Add GET /api/health for status.profullstack.com

apps/web/app/api/health/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from 'next/server';
+import { getDb } from '@/lib/db';
+
+// Never cache: a cached 200 would keep reporting health after the app goes away.
+export const dynamic = 'force-dynamic';
+
+const NO_STORE = { 'Cache-Control': 'no-store' };
+
+/**
+ * Liveness for status.profullstack.com: the app answers and the database
+ * answers `SELECT 1` within 3s. Unlike /api/health/db it never says why it
+ * failed.
+ */
+export async function GET() {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  try {
+    await Promise.race([
+      getDb().sql`SELECT 1`,
+      new Promise((_, reject) => {
+        timer = setTimeout(() => reject(new Error('timeout')), 3000);
+      }),
+    ]);
+    return NextResponse.json({ status: 'ok', db: 'ok' }, { headers: NO_STORE });
+  } catch {
+    return NextResponse.json({ status: 'error', db: 'down' }, { status: 503, headers: NO_STORE });
+  } finally {
+    clearTimeout(timer);
+  }
+}