finance_app/app/Http/Controllers/CategoryRuleController.php

<?php

namespace App\Http\Controllers;

use App\Models\CategoryRule;
use Illuminate\Http\Request;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;

class CategoryRuleController extends Controller
{
    use AuthorizesRequests;

    public function store(Request $request)
    {
        $validated = $request->validate([
            'keyword'     => 'required|string|max:255',
            'category_id' => 'required|exists:categories,id',
        ]);

        CategoryRule::create([
            ...$validated,
            'user_id' => auth()->id(),
        ]);

        return redirect()->back();
    }

    public function destroy(CategoryRule $categoryRule)
    {
        if ($categoryRule->user_id !== auth()->id()) {
            abort(403);
        }

        $categoryRule->delete();
        return redirect()->back();
    }
}