{
  "title": "Central bank data vintages for AI evaluation",
  "source_page": "https://fiund.com/industries/central-bank-release-vintage-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "A later revision cannot appear in an earlier analyst's information set",
    "context": "A wholly invented economic series uses index points and dated publication cards. It contains no actual central-bank data or claim about historical economic conditions.",
    "records": [
      [
        "CV1",
        "Initial release",
        "Observation period January: 102.0 index points, first published February 5."
      ],
      [
        "CV2",
        "Revision release",
        "Same January observation: 101.4 index points, published March 5. Revision explicitly replaces the earlier January value in the current series."
      ],
      [
        "CV3",
        "Analyst note date",
        "Note dated February 20 asks about January. A second question asks for a February observation as of February 20, before its fictional March 5 first release."
      ]
    ],
    "question": "Which January value was available for the February 20 note, and was a February observation available under the supplied release history?",
    "answer": "CV1's 102.0 was published before the note, while CV2's 101.4 revision was not available until March 5. Use 102.0 for the February 20 information set and retain 101.4 as the later revised January value. CV3 gives no February observation released by February 20. Do not backfill it from March or confuse the observation month with the date a reader could first access a value.",
    "failureModes": [
      "Using today's revised series as if its values were known on an earlier date.",
      "Matching observation period while ignoring the first publication timestamp."
    ],
    "fields": [
      [
        "Observation period",
        "Identifies what the value describes."
      ],
      [
        "Publication date and vintage",
        "Defines availability at the requested cutoff."
      ],
      [
        "Value, unit and revision link",
        "Preserves numerical meaning across releases."
      ]
    ],
    "holdout": "Move the note date to March 6. Require the revised January value and newly available February observation, with separate release citations.",
    "boundary": "Use original fictional series or separately cleared public data. Archive availability does not establish third-party reuse rights; exclude embargoes and internal forecasts."
  }
}