ldc-com-app-bo/database/seeders/AppUserSeeder.php

<?php

namespace Database\Seeders;

use App\Models\AppUser;
use Illuminate\Database\Seeder;

class AppUserSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $i = \intval(AppUser::query()->max('order'));
        AppUser::factory(15)->make()->each(function (AppUser $appUser) use (&$i) {
            $appUser->order = $i;
            $appUser->saveOrFail();
            $i = $i + 1;
        });
    }
}