koel/database/seeds/SettingTableSeeder.php

<?php

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

class SettingTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        Setting::set('media_path', '');
    }
}