Best strategy for logging machine runtime for analytics

Hello, we run a manufacturing operation with 18 laser cutters. Our goal is to log their run time and idle time so that we can report on the efficiency of the production staff across certain days, shifts, weeks, etc.

I've created a device that detects when the machine starts or stops, and calls a Restlet to update an ASSET record in Netsuite. The asset record tracks the current state of the machine, as well as the date/time that the state changed. We're using this data for digital signage to show the current status of the machines.

Right now there is only the System Information log that tracks when field values change. So technically we have a history of every time its run_state changes from running to idle and back. But this log is probably not the most ideal for reporting.