Remove stale paths

[philipa]

When I stop the boat, I turn off the GPS. If I later add some maintenance entry to the signalk-logbook, it uses the stale navigation.datetime, although it is coded to fallback to the system time if navigation.datetime is unavailable.

I'd like to be able to configure something like "remove the navigation.datetime path if its not been updated for 15 minutes". There is already the notion of stale data embodied in "source priorities". It would be nice if that could be extended to remove paths entirely.

Or is there some other workaround for this?

[tkurki]

There should be an option to honor the metadata timeout field, for some paths / all paths but some.