CREATE TABLE `client_surveys` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `client_id` int(11) NOT NULL,
  `survey_id` int(11) NOT NULL,
  `status` enum('pending','completed') NOT NULL DEFAULT 'pending',
  `completed_at` timestamp NULL DEFAULT NULL,
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `client_id` (`client_id`),
  KEY `survey_id` (`survey_id`),
  CONSTRAINT `client_surveys_ibfk_1` FOREIGN KEY (`client_id`) REFERENCES `clients` (`id`) ON DELETE CASCADE,
  CONSTRAINT `client_surveys_ibfk_2` FOREIGN KEY (`survey_id`) REFERENCES `surveys` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;