How to Implement Video Categories with Caching Strategy

Introduction Categories are the backbone of content organization on any video platform. But they're also one of the most-queried pieces of data — every page needs them for navigation. Here's how I implemented a category system with smart caching for ViralVidVault . The Category Data Model <?php class Category { public function __construct ( public readonly int $id , public readonly string $name , public readonly string $slug , public readonly int $videoCount = 0 , public readonly ?string $iconEmoji = null , ) {} public static function fromRow ( array $row ): self { return new self ( id : ( int ) $row [ 'id' ], name : $row [ 'name' ], slug : $row [ 'slug' ], videoCount : ( int )( $row [ 'video_count' ] ?? 0 ), iconEmoji : $row [ 'icon_emoji' ] ?? null , ); } } The Repository with Cache <?php class CategoryRepository { private const CACHE_KEY = 'global:categories' ; private const CACHE_TTL = 86400 ; // 24 hours private \PDO $db ; private DataCache $cache ; public function __construct ( \