User traffic can now be viewed by node

database/migrations/2025_11_29_000000_add_server_id_to_stat_user.php

@@ -0,0 +1,37 @@
+<?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_stat_user', function (Blueprint $table) {
+            // Add server_id column as nullable for backward compatibility
+            $table->integer('server_id')->nullable()->after('user_id')->comment('节点ID (nullable for legacy data)');
+            
+            // Add index for per-node queries
+            if (config('database.default') !== 'sqlite') {
+                $table->index(['user_id', 'server_id', 'record_at'], 'user_server_record_idx');
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('v2_stat_user', function (Blueprint $table) {
+            if (config('database.default') !== 'sqlite') {
+                $table->dropIndex('user_server_record_idx');
+            }
+            $table->dropColumn('server_id');
+        });
+    }
+};