Deduplicate uuids fetched from sql and handle absent uuids in 999 #983
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We discovered that some records already had 999 fields without subfield I, and the code was just looking for the first 999 field and silently skipping the block when no subfield I was present. This change checks all of the 999 fields for uuids and raises an excepted exception if none are found.
Also de-duplicate any uuids fetched via SQL for updates and deletes.