Function holder_update 

fn holder_update(
    conn: &Connection,
    sql: impl Fn(&str) -> String,
    params: &[&dyn ToSql],
) -> Result<Option<HolderMatch>, StoreError>

Run a holder-only UPDATE (sql renders it around a holder predicate) with the UID predicate, then the name one. Every holder statement binds ?1 id, ?2 the request’s name, ?3 the fence and ?6 the caller’s UID ('' when Unattributed).