CREATE TABLE IF NOT EXISTS `users` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(255) NOT NULL,
  `email` VARCHAR(255) NOT NULL UNIQUE,
  `phone` VARCHAR(50) NULL UNIQUE,
  `password` VARCHAR(255) NOT NULL,
  `profile` TEXT NULL, -- For storing quiz answers/preferences as JSON
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);