diff --git a/app/layout.tsx b/app/layout.tsx
index 207d5184c..853ec3208 100644
--- a/app/layout.tsx
+++ b/app/layout.tsx
@@ -13,7 +13,7 @@ export async function generateMetadata(): Promise<Metadata> {
   const updatedAt =
     "updatedAt" in settings && settings.updatedAt
       ? new Date(settings.updatedAt).getTime()
-      : Date.now();
+      : "default";
   const faviconUrl = `/api/favicon?v=${updatedAt}`;
   const metadataBase = process.env.AUTH_URL
     ? new URL(process.env.AUTH_URL)
diff --git a/proxy.ts b/proxy.ts
index 8c2f055b5..2ce34ea38 100644
--- a/proxy.ts
+++ b/proxy.ts
@@ -11,15 +11,19 @@ import { isSuspiciousRequest, logSuspiciousRequest } from "@/lib/security/reques
 function isHighFrequencyReadApi(pathname: string, method: string) {
   if (method !== "GET") return false;
   if (/^\/api\/canvas\/[^/]+\/detail-archives$/.test(pathname)) return true;
+  if (/^\/api\/canvas\/[^/]+$/.test(pathname)) return true;
 
   return [
     "/api/models",
     "/api/canvas",
+    "/api/canvas-skill-tags",
     "/api/nav-links",
     "/api/site-settings",
     "/api/messages",
     "/api/history",
+    "/api/vote",
     "/api/video-tasks",
+    "/api/user/image-stats",
     "/api/tutorial-videos",
     "/api/user/membership-summary",
     "/api/user/account-center",
@@ -63,6 +67,11 @@ export async function proxy(request: NextRequest) {
     // 可以在这里添加更严格的检查
   }
 
+  // 浏览器会自动拉取 favicon，不应参与通用 API 限流。
+  if (pathname === "/api/favicon") {
+    return NextResponse.next();
+  }
+
   // 🛡️ 安全检查3：速率限制
   // 对API路径应用速率限制
   if (pathname === "/api/chat") {
@@ -126,6 +135,21 @@ export async function proxy(request: NextRequest) {
         { status: 429 }
       );
     }
+  } else if (pathname === "/api/canvas/auto-title" && request.method === "POST") {
+    const canvasRateLimit = checkRateLimit(request, rateLimiters.canvas);
+    if (!canvasRateLimit.allowed) {
+      console.warn(`[Security] Canvas auto-title rate limit exceeded for IP: ${clientIP}`, {
+        pathname,
+        resetTime: new Date(canvasRateLimit.resetTime).toISOString(),
+      });
+      return NextResponse.json(
+        {
+          error: "Too many canvas requests",
+          retryAfter: Math.ceil((canvasRateLimit.resetTime - Date.now()) / 1000),
+        },
+        { status: 429 }
+      );
+    }
   } else if (
     pathname.startsWith("/api/realtime/") ||
     pathname.startsWith("/api/fal/proxy")