feat: non-blocking background URL title fetching via Next.js after()

src/app/api/shorten/route.ts

@@ -1,9 +1,10 @@
-import { NextResponse } from "next/server";
+import { NextResponse, after } from "next/server";
 import bcrypt from "bcryptjs";
 import { prisma } from "@/lib/prisma";
 import { getCurrentUser } from "@/lib/auth";
 import { generateRandomCode, getDefaultUrlLength } from "@/lib/short-code";
 import { generateQRCodeDataUrl } from "@/lib/qr";
+import { fetchUrlTitle } from "@/lib/url-metadata";
 
 export async function POST(req: Request) {
   try {
@@ -140,6 +141,22 @@ export async function POST(req: Request) {
     // Generate QR Code
     const qrCodeDataUrl = await generateQRCodeDataUrl(fullShortUrl, { size: 240 });
 
+    // Non-blocking background task via Next.js after()
+    // Response is returned immediately to the client; title is fetched & updated afterward.
+    after(async () => {
+      try {
+        const pageTitle = await fetchUrlTitle(url.trim());
+        if (pageTitle) {
+          await prisma.shortUrl.update({
+            where: { id: createdUrl.id },
+            data: { title: pageTitle },
+          });
+        }
+      } catch {
+        // Silently ignore background scraping errors
+      }
+    });
+
     return NextResponse.json({
       success: true,
       data: {