Any value in supplying a single insert statement a la (less back and forth perhaps?):
Yes, absolutely that would be better. This particular endpoint has some ancient + crufty code backing it (migrated from a NoSQL DB with a db-agnostic shim that we're slowly replacing). The old code likes doing things client-side instead of being sane about SQL semantics.
But I don't think that would affect the issue here, right?
Jake Biesinger