incr/app/Models/Tracker.php

<?php

declare(strict_types=1);

namespace App\Models;

use App\Models\Transactions\Entry;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Tracker extends Model
{
    protected $fillable = [
        'user_id',
        'asset_id',
        'label',
        'unit',
        'price_tracking_enabled',
    ];

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

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function asset(): BelongsTo
    {
        return $this->belongsTo(Asset::class);
    }

    public function entries(): HasMany
    {
        return $this->hasMany(Entry::class);
    }

    public function milestones(): HasMany
    {
        return $this->hasMany(Milestone::class);
    }
}