Comment 1 for bug 1806968

My branch: http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/khuckins/lp1806968-vandelay-record-type-sql

The fix as is changes record_type to a string constrained to "authority" or "bib," defaulting to "bib." Originally, this was tied to the enum "bib_queue_queue_type," which did not support authority records.