how to determine when a node is "last seen"?

[Adorfer]

In the metrics-file i miss the value of the date/time when a node has been last seen.

having this it would make it easier to determine if it should be considered, not beeing connected to the main mesh network.

[Adorfer]

there is a method to determine the date: Look back in the database for the timestamp of "meshnode_uptime" where the value increased the last time.