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      "rows_by_domain": {
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      "rows_merged": 3112,
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  "file": "2026-09-03T15.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
  "hour": "2026-09-03/15",
  "hour_utc": "2026-09-03T15:00:00+00:00",
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  "merger_git_sha": "unknown: MERGER_GIT_SHA malformed (not 40-hex)",
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      "columns": [
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        "outcomes",
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        "slug",
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      "columns": [
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      "columns": [
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        "sequence",
        "timestamp",
        "market",
        "asset_id",
        "old_tick_size",
        "new_tick_size",
        "witness_set",
        "arrival_skew",
        "source_witness"
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      "max_sequence": 281490978863447,
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      "order_by": [
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      "row_count": 3112,
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      "sha256": "edfd2fb942bd6f00c9b2411ea55aef1ec58d086decfcf9c0a0b0b39c407239d0"
    }
  },
  "row_count": 115006159,
  "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the LAST ACTIVE domain's values -- for this hour, domain e (active: b, c, h, e)",
  "sha256": "8275430c8a274f6ee3e16a41bfd560b3e33dc752d2ae63d9eff88d1da3ff5777",
  "verification": {
    "note": "A range digest certifies BYTES. That those bytes are that product comes from this manifest and is cross-checkable against the Parquet footer, which is inside the whole-file sha256.",
    "primary": "sha256sum <file> == .sha256",
    "secondary": "curl -r <start>-<end-1> <url> | sha256sum == .products.<name>.sha256"
  },
  "witness_stats": "2026-09-03T15.witness_stats.json",
  "witnesses": "bche",
  "served_verbatim": true,
  "served_note": "This hour is the merger's union file, published byte for byte. Hours before the era cutover are rebuilt here from the seven product files and carry one column fewer."
}
