{
 "reviewed_at": "2026-10-03",
 "status": "HISTORICAL_QUARANTINE_RETAINED",
 "affected": [{"symbol":"EEM","date":"2008-10-13"},{"symbol":"EEM","date":"2008-10-28"}],
 "independent_source": {
   "provider":"BlackRock / iShares",
   "source_url":"https://www.ishares.com/us/products/239637/ishares-msci-emerging-markets-etf",
   "artifact_sha256":"ce4146fc76baed0d03a216b5ef06c034b4d2109112e9f27415e2020ef429a367",
   "finding":"Issuer historical file contains NAV, not market closing prices. Non-comparable evidence; cannot clear a market-close exception. Original file retained locally, not redistributed."
 },
 "other_attempts":[{"source":"Stooq historical CSV","result":"HTTP 404; no corroborating prices obtained"}],
 "decision":"Do not correct or remove prices. Preserve both exceptions and the original retrospective report. A separate prospective account uses a complete audited 400-session input window; 2008 observations do not enter those decisions.",
 "correction_rule":"Only exact dated price evidence from an identified independent upstream with matching adjustment basis and content hash can corroborate. On conflict, preserve original snapshots, create a separately versioned derived dataset with field-level provenance, and rerun under a new experiment ID. No automatic corrections."
}