Where do zwave entity ID remapping values get stored?

Configuration Z-Wave
1

When you add a new zwave device and change the entityID in the UI, where do those values get stored?

2

.storage/core.entity_registry

3

Is it safe for me to open and modify that when the system is off?

4

It’s not meant to be edited, but you certainly can, just be careful with the formatting. HA assumes it’s not edited so any syntax issues will cause trouble.