-- Migration to add poll votes table
CREATE TABLE IF NOT EXISTS `poll_votes` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `message_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `option_index` int(11) NOT NULL,
  `created_at` timestamp NULL DEFAULT current_timestamp(),
  PRIMARY KEY (`id`),
  UNIQUE KEY `user_poll_option` (`message_id`,`user_id`,`option_index`),
  CONSTRAINT `poll_votes_ibfk_1` FOREIGN KEY (`message_id`) REFERENCES `messages` (`id`) ON DELETE CASCADE,
  CONSTRAINT `poll_votes_ibfk_2` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;