SDAPI importers erroring post-Valkyrie

[KatharineV]

I ran two importers on 12/4 that appeared to run successfully all day. GoodJobs was humming along and new works were importing correctly when I left work at 5:30pm. Then I checked this morning (12/5) and GoodJobs was quiet but the importers read that works were enqueued and works had failed (!!!) which I didn't expect to see post-Valkyrie. I know the CSVs are fine and there are no files attached to the records being imported. Most of the works had imported prior to Valkyrie, but some failed due to Fedora issues, so I reran them yesterday to catch the works that dropped. If the dashboard counts are right, then the importers errored even with Valkyrie (NOooooo!). I cannot check the importers more closely because the pages won't load. They spin and spin and spin and then give me an Ajax error or a CloudFlare error. Something is obviously wrong, and it seems to have triggered other issues (see ticket #901).

Importer links and error messages:

A. https://sdapi.b2.adventistdigitallibrary.org/importers/557?locale=en

B. https://sdapi.b2.adventistdigitallibrary.org/importers/171?locale=en