{
  "session_id": "session_data_20260409_153617",
  "total_duration_s": 1455.1,
  "n_input_spans": 19,
  "session_goal": "Knit yellow fabric with knitting needles and yellow yarn, inspecting the fabric for evenness and length.",
  "sub_goals": [
    {
      "sub_goal_id": 1,
      "start_time": 0.0,
      "end_time": 1455.1,
      "description": "Knit yellow fabric with knitting needles, inspecting and adjusting yarn periodically.",
      "episodes": [
        {
          "episode_id": 1,
          "start_time": 0.0,
          "end_time": 234.8,
          "description": "Knit yellow fabric with knitting needles and adjust yellow yarn.",
          "span_indices": [
            0,
            1,
            2
          ]
        },
        {
          "episode_id": 2,
          "start_time": 234.8,
          "end_time": 300.0,
          "description": "Examine knitted yellow fabric and resume knitting.",
          "span_indices": [
            3,
            4
          ]
        },
        {
          "episode_id": 3,
          "start_time": 300.0,
          "end_time": 990.0,
          "description": "Knit yellow fabric with knitting needles continuously.",
          "span_indices": [
            5,
            6,
            7
          ]
        },
        {
          "episode_id": 4,
          "start_time": 990.0,
          "end_time": 1152.0,
          "description": "Inspect knitted yellow fabric and continue knitting.",
          "span_indices": [
            8,
            9
          ]
        },
        {
          "episode_id": 5,
          "start_time": 1152.0,
          "end_time": 1200.0,
          "description": "Inspect knitted yellow fabric, adjust yarn, and knit.",
          "span_indices": [
            10,
            11
          ]
        },
        {
          "episode_id": 6,
          "start_time": 1200.0,
          "end_time": 1287.2,
          "description": "Knit yellow fabric to form base and inspect evenness.",
          "span_indices": [
            12,
            13
          ]
        },
        {
          "episode_id": 7,
          "start_time": 1287.2,
          "end_time": 1329.0,
          "description": "Knit yellow fabric to add length and inspect length progress.",
          "span_indices": [
            14,
            15
          ]
        },
        {
          "episode_id": 8,
          "start_time": 1329.0,
          "end_time": 1455.1,
          "description": "Knit yellow fabric to extend piece, adjust and inspect dimensions, add final stitches.",
          "span_indices": [
            16,
            17,
            18
          ]
        }
      ]
    }
  ]
}