Current config:
<?php
/**
 * Configuración de Base de Datos
 * Patrón Singleton para conexión PDO
 */

class Database {
    private static ?Database $instance = null;
    private ?PDO $connection = null;

    private string $host = 'localhost';
    private string $dbname = 'totem_kiosk';
    private string $username = 'totem_db';
    private string $password = 'Totem2026..';
    private string $charset = 'utf8mb4';

    private function __construct() {
        try {
            $dsn = "mysql:host={$this->host};dbname={$this->dbname};charset={$this->charset}";
            $options = [
                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES   => false,
            ];
            $this->connection = new PDO($dsn, $this->username, $this->password, $options);
        } catch (PDOException $e) {
            die("Error de conexión: " . $e->getMessage());
        }
    }

    public static function getInstance(): self {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function getConnection(): PDO {
        return $this->connection;
    }

    private function __clone() {}
}