ldc-flucollector/app/Models/ServiceStat.php

<?php

namespace App\Models;

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

class ServiceStat extends Model
{
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var string[]
     */
    protected $fillable = ['date'];

    /**
     * The model's attributes.
     *
     * @var array
     */
    protected $attributes = [
        'nb_calls' => 0
    ];

    // * RELATIONS

    /**
     * Get the Service that owns the ServiceStat
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function service(): BelongsTo
    {
        return $this->belongsTo(Service::class);
    }
}