Is it somehow possible to store a variable into database with a specified date? My idea is to monitor my energy consumption manually. I have stored my energy consumption by now within an excel sheet and I want transfer these data to a pimatic variable. In future it would be nice to just read the actual value of the energy meter and store it by a variable input device into database. Afterwards the energy consumption should be calculated by the difference of the last two values and stored dates of the values.