CREATE TABLE IF NOT EXISTS `ratings` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `order_id` INT NOT NULL,
  `restaurant_id` INT NOT NULL,
  `user_id` INT NOT NULL,
  `rating` INT NOT NULL,
  `comment` TEXT,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (`order_id`) REFERENCES `orders`(`id`),
  FOREIGN KEY (`restaurant_id`) REFERENCES `restaurants`(`id`),
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`)
);