LAR_Maintenance/app/Models/Maintenance.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Maintenance extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'description',
        'schedule',
    ];

    public function history()
    {
        return $this->hasMany(MaintenanceHistory::class);
    }

    public function hosts()
    {
        return $this->belongsToMany(Host::class, "maintenance_host", "maintenance_id", "host_id" );
    }
}