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    "entities": {
      "subject": "20",
      "session": "RestingState",
      "task": "PicturesNaming"
    },
    "signal_summary": {
      "nchans": 257,
      "ntimes": 606584,
      "recording_duration": 606.584,
      "channel_type_counts": {
        "EEG": 257
      }
    },
    "provenance": {
      "digested_at": "2026-06-21T13:10:25.821Z"
    },
    "signal_properties": {
      "sampling_frequency": 1000
    }
  }
]