@alex_naka Thanks so much for posting your excellent question and telling us about your exciting work. I think you’ve already found all the datasets that we have for DRG/DH with calcium imaging. I think there isn’t as much extracellular ephys because the DRG, and to a lesser extent, the DH, are hard to access in vivo, especially in mouse. There is some in rat. I was interested in extracellular recordings in DH a while back. You may find some insight in this discussion:
Please keep us posted on your progress. Have you thought about using the Neuropixels technology for DH recording?