-- CreateTable CREATE TABLE `device_metrics` ( `id` BIGINT NOT NULL AUTO_INCREMENT, `node_id` BIGINT NOT NULL, `battery_level` INTEGER NULL, `voltage` DECIMAL(65, 30) NULL, `channel_utilization` DECIMAL(65, 30) NULL, `air_util_tx` DECIMAL(65, 30) NULL, `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3), `updated_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3), INDEX `device_metrics_created_at_idx`(`created_at`), INDEX `device_metrics_updated_at_idx`(`updated_at`), INDEX `device_metrics_node_id_idx`(`node_id`), PRIMARY KEY (`id`) ) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;