Heartbeats for more accurate visit duration tracking

I consider switching from [Shynet]( to Umami as Shynet doesn't get any updates and doesn't support events out of the box. but one thing I'm missing in Umami are heartbeats.

Once the Shynet tracker is loaded on a website, it sends heartbeats for the current session every x seconds. This allows for a pretty accurate session duration tracking even on single-page websites like my portfolio. Example: the user spends 45 seconds on the page, so a heart beat is sent 4 times, which results in a tracked session duration of 40 seconds in Shynet.

In Umami however, the bounce rate for my website is 100% and the session/visit duration 0s. This also applies to blog posts where people spent some time reading and then close the page. That's pretty unfortunate.

I would even contribute this feature, but I'm not sure if that would break the metrics processing in Umami.

What do you think?