portal/app/Models/Schedule.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\MorphTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class Schedule extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'schedules';

    public function owner(): morphTo
    {
        return $this->morphTo();
    }
}