Domoticz

I have a script that stores the data from my solar panels in a Dummy Electricity (instant and counter) device. Every day, yesterday's revenue is entered as negative in the database.
So my energy dashboard also shows a negative value in today's data.

Anyone have any ideas to solve this?

So you feed a day-counter value as the total counter, which is reset to 0 each day, as the Counter value of the Dummy Energy device?
When that is the case you need to retrieve "yesterday's" Counter from the database and add the current day counter to it and feed that as the new current counter.