text: drop table if exists metric_class;
  CREATE TABLE `metric_class`  (
    `id` bigint(20) NOT NULL AUTO_INCREMENT,
    `package_id` bigint(20) NOT NULL,
    `class_name` varchar(255) NOT NULL,
    `inner_fan_in` int(11) NOT NULL,
    `inner_fan_out` int(11) NOT NULL,
    `outer_fan_in` int(11) NOT NULL,
    `outer_fan_out` int(11) NOT NULL,
    `inner_instability` decimal(8,4) NOT NULL,
    `inner_coupling` decimal(8,4) NOT NULL,
    `outer_instability` decimal(8,4) NOT NULL,
    `outer_coupling` decimal(8,4) NOT NULL,
    PRIMARY KEY (`id`),
    INDEX `idx_package_id` (`package_id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
  