-- Migration: create course_media table
CREATE TABLE IF NOT EXISTS `course_media` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `course_id` int(11) NOT NULL,
  `lesson_id` int(11) DEFAULT NULL,
  `file_path` varchar(255) NOT NULL,
  `mime` varchar(100) DEFAULT NULL,
  `size` int(11) DEFAULT NULL,
  `thumbnail_path` varchar(255) DEFAULT NULL,
  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_course_id` (`course_id`),
  KEY `idx_lesson_id` (`lesson_id`),
  CONSTRAINT `fk_media_course_id` FOREIGN KEY (`course_id`) REFERENCES `courses` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;