{
  "session_id": "session_data_20260407_185508",
  "total_duration_s": 378.1,
  "n_input_spans": 48,
  "session_goal": "Sew pink floral fabric using a sewing machine, repositioning, and cutting thread with scissors.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 378.1,
      "description": "Sew pink floral fabric pieces with sewing machine, reposition, and cut thread.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 71.3,
          "description": "Position pink floral fabric under presser foot, sew, and cut thread with scissors.",
          "span_indices": [
            0,
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            3,
            4
          ]
        },
        {
          "episode_id": 2,
          "start_time": 71.3,
          "end_time": 201.3,
          "description": "Fold, align, and sew pink floral fabric pieces, then cut thread.",
          "span_indices": [
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            6,
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            9,
            10,
            11,
            12,
            13,
            14,
            15,
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            17,
            18
          ]
        },
        {
          "episode_id": 3,
          "start_time": 201.3,
          "end_time": 300.0,
          "description": "Reposition, fold, align, and sew pink floral fabric pieces, then adjust.",
          "span_indices": [
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            21,
            22,
            23,
            24,
            25,
            26,
            27
          ]
        },
        {
          "episode_id": 4,
          "start_time": 300.0,
          "end_time": 327.2,
          "description": "Adjust fabric, sew edge, pick up scissors, cut thread, and place scissors.",
          "span_indices": [
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            31,
            32,
            33
          ]
        },
        {
          "episode_id": 5,
          "start_time": 327.2,
          "end_time": 378.1,
          "description": "Pull, rearrange, fold, align, sew pieces, cut thread, inspect seam, and adjust.",
          "span_indices": [
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            35,
            36,
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            38,
            39,
            40,
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            47
          ]
        }
      ]
    }
  ]
}