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+ "session": "EgoMotionActions/20260921/P31/20260921_033516_session58",
+ "session_id": "20260921_033516_session58",
+ "primitive": "P31",
+ "batch": "20260921",
+ "participant": "yanyitong",
+ "participant_source": "manifest",
+ "device_ids": {
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+  "left": "cc5681142208e29a",
+  "right": "60a6f081bbe60b0d"
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+ "generated_at_utc": "2026-10-14T11:21:09.260723+00:00",
+ "generated_by": "scripts/sync_dataset.py",
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+  "mocap_time": "frame_index / rate (Nokov Timestamp column is not a clock; kept as source_timestamp_ms)"
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+  "model": "offset (median of windows)",
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+  "gyro": "rad/s (65.536 LSB/dps)",
+  "mag": "raw counts, scale unconfirmed (data suggests 163.84 LSB/uT, see knowledge_base sanity doc)",
+  "quaternions": "xyzw, Nokov global"
+ },
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+  "date": "2026-09-08"
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+   "WARN S_INDEX_STALE",
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