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  "file": "2026-09-06T03.parquet",
  "generated_by": "tools/orderbook_ab/merge_ab.py",
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  "merger_git_sha": "unknown: MERGER_GIT_SHA malformed (not 40-hex)",
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      "columns": [
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        "asset_id",
        "old_tick_size",
        "new_tick_size",
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  },
  "row_count": 125246238,
  "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 g (active: c, h, e, f, g)",
  "sha256": "f9c878276bb060f3fa9889bbedaaeda59dfab99a6e1ecd3ab875cf78bb00875a",
  "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": "2026-09-06T03.witness_stats.json",
  "witnesses": "chefg",
  "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."
}
