1.) Nope, not possible to merge two journals. I remember we had a suggestion about it, but I don't remember whether it was migrated or rejected
2.) (Assuming no merge): If you rename A (username: apple) to B (username:banana), your user A will now have the username banana, but will still retain all the friends from when they were called apple.
B will be called ex_banana123, and will retain all friends from when they were banana.
(There are options to break the ties, but to keep things simple...)
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1.) Nope, not possible to merge two journals. I remember we had a suggestion about it, but I don't remember whether it was migrated or rejected
2.) (Assuming no merge): If you rename A (username: apple) to B (username:banana), your user A will now have the username banana, but will still retain all the friends from when they were called apple.
B will be called ex_banana123, and will retain all friends from when they were banana.
(There are options to break the ties, but to keep things simple...)