{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "additionalProperties": false,
  "required": ["outcome", "affectedRows", "mutationChecksum"],
  "properties": {
    "outcome": { "enum": ["succeeded", "failed", "unknown", "stale-before"] },
    "affectedRows": { "type": "integer", "minimum": 0, "maximum": 1 },
    "mutationChecksum": { "type": "string", "minLength": 1, "maxLength": 160 },
    "safeMessage": { "type": "string", "maxLength": 240 }
  }
}