add directory for common assets

common/prisma/migrations/20240313115208_create_device_metrics_table/migration.sql

@@ -0,0 +1,16 @@
+-- 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;