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        "unit_metadata": {
          "kind": "decoded_unit_structure",
          "namespace_uri": "http://www.opcfoundation.org/UA/units/un/cefact",
          "unit_id": 20529,
          "display_name": "%",
          "description": "Invented declaration; separate property read",
          "text_limit": "Fields exceeding 2048 characters are unavailable, not truncated labels"
        },
        "source_datetime_100ns_ticks": 134353483964920000,
        "server_datetime_100ns_ticks": 134353483965870000,
        "source_picoseconds_effective_10ps_intervals": null,
        "server_picoseconds_effective_10ps_intervals": null
      }
    ],
    "connection": {
      "endpoint": "opc.tcp://localhost:64271/forge-handoff",
      "security_mode": "Basic256Sha256/SignAndEncrypt",
      "pinned_server_der_sha256": "27cfa4d4e382c058776795705005fd45cc0f53fbd722e8fd4e9aa265250c12b9",
      "client_application_uri": "urn:forge:telemetry-audit:collector",
      "asyncua_version": "2.0.1",
      "samples": 5,
      "interval_seconds": 0.05,
      "sequence_basis": "collector-generated sample index; not a PLC sequence or source replay defense",
      "access_scope": "application issues node/metadata reads; server-side read-only role must be provisioned separately",
      "timestamp_request": "Both source and server timestamps explicitly requested",
      "timestamp_scope": "CSV retains wire DateTime at 100-ns resolution via a bounded binary Read adapter; receiver clock recorded after value read",
      "wire_datetime_low_ticks": "retained_in_csv_and_integer_metadata",
      "decoded_datetime_resolution_nanoseconds": 100,
      "picosecond_scope": "Metadata retains raw 10-ps fields and effective values capped at 9999 when their DateTime is present; absent is null. Picoseconds are not added to CSV timestamps.",
      "wire_time_check_state": "CSV audit covers DateTime ticks; sub-100-ns picosecond offsets and physical clock accuracy remain outside audit scope",
      "read_codec": "forge bounded single-result Part 6 adapter for asyncua 2.0.1; transport/security unchanged",
      "metadata_scope": "unit label reads are separate from DataValue reads, not an atomic server snapshot"
    }
  }
}