perf: fix getTrafficRank slow query with index and batch loading

database/migrations/2026_03_11_000002_add_stat_user_record_at_index.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('v2_stat_user', function (Blueprint $table) {
+            $table->index(['record_at', 'user_id'], 'idx_stat_user_record_user');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('v2_stat_user', function (Blueprint $table) {
+            $table->dropIndex('idx_stat_user_record_user');
+        });
+    }
+};