<?php
try {
    $pdo = new PDO(
        'mysql:host=' . getenv('DB_HOST') . ';port=' . (getenv('DB_PORT') ?: '3306') . ';dbname=' . getenv('DB_DATABASE') . ';charset=utf8mb4',
        getenv('DB_USERNAME'),
        getenv('DB_PASSWORD')
    );
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
} catch (PDOException $e) {
    http_response_code(500);
    die(json_encode(['error' => 'Database connection failed.']));
}