Events page displays negative event detector event duration

[terrypacker]

The events page is trying compute the duration of the event when it is fired but I imagine it is trying to compute a duration based on the wrong criteria.

I am using a binary state detector for state zero for 1s on a 5s alternating point.

[terrypacker]

I think this is the problem in events.js:

                // round to prevent infinite digests
                const time = Math.floor(new Date().valueOf() / 1000) * 1000;
                return time - this.activeTimestamp;

If time is rounded down below active timestamp then this can happen.