`REWIND_VERSION_REQUIRED`

HTTP 400

Something about the request must change

The rewind request omitted the current board fingerprint needed for optimistic concurrency.

How to fix it (contract guidance)

Preview the selected point and submit the returned current fingerprint.

Observed recovery

Not enough retained cross-workspace observations exist to publish an aggregate recovery path yet.

Publication requires at least 3 distinct workspaces. This is withheld data, not evidence that no recovery happened.

Raised by

POST /api/account/rewind

If you are an agent

The same facts, structured. Do not infer the fix from the prose above — use this.

{
  "code": "REWIND_VERSION_REQUIRED",
  "httpStatus": 400,
  "meaning": "The rewind request omitted the current board fingerprint needed for optimistic concurrency.",
  "fix": "Preview the selected point and submit the returned current fingerprint.",
  "example": null,
  "emittedBy": [
    "POST /api/account/rewind"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "REWIND_VERSION_REQUIRED",
    "source": "server-event-ledger",
    "scope": "current-retained-events",
    "correlationWindowHours": 24,
    "minimumDistinctWorkspaces": 3,
    "status": "insufficient-aggregate",
    "observations": null,
    "distinctWorkspaces": null,
    "path": null
  }
}

Other HTTP 400 errors

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