Propose weekly metric values on Statistics Graphs and Energy dashboard

The statistics graph proposes to show total/mean/max/min values for periods of 5 min/1 hour/1day/1 month.
The energy dashboard shows the total for each hour, day or month.

The consumption of my household has a typical weekly pattern: higher consumption of utilities during the weekend than during the week. It would be nice to see the evolution of the use of the utilities week by week because that would be a more stable comparison rather than getting a seamingly erratic evoluion.

This is a screenshot of the statistics graph configuration and sample graphs on the right.

(the above screenshot also demonstrates my other feature request: History: Make all times line up on the history page for easy comparison ).

I second this. I have a graph to monitor fuel price changes, and since those change per week, having this would be very much welcomed.