{
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      "target_key": "2026-12-29",
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      "message_long": "Accept tier: LOW (DIRECT_STRADDLE_ONLY path)",
      "metrics": {}
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      "code": "low_tier",
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      "metrics": {}
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      "interval_to": null,
      "strike": null,
      "target_key": "2027-06-29",
      "message_short": "Rejected: insufficient_strikes",
      "message_long": "Expiry rejected: insufficient_strikes",
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    {
      "code": "low_source",
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      "interval_to": "2026-08-04",
      "strike": null,
      "target_key": "07-28\u219208-04",
      "message_short": "LOW confidence",
      "message_long": "Event confidence: LOW (baseline not robust)",
      "metrics": {
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      "interval_to": "2026-08-25",
      "strike": null,
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      "message_short": "Baseline fallback",
      "message_long": "Baseline quality: FALLBACK (edge case)",
      "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)",
      "metrics": {
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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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    "build_metadata": {
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      "source": "market_calendar.list_upcoming_events",
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}