-- Module migration tracking table.
-- Records which migration scripts have been applied per module.
-- Idempotent: safe to run multiple times.

CREATE TABLE IF NOT EXISTS `module_migrations` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `module_id` VARCHAR(64) NOT NULL,
  `filename` VARCHAR(255) NOT NULL,
  `applied_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uq_module_migration` (`module_id`, `filename`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;