fix: resolve Vercel timeout on /api/data by adding maxDuration and cron cache warming

The API routes were timing out at 15s on cache miss because no maxDuration
was configured and the cron endpoint referenced in vercel.json was missing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: williamluke4

pages/api/cron.ts

@@ -0,0 +1,48 @@
+/**
+ * Cron endpoint to pre-warm caches
+ * Scheduled via vercel.json to run every 6 hours
+ */
+
+import { cacheWithExpiry } from "@utils/cache";
+import { fetchGraphData, fetchGlobeData } from "@lib/api/data-service";
+import {
+  CACHE_KEY,
+  CACHE_TTL_SECONDS,
+  GLOBE_CACHE_KEY,
+  GLOBE_CACHE_TTL_SECONDS,
+} from "@config/cache";
+import type { NextApiRequest, NextApiResponse } from "next";
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  const authHeader = req.headers.authorization;
+  if (authHeader !== `Bearer ${process.env.CRON_SECRET}`) {
+    return res.status(401).json({ error: "Unauthorized" });
+  }
+
+  try {
+    await Promise.all([
+      cacheWithExpiry(CACHE_KEY, CACHE_TTL_SECONDS, fetchGraphData, true),
+      cacheWithExpiry(
+        GLOBE_CACHE_KEY,
+        GLOBE_CACHE_TTL_SECONDS,
+        fetchGlobeData,
+        true
+      ),
+    ]);
+
+    return res.status(200).json({ ok: true });
+  } catch (error) {
+    console.error("Cron cache warm failed:", error);
+    return res.status(500).json({
+      error: "Cache warm failed",
+      details: error instanceof Error ? error.message : String(error),
+    });
+  }
+}
+
+export const config = {
+  maxDuration: 120,
+};

pages/api/data.ts

@@ -36,6 +36,7 @@ export default async function handler(
 }
 
 export const config = {
+  maxDuration: 60,
   api: {
     responseLimit: false,
   },

pages/api/geo.ts

@@ -37,6 +37,7 @@ export default async function handler(
 }
 
 export const config = {
+  maxDuration: 60,
   api: {
     responseLimit: false,
   },