List of recent events for each IoT device

Hello, I have some question about this topic.

1º: I create a atribute call ‘transaction’ and configure to ‘store data points’ and ‘Show in dashboard’, but when I go create the table on dashboard, this atribute that I create is not showed, and I can not add to my table. How can I make this to show in my table? Is directly changing my manager_config.json?

2º: The ‘Store Datapoints’ shows the value change in the attribute, but can I see how user changed that?