Connect the timeslider widget to the data, so that the period chosen in the timeslider filters the elements on the map. Probably can be done by making the layer time-enabled.
Adjust one entry for the first_date column which was set to 1.1.1970, which is the start date of the time in the internet, so it was not meaningful and I just deleted it. The reason for why this was a problem is that the timeline adjusted its range automatically
Connect the timeslider widget to the data, so that the period chosen in the timeslider filters the elements on the map. Probably can be done by making the layer time-enabled.