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"union-staging", "boundary_guard": "cache", "bytes": 1548292299, "file": "2026-09-26T19.parquet", "generated_by": "tools/orderbook_ab/merge_ab.py", "hour": "2026-09-26/19", "hour_utc": "2026-09-26T19:00:00+00:00", "layout": "union-event-sorted-v1", "max_sequence": 357473220425878634, "merger_git_sha": "fcbb28046152741ae3754e951659977da4c8b36e", "min_sequence": 10414574505986461, "products": { "best_bid_ask": { "byte_range": [ 4, 145722756 ], "columns": [ "timestamp_received", "sequence", "timestamp", "market", "asset_id", "best_bid", "best_ask", "spread", "witness_set", "arrival_skew", "source_witness" ], "max_sequence": 357473220425878074, "min_sequence": 10414574505986463, "order_by": [ "market", "asset_id", "timestamp", "sequence" ], "row_count": 12714300, "row_groups": [ 0, 48 ], "sha256": "3e071130ad40b04f842280c7f6815d397c362e4a11fecebfa6dc405c90ff00d7" }, "book": { "byte_range": [ 145722756, 307380335 ], "columns": [ "timestamp_received", "sequence", "timestamp", "market", 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"side", "best_bid", "best_ask", "witness_set", "arrival_skew", "source_witness" ], "max_sequence": 357473220425878116, "min_sequence": 10414574505986461, "order_by": [ "market", "asset_id", "timestamp", "sequence" ], "row_count": 120557828, "row_groups": [ 76, 535 ], "sha256": "1801d686fc01270810c0ed3805b32a5057527d79f99767710d534d780e80f885" }, "tick_size_change": { "byte_range": [ 1546387255, 1546708349 ], "columns": [ "timestamp_received", "sequence", "timestamp", "market", "asset_id", "old_tick_size", "new_tick_size", "witness_set", "arrival_skew", "source_witness" ], "max_sequence": 357473220425531617, "min_sequence": 10414574513603592, "order_by": [ "market", "asset_id", "timestamp", "sequence" ], "row_count": 8736, "row_groups": [ 536, 536 ], "sha256": "1493ec16069f798ac0cc6bb74a98ae2af2265987298d731880c33275c88a536a" } }, "row_count": 139470260, "sequence_note": "sequence and timestamp_received are collector-local provenance; where domains carry the same row, the merge keeps the EARLIEST-RECEIVED copy, equal arrivals breaking by registry order (active: c, h, i, k). The winner is per row, not per hour -- each row names its own in source_witness", "sha256": "619d8c3255c7f445be06c07020bb305e1240f8e02bd6fd91d4658f991f12af31", "skipped_witnesses": { "g": { "alive": false, "listed_utc": "2026-09-26T22:52:03.892975Z", "newest_upload": "2026-09-25T15:20:05.378000Z", "reason": "not_staged" } }, "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 == .sha256", "secondary": "curl -r - | sha256sum == .products..sha256" }, "witness_stats": "2026-09-26T19.witness_stats.json", "witnesses": "chik", "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." }