/api/sensor_data_sumの性能改善
/api/sensor_data_sumの性能改善

constdrop/rubyiot_server,ossforumjp-app-IoT/rubyiot_server,constdrop/rubyiot_server,constdrop/rubyiot_server,miyohide/rubyiot_server,constdrop/rubyiot_server,miyohide/rubyiot_server,ossforumjp-app-IoT/rubyiot_server,ossforumjp-app-IoT/rubyiot_server,miyohide/rubyiot_server