those things are so useless if your time points arent equidistant (ie, you don't care about the last 100 rows, you care about the last 5 minutes). they basicall

those things are so useless if your time points arent equidistant (ie, you don't care about the last 100 rows, you care about the last 5 minutes). they basically force you to use very slow correlated subqueries. please do something better.