perf: 优化节点后端获取用户用户列表接口响应速度，降低CPU使用资源

database/migrations/2023_12_12_212239_add_index_to_v2_user_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('v2_user', function (Blueprint $table) {
+            $table->index(['u','d','expired_at','group_id','banned','transfer_enable']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('v2_user', function (Blueprint $table) {
+            $table->dropIndex(['u','d','expired_at','group_id','banned','transfer_enable']);
+        });
+    }
+};