feat：项目任务用户表 添加索引 “userid”

database/migrations/2023_07_03_212841_add_index_to_project_task_users_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddIndexToProjectTaskUsersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('project_task_users', function (Blueprint $table) {
+            if (Schema::hasColumn('project_task_users','userid')) {
+                $table->index('userid');
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return voidw
+     */
+    public function down()
+    {
+        Schema::table('project_task_users', function (Blueprint $table) {
+            $table->dropIndex(['userid']);
+        });
+    }
+}