incr/app/Models/Tracker.php

<?php

declare(strict_types=1);

namespace App\Models;

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

class Tracker extends Model
{
    /** @use HasFactory<TrackerFactory> */
    use HasFactory;

    protected $fillable = [
        'user_id',
        'label',
        'unit',
        'count',
    ];

    protected function casts(): array
    {
        return [
            'count' => 'integer',
        ];
    }

    /**
     * @return BelongsTo<User, $this>
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
}