{
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      "interval_to": null,
      "strike": null,
      "target_key": "2026-09-29",
      "message_short": "LOW tier (direct straddle)",
      "message_long": "Accept tier: LOW (DIRECT_STRADDLE_ONLY path)",
      "metrics": {}
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    {
      "code": "low_tier",
      "scope": "expiry",
      "severity": "WARN",
      "expiry_dt": "2026-12-29",
      "interval_from": null,
      "interval_to": null,
      "strike": null,
      "target_key": "2026-12-29",
      "message_short": "LOW tier (direct straddle)",
      "message_long": "Accept tier: LOW (DIRECT_STRADDLE_ONLY path)",
      "metrics": {}
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      "scope": "expiry",
      "severity": "INFO",
      "expiry_dt": "2027-03-30",
      "interval_from": null,
      "interval_to": null,
      "strike": null,
      "target_key": "2027-03-30",
      "message_short": "Rejected: insufficient_strikes",
      "message_long": "Expiry rejected: insufficient_strikes",
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    {
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      "interval_from": "2026-07-21",
      "interval_to": "2026-07-28",
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      "target_key": "07-21\u219207-28",
      "message_short": "LOW confidence",
      "message_long": "Event confidence: LOW (baseline not robust)",
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      "interval_to": "2026-08-25",
      "strike": null,
      "target_key": "07-28\u219208-25",
      "message_short": "LOW confidence",
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      "metrics": {
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    "build_metadata": {
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      "id_namespace": "market_calendar",
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}