feat: GET /api/health with a database check

src/app/api/health/route.js

@@ -0,0 +1,24 @@
+import { NextResponse } from 'next/server';
+import { getServiceRoleClient } from '@/lib/supabase/service-role.js';
+
+export const dynamic = 'force-dynamic';
+
+const headers = { 'Cache-Control': 'no-store' };
+
+/**
+ * Health check for status.profullstack.com: one cheap PostgREST HEAD query,
+ * capped at 3s. Never echoes the error, so nothing about the setup leaks.
+ */
+export async function GET() {
+	try {
+		const { error } = await getServiceRoleClient()
+			.from('users')
+			.select('id', { head: true })
+			.limit(1)
+			.abortSignal(AbortSignal.timeout(3000));
+		if (error) throw error;
+		return NextResponse.json({ status: 'ok', db: 'ok' }, { headers });
+	} catch {
+		return NextResponse.json({ status: 'error', db: 'down' }, { status: 503, headers });
+	}
+}

src/middleware.js

@@ -23,6 +23,9 @@ export function middleware(request) {
     return NextResponse.redirect(url, 301);
   }
 
+  // Health checks (status.profullstack.com) are never rate limited.
+  if (pathname === '/api/health') return NextResponse.next();
+
   const ip = getClientIp(request);
 
   // Rate limiting