This I found out from the source code for the table MultiMeter (and I guess it applies to the MultiMeter_Calendar table,but I am not sure):

value1 = powerusage1;
value2 = powerdeliv1;
value3 = usagecurrent;
value4 = delivcurrent;
value5 = powerusage2;
value6 = powerdeliv2;

Can you elaborate on the hardware setup and the python scripting used for the AS3935?

Did you find it out? I am interested as well.

Is there any information available on the meaning of the columns in the database tables MultiMeter and MultiMeter_Calendar. For some I can deduce the meaning but other are elusive.