David Staudt | In CM5+, the user record is stored in the DB with a UUID primary key. The username is modifiable in this case as the primary key UUID - which relates to the other data tables that refer to the user - remains the same.
For CM4, the user record is stored in an LDAP, with the username as the primary key (equivalent.) As a result it is not modifiable without violating the related data constraints. |
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