-- Create responses table
CREATE TABLE IF NOT EXISTS `responses` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `survey_id` int(11) NOT NULL,
  `submitted_at` timestamp NOT NULL DEFAULT current_timestamp(),
  PRIMARY KEY (`id`),
  KEY `survey_id` (`survey_id`),
  CONSTRAINT `responses_ibfk_1` FOREIGN KEY (`survey_id`) REFERENCES `surveys` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Create answers table
CREATE TABLE IF NOT EXISTS `answers` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `response_id` int(11) NOT NULL,
  `question_id` int(11) NOT NULL,
  `answer_value` text DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `response_id` (`response_id`),
  KEY `question_id` (`question_id`),
  CONSTRAINT `answers_ibfk_1` FOREIGN KEY (`response_id`) REFERENCES `responses` (`id`) ON DELETE CASCADE,
  CONSTRAINT `answers_ibfk_2` FOREIGN KEY (`question_id`) REFERENCES `questions` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;