWith(
-    caches.match(e.request).then((hit) => hit || fetch(e.request).then((res) => {
-      if (res.ok && url.origin === location.origin) {
-        const copy = res.clone();
-        caches.open(CACHE).then((c) => c.put(e.request, copy));
-      }
-      return res;
-    }))
-  );
+  // 其余（manifest 等）：网络直连
 });
diff --git a/sync-server/src/db.mjs b/sync-server/src/db.mjs
index 89dbb9d..ae687fc 100644
--- a/sync-server/src/db.mjs
+++ b/sync-server/src/db.mjs
@@ -93,6 +93,8 @@ CREATE TABLE IF NOT EXISTS attachments (
     used_at TEXT,
     valid INTEGER NOT NULL DEFAULT 1
   );`);
+  const hasRemark = db.prepare("SELECT COUNT(*) AS c FROM pragma_table_info('invite_codes') WHERE name='remark'").get().c;
+  if (Number(hasRemark) === 0) db.exec("ALTER TABLE invite_codes ADD COLUMN remark TEXT;");
   return db;
 }