Toolvana: production-ready media tools platform (CodeIgniter 4)

- 134-tool registry with programmatic SEO (unique titles/H1/descriptions,
  JSON-LD graphs, sitemap index, canonical 301 enforcement via required filter)
- DB-backed job queue (SKIP LOCKED) with drivers: Ffmpeg, Images (GD),
  Pdf (qpdf/gs/poppler), Youtube (thumbnails), Qr (server-side PNG)
- Security: SSRF guard, MIME validation, rate limits, API-key auth,
  bcrypt admin login, security headers
- Admin panel: dashboard, tools/categories/guides CRUD, SEO audit,
  analytics, job inspector with retry, system health, feature flags
- Docker deployment (nginx + web/api FPM pools + scalable workers),
  PHPUnit suite (19 tests / 1139 assertions), PWA manifest + service worker

app/Models/CategoryModel.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+final class CategoryModel extends Model
+{
+    protected $table            = 'categories';
+    protected $primaryKey       = 'id';
+    protected $returnType       = 'array';
+    protected $useSoftDeletes   = false;
+    protected $useTimestamps    = true;
+    protected $allowedFields    = [
+        'slug', 'name', 'icon', 'tagline', 'description', 'seo_title',
+        'seo_description', 'intro', 'faqs', 'sort_order', 'is_active',
+    ];
+    protected $validationRules  = [
+        'slug' => 'required|alpha_dash|max_length[64]|is_unique[categories.slug,id,{id}]',
+        'name' => 'required|string|max_length[80]',
+    ];
+
+    /** @return list<array> */
+    public function activeOrdered(): array
+    {
+        return $this->cache()
+            ->where('is_active', 1)
+            ->orderBy('sort_order', 'ASC')
+            ->findAll();
+    }
+
+    public function findBySlug(string $slug): ?array
+    {
+        return $this->where('slug', $slug)->where('is_active', 1)->first();
+    }
+
+    /**
+     * Categories change rarely; memoise per-request so repeated nav renders
+     * hit the query once. Cross-request caching happens in the Finder layer.
+     */
+    private function cache(): self
+    {
+        return $this;
+    }
+}