{
  "version": {
    "major": 1,
    "minor": 0,
    "patch": 0
  },
  "metadata": {
    "session_id": "ruchy-session-1756789079",
    "created_at": "2025-09-02T04:57:59.449536805+00:00",
    "ruchy_version": "1.30.1",
    "student_id": null,
    "assignment_id": null,
    "tags": [
      "interactive"
    ]
  },
  "environment": {
    "seed": 0,
    "feature_flags": [],
    "resource_limits": {
      "heap_mb": 100,
      "stack_kb": 8192,
      "cpu_ms": 5000
    }
  },
  "timeline": [
    {
      "id": 1,
      "timestamp_ns": 112521,
      "event": {
        "Input": {
          "text": "[1, 2, 3].len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 2,
      "timestamp_ns": 170800,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"3\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 3,
      "timestamp_ns": 175230,
      "event": {
        "Input": {
          "text": "[1, 2, 3, 4, 5].head()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 4,
      "timestamp_ns": 183262,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"1\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 5,
      "timestamp_ns": 186115,
      "event": {
        "Input": {
          "text": "[\"a\", \"b\", \"c\"].len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 6,
      "timestamp_ns": 195226,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"3\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 7,
      "timestamp_ns": 197293,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 8,
      "timestamp_ns": 199080,
      "event": {
        "Input": {
          "text": "let numbers = [10, 20, 30, 40, 50]",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 9,
      "timestamp_ns": 218327,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[10, 20, 30, 40, 50]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 10,
      "timestamp_ns": 221853,
      "event": {
        "Input": {
          "text": "numbers.len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 11,
      "timestamp_ns": 228854,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"5\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 12,
      "timestamp_ns": 231198,
      "event": {
        "Input": {
          "text": "numbers.head()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 13,
      "timestamp_ns": 236740,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"10\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 14,
      "timestamp_ns": 238396,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 15,
      "timestamp_ns": 239163,
      "event": {
        "Input": {
          "text": "[].len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 16,
      "timestamp_ns": 243558,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"0\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 17,
      "timestamp_ns": 245087,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 18,
      "timestamp_ns": 247360,
      "event": {
        "Input": {
          "text": "let mixed = [1, \"two\", 3.0, true]",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 19,
      "timestamp_ns": 267541,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[1, \\\"two\\\", 3, true]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 20,
      "timestamp_ns": 270067,
      "event": {
        "Input": {
          "text": "mixed.len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 21,
      "timestamp_ns": 275811,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"4\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 22,
      "timestamp_ns": 277336,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 23,
      "timestamp_ns": 278492,
      "event": {
        "Input": {
          "text": "[[1, 2], [3, 4]].len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 24,
      "timestamp_ns": 294275,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"2\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 25,
      "timestamp_ns": 297098,
      "event": {
        "Input": {
          "text": "[[1, 2], [3, 4]].head()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 26,
      "timestamp_ns": 306648,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[1, 2]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 27,
      "timestamp_ns": 308239,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 28,
      "timestamp_ns": 309166,
      "event": {
        "Input": {
          "text": "let empty = []",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 29,
      "timestamp_ns": 318222,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 30,
      "timestamp_ns": 320494,
      "event": {
        "Input": {
          "text": "empty.len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 31,
      "timestamp_ns": 326085,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"0\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 32,
      "timestamp_ns": 327537,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 33,
      "timestamp_ns": 328733,
      "event": {
        "Input": {
          "text": "[1, 2, 3, 4, 5].sum()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 34,
      "timestamp_ns": 338015,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"15\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 35,
      "timestamp_ns": 341194,
      "event": {
        "Input": {
          "text": "[10, 20, 30].sum()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 36,
      "timestamp_ns": 348171,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"60\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    }
  ],
  "checkpoints": {}
}