#2 Immutable account identifiers?

[Benjamin Ragheb]

Presently each account has an identifier which is generated based
on the account's username and server properties. Although
username is immutable, it is possible to change the server URL of
an account.

Some code depends on being able to located a journal instance via
the accountWithIdentifier: class method. If a server is changed, all
of these references break. Is that a problem?

Should account identifiers be abstract chunks of data linked to the
object instead of the account?

CFUUID could be used to generate identifiers.