Variable DirectThreadParticipantSchema`Const`

DirectThreadParticipantSchema: Struct<
    {
        full_name: String;
        pk: String;
        thread_v2_id: String;
        username: String;
    },
> = ...

One participant as a thread lists them. The entry carries the thread id the nickname editor is opened with, so the participant's own openNicknameEditor reads the thread context from the entry it is shown from, as a feed's items carry the feed's context.