Function set_full_name 

pub fn set_full_name(
    conn: &Connection,
    name: &str,
    full_name: &str,
) -> Result<()>

Reset every face of a person back to unassigned. Deliberately does NOT touch cluster_id, so a face rejoins its cluster’s unassigned group rather than scattering to singletons. Change only what a person is shown as, never their identity.

This is the only rename there is. Identity is permanent: Erhan to Erhan Gündoğan is a display correction even though its normalized form would change too, and there is no way to ask for the other reading. One row, no face touched, and /people/person/<name> keeps working, which is the whole reason identity and display are separate.