Forecast is for maximum of 2 days afaik (I don’t see more data returning).
And yes indeed it’s driven by the sun not wind or low prices. But with vat and tax not returning on sold electricity (end of ‘saldering’ in 2027) the price has to have extreme highs and lows before purchasing and selling back will be profitable.
So it’s not perfect and a hybride mode instead of green and trade would still be preferred.
For most of the time it will be probably more profitable than buying from grid during days with less solar energy.