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Optimistic concurrency or a uniqueness constraint lost a race. This is the one 4xx worth retrying, but not with the same body: reload to pick up the current version, then apply your change again.
  • Errors - how to branch on code, and what not to render from detail.
  • Problem catalog - every code, its status, and whether retrying helps.
  • Troubleshooting - what a message in the product means.