{
  "session_id": "session_data_20260409_082620",
  "total_duration_s": 917.7,
  "n_input_spans": 54,
  "session_goal": "Sew red floral fabric with sewing machine, attach red trim, sew multiple sections, and cut final edge with scissors.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 593.0,
      "description": "Sew red floral fabric edge, attach red trim, and sew subsequent sections.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 300.0,
          "description": "Position red floral fabric under presser foot, sew first edge, align and sew red trim.",
          "span_indices": [
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            1,
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            3,
            4,
            5
          ]
        },
        {
          "episode_id": 2,
          "start_time": 300.0,
          "end_time": 593.0,
          "description": "Sew red floral patterned fabric with sewing machine, cutting thread and resuming repeatedly.",
          "span_indices": [
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            7,
            8,
            9,
            10,
            11,
            12,
            13,
            14
          ]
        }
      ]
    },
    {
      "sub_goal_id": 2,
      "start_time": 593.0,
      "end_time": 917.7,
      "description": "Sew remaining red floral fabric sections, reposition, sew final seams, and cut excess edge.",
      "episodes": [
        {
          "episode_id": 3,
          "start_time": 593.0,
          "end_time": 758.2,
          "description": "Adjust sewn fabric on worktable and sew multiple sections with thread cuts.",
          "span_indices": [
            15,
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            19,
            20,
            21,
            22,
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            25,
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            27,
            28,
            29,
            30,
            31,
            32,
            33,
            34,
            35
          ]
        },
        {
          "episode_id": 4,
          "start_time": 758.2,
          "end_time": 855.2,
          "description": "Reposition and align red floral fabric, then sew additional sections with thread cuts.",
          "span_indices": [
            36,
            37,
            38,
            39,
            40,
            41,
            42,
            43,
            44
          ]
        },
        {
          "episode_id": 5,
          "start_time": 855.2,
          "end_time": 900.0,
          "description": "Smooth red floral fabric and sew final seam, then cut sewing thread.",
          "span_indices": [
            45,
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            47,
            48,
            49,
            50
          ]
        },
        {
          "episode_id": 6,
          "start_time": 900.0,
          "end_time": 917.7,
          "description": "Cut excess fabric edge with scissors and move finished fabric off the sewing machine.",
          "span_indices": [
            51,
            52,
            53
          ]
        }
      ]
    }
  ]
}