fix(admin): fresh SSR reads, atomic user delete + sanitized errors, cookie-rotation in middleware, no-store on admin APIs

app/api/admin/tunnels/[id]/reassign/route.ts

@@ -1,10 +1,11 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
 import { validateSubdomain } from '@/lib/validation';
 import { isSubdomainReserved } from '@/lib/admin/reserved';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -18,26 +19,26 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   let body: { subdomain?: unknown };
   try {
     body = (await req.json()) as { subdomain?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
 
   // Same validation as the user-facing claim flow (format + hardcoded reserved).
   const v = validateSubdomain(body.subdomain);
   if (!v.ok) {
-    return NextResponse.json({ error: v.error }, { status: 400 });
+    return jsonNoStore({ error: v.error }, { status: 400 });
   }
   const subdomain = v.value;
 
   // Also reject anything reserved in the DB table.
   if (await isSubdomainReserved(subdomain)) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: `'${subdomain}' is reserved` },
       { status: 400 },
     );
@@ -52,7 +53,7 @@ export async function POST(
     .eq('subdomain', subdomain)
     .maybeSingle<{ user_id: string }>();
   if (existing && existing.user_id !== id) {
-    return NextResponse.json({ error: 'subdomain taken' }, { status: 409 });
+    return jsonNoStore({ error: 'subdomain taken' }, { status: 409 });
   }
 
   const { data, error } = await admin
@@ -64,12 +65,13 @@ export async function POST(
   if (error) {
     const code = (error as { code?: string }).code;
     if (code === '23505') {
-      return NextResponse.json({ error: 'subdomain taken' }, { status: 409 });
+      return jsonNoStore({ error: 'subdomain taken' }, { status: 409 });
     }
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.reassign failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   await logAdminAction(auth.user, {
@@ -79,5 +81,5 @@ export async function POST(
     details: { subdomain },
   });
 
-  return NextResponse.json({ ok: true, subdomain });
+  return jsonNoStore({ ok: true, subdomain });
 }