{
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      "message_long": "Expiry rejected: insufficient_strikes",
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    {
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    },
    {
      "code": "baseline_fallback",
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      "interval_to": "2026-08-25",
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      "target_key": "08-04\u219208-25",
      "message_short": "Baseline fallback",
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      "metrics": {
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    },
    {
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      "target_key": "08-04\u219208-25",
      "message_short": "LOW confidence",
      "message_long": "Event confidence: LOW (baseline not robust)",
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        "confidence": "LOW"
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    {
      "code": "baseline_fallback",
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      "interval_to": "2026-09-29",
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      "target_key": "08-25\u219209-29",
      "message_short": "Baseline fallback",
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      "metrics": {
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    {
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      "code": "low_coverage",
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    "build_metadata": {
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      "id_namespace": "market_calendar",
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}