{"total":4,"data":[{"id":1,"serial":"CYL-1001","status":"available","location":"factory","created_at":"2025-09-14 10:27:53"},{"id":2,"serial":"CYL-1002","status":"assigned","location":"customer:2","created_at":"2025-09-14 10:27:53"},{"id":3,"serial":"CYL-1003","status":"available","location":"factory","created_at":"2025-09-14 10:27:53"},{"id":4,"serial":"CYL-1004","status":"available","location":"factory","created_at":"2025-09-14 10:27:53"}]}