{
  "session_id": "session_data_20260404_202918",
  "total_duration_s": 903.0,
  "n_input_spans": 66,
  "session_goal": "Cut light blue and striped blue fabric with scissors, sew fabric pairs, a long strip, embroidered fabric, and patterned blue fabric with sewing machine.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 225.0,
      "description": "Cut blue fabric pieces with pink scissors and sew pairs with sewing machine.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 80.0,
          "description": "Cut light blue and striped blue fabric with pink scissors on sewing table.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 2,
          "start_time": 80.0,
          "end_time": 225.0,
          "description": "Sew multiple blue fabric pairs with sewing machine and trim excess thread.",
          "span_indices": [
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          ]
        }
      ]
    },
    {
      "sub_goal_id": 2,
      "start_time": 225.0,
      "end_time": 721.9,
      "description": "Sew long strip, embroidered, and patterned blue fabric with sewing machine.",
      "episodes": [
        {
          "episode_id": 3,
          "start_time": 225.0,
          "end_time": 300.0,
          "description": "Prepare and sew folded edge of long blue fabric strip with sewing machine.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 4,
          "start_time": 300.0,
          "end_time": 491.0,
          "description": "Sew edges of blue embroidered and plain fabric with red-handled scissors.",
          "span_indices": [
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            39
          ]
        },
        {
          "episode_id": 5,
          "start_time": 491.0,
          "end_time": 600.0,
          "description": "Gather ruffle and sew final edges of blue embroidered fabric with sewing machine.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 6,
          "start_time": 600.0,
          "end_time": 721.9,
          "description": "Sew blue patterned fabric with sewing machine and observe workspace.",
          "span_indices": [
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            64,
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          ]
        }
      ]
    }
  ]
}