I switched from using a usb datalogger to Weatherlink IP, which resulted in duplicate stations as you describe. The technician from Davis with whom I spoke, deleted the old station and all of it's data. Afterward, I was able to make myself clear in that I wanted the station data merged, and I did NOT want all of the data from datalogger days deleted. Somehow, they were able to recover the data a few days later. This was very unexpected, a second Davis technician having verified that station deletions are permanent, an action that cannot be undone. When at last the data was recovered, I was told that it cannot be merged. Stations can, however, be renamed (without even calling Davis). I gave the old station a name which tells me it is historical data only.
If you find a way to merge the data, I'd appreciate some information on how it's done.
I would be really hesitant in telling Davis to "delete" the old station.
