expense-tracker-inertiajs/app/Models/Category.php

<?php

namespace App\Models;

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

class Category extends Model
{
    use HasFactory, SoftDeletes;

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

    public function budgets()
    {
        return $this->hasMany(Budget::class)->withTrashed();
    }

    public function transactions()
    {
        return $this->hasMany(Transaction::class);
    }
}