SkyView used to use the data in SQLITE format, but I've changed it to use CDB, same as SoftRF on the T-Echo was already doing. (Or maybe it was the other way around?)
I do have a tool now to do the conversion from the OGN DDB download to CDB right on my computer. I'll add it to my SoftRF github repo soon, I hope. Ideally I would like somebody to confirm that the file it generated really works with SkyView (or SoftRF on the T-Echo).