{
  "session_id": "session_data_20260406_090952",
  "total_duration_s": 1137.2,
  "n_input_spans": 93,
  "session_goal": "Sew yellow fabric garment pieces with sewing machine, attach binding strips, trim thread and excess fabric with pink scissors.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 148.0,
      "description": "Sew yellow fabric, then fold and trim edge for binding.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 98.0,
          "description": "Sew yellow fabric with sewing machine and cut thread with pink scissors.",
          "span_indices": [
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          "description": "Fold and trim edge of yellow fabric for binding with pink scissors.",
          "span_indices": [
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          ]
        }
      ]
    },
    {
      "sub_goal_id": 2,
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      "end_time": 600.0,
      "description": "Sew binding strips onto yellow fabric, adjust seams, and trim with pink scissors.",
      "episodes": [
        {
          "episode_id": 3,
          "start_time": 148.0,
          "end_time": 153.0,
          "description": "Move scrap yellow fabric pieces off sewing table.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 4,
          "start_time": 153.0,
          "end_time": 289.0,
          "description": "Sew binding strip onto main yellow fabric with sewing machine.",
          "span_indices": [
            16,
            17,
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          ]
        },
        {
          "episode_id": 5,
          "start_time": 289.0,
          "end_time": 300.0,
          "description": "Adjust and inspect sewn binding strip on fabric.",
          "span_indices": [
            20,
            21
          ]
        },
        {
          "episode_id": 6,
          "start_time": 300.0,
          "end_time": 414.9,
          "description": "Sew additional binding strips and cut thread with pink scissors.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 7,
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          "end_time": 481.7,
          "description": "Align new strips, sew, and trim loose threads with pink scissors.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 8,
          "start_time": 481.7,
          "end_time": 546.0,
          "description": "Sew fabric after adjusting machine and repositioning yellow fabric.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 9,
          "start_time": 546.0,
          "end_time": 600.0,
          "description": "Finish main fabric piece by sewing and cutting thread with scissors.",
          "span_indices": [
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          ]
        }
      ]
    },
    {
      "sub_goal_id": 3,
      "start_time": 600.0,
      "end_time": 970.5,
      "description": "Sew yellow garment piece sides, attach new fabric piece, and finish seams.",
      "episodes": [
        {
          "episode_id": 10,
          "start_time": 600.0,
          "end_time": 728.0,
          "description": "Sew garment piece sides with sewing machine.",
          "span_indices": [
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          ]
        },
        {
          "episode_id": 11,
          "start_time": 728.0,
          "end_time": 773.0,
          "description": "Adjust edge, cut excess, and sew next seam on garment piece.",
          "span_indices": [
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            74
          ]
        },
        {
          "episode_id": 12,
          "start_time": 773.0,
          "end_time": 900.0,
          "description": "Sew new yellow fabric piece with trim and place onto fabric stack.",
          "span_indices": [
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        },
        {
          "episode_id": 13,
          "start_time": 900.0,
          "end_time": 970.5,
          "description": "Guide yellow fabric through sewing machine, adjust, and cut thread with pink scissors.",
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        }
      ]
    }
  ]
}