test/app/Http/Models/SitesStatus.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Model;

class SitesStatus extends Model
{
    protected $primaryKey = 'site_id';
    protected $table = 'site_status';
    protected $guarded = [];

    public function users()
    {
        return $this->belongsToMany(User::class, 'user_has_sites', 'site_id', 'user_id');
    }
}