Developer need to double check save and load

[Ismoh]

Is your feature request related to a problem? Please describe.
Client connects and has guid 123, server has the same guid. Clients guid changed. Client disconnects and connect to an old save, where guid was 123. Client isn't able to get his old minä back. Huge problem!

Describe the solution you'd like
If client connects and guid matched to a minä, merge it.
If client connects and none of any guid matches, server can assign client to an existing minä.

Describe alternatives you've considered
There is none!