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

app/api/admin/users/[id]/route.ts

@@ -1,8 +1,9 @@
-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 { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -27,7 +28,7 @@ export async function GET(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
 
   const admin = getSupabaseAdmin();
@@ -35,7 +36,7 @@ export async function GET(
   const { data: userRes, error: userErr } =
     await admin.auth.admin.getUserById(id);
   if (userErr || !userRes.user) {
-    return NextResponse.json({ error: 'user not found' }, { status: 404 });
+    return jsonNoStore({ error: 'user not found' }, { status: 404 });
   }
   const u = userRes.user;
 
@@ -54,7 +55,7 @@ export async function GET(
     .order('created_at', { ascending: false })
     .limit(25);
 
-  return NextResponse.json({
+  return jsonNoStore({
     user: {
       id: u.id,
       email: u.email ?? null,
@@ -88,10 +89,10 @@ export async function DELETE(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
   if (id === auth.user.id) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'you cannot delete your own account' },
       { status: 400 },
     );
@@ -99,12 +100,32 @@ export async function DELETE(
 
   const admin = getSupabaseAdmin();
 
-  // Remove the tunnel row first (FK to auth.users).
-  await admin.from('tunnels').delete().eq('user_id', id);
+  // Delete the AUTH USER first. Only if that succeeds do we remove the tunnel
+  // row, so a mid-failure never leaves an orphaned auth user with a dangling
+  // tunnel (or half-deletes the tunnel of an already-gone user).
+  const { error: delErr } = await admin.auth.admin.deleteUser(id);
+  if (delErr) {
+    const httpStatus = (delErr as { status?: number }).status;
+    const message = (delErr.message ?? '').toLowerCase();
+    if (httpStatus === 404 || message.includes('not found')) {
+      return jsonNoStore({ error: 'user not found' }, { status: 404 });
+    }
+    console.error('admin user.delete: deleteUser failed', delErr);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
+  }
 
-  const { error } = await admin.auth.admin.deleteUser(id);
-  if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+  // The auth user is gone, so no orphaned-user state is possible. Removing the
+  // tunnel row is best-effort cleanup: if it fails we log server-side but still
+  // report the (already-completed) user deletion as successful.
+  const { error: tunnelErr } = await admin
+    .from('tunnels')
+    .delete()
+    .eq('user_id', id);
+  if (tunnelErr) {
+    console.error(
+      `admin user.delete: tunnel cleanup failed for ${id}`,
+      tunnelErr,
+    );
   }
 
   await logAdminAction(auth.user, {
@@ -113,5 +134,5 @@ export async function DELETE(
     target_id: id,
   });
 
-  return NextResponse.json({ ok: true });
+  return jsonNoStore({ ok: true });
 }