Give the Writer a Gateway of Its Own

The last post put a gateway in front of the read side of a claim check and left the write side alone on purpose. The producer owned the documents it wrote, so it held s3:PutObject and wrote to the bucket directly, and I said that was a fine decision for exactly one writer. I closed with a line I’ve been meaning to come back to: whether the write side deserved the same treatment was a longer conversation. This is that conversation, and this time it comes with a second commit history to point at instead of just an argument.