Tobias, thanks for all of your help so far.
Is it better to use the Ajax auto-refresh or the table update? Is there a use case for each?
With regard to poorpigs.de and the tables you are using, is the table here built with TablePress? I am looking to use row/detail expansion as well.
If I continue from that table and click on one of the years I see the detail of stats in another table as in here. If this is also implemented with TablePress, did you do it via data or formulas?