在SPA项目中的Users表里的is_active字段是做什么用的啊？

 Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->string('password');
            $table->boolean('is_active')->default(false);
            $table->rememberToken();
            $table->timestamps();
        });