Hi Augustinus,
sorry for the trouble, now we have checked the problem again, and we could sove the issue.
Background: It seems like the Windy API doesn't handle data uploads together with station attributes (like location, name, etc.) for 400+ stations, as we got "We are sorry, but something broke." response from the Windy server. From now we upload the data in batches with 100-100 stations' data only in one single API call and now more or less it seems to be working.
Best Regards, Holfuy Team