{
  "version": {
    "major": 1,
    "minor": 0,
    "patch": 0
  },
  "metadata": {
    "session_id": "ruchy-session-1756789037",
    "created_at": "2025-09-02T04:57:17.122776092+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": 118157,
      "event": {
        "Input": {
          "text": "\"hello\".len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 2,
      "timestamp_ns": 167264,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"5\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 3,
      "timestamp_ns": 172211,
      "event": {
        "Input": {
          "text": "\"world\".upper()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 4,
      "timestamp_ns": 179794,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"WORLD\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 5,
      "timestamp_ns": 182695,
      "event": {
        "Input": {
          "text": "\"TEST\".lower()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 6,
      "timestamp_ns": 188569,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"test\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 7,
      "timestamp_ns": 191632,
      "event": {
        "Input": {
          "text": "\"  whitespace  \".trim()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 8,
      "timestamp_ns": 197132,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"whitespace\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 9,
      "timestamp_ns": 199092,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 10,
      "timestamp_ns": 201244,
      "event": {
        "Input": {
          "text": "\"hello\" + \" \" + \"world\"",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 11,
      "timestamp_ns": 212780,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"hello world\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 12,
      "timestamp_ns": 215861,
      "event": {
        "Input": {
          "text": "\"test\".replace(\"e\", \"a\")",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 13,
      "timestamp_ns": 223181,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"tast\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 14,
      "timestamp_ns": 225103,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 15,
      "timestamp_ns": 226614,
      "event": {
        "Input": {
          "text": "\"one,two,three\".split(\",\")",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 16,
      "timestamp_ns": 237865,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[\\\"one\\\", \\\"two\\\", \\\"three\\\"]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 17,
      "timestamp_ns": 240801,
      "event": {
        "Input": {
          "text": "\"a-b-c-d\".split(\"-\")",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 18,
      "timestamp_ns": 249908,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[\\\"a\\\", \\\"b\\\", \\\"c\\\", \\\"d\\\"]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 19,
      "timestamp_ns": 251986,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 20,
      "timestamp_ns": 253729,
      "event": {
        "Input": {
          "text": "let sentence = \"The quick brown fox\"",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 21,
      "timestamp_ns": 272184,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"The quick brown fox\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 22,
      "timestamp_ns": 274866,
      "event": {
        "Input": {
          "text": "sentence.len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 23,
      "timestamp_ns": 282659,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"19\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 24,
      "timestamp_ns": 285380,
      "event": {
        "Input": {
          "text": "sentence.upper()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 25,
      "timestamp_ns": 291726,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"THE QUICK BROWN FOX\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 26,
      "timestamp_ns": 294419,
      "event": {
        "Input": {
          "text": "sentence.split(\" \")",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 27,
      "timestamp_ns": 303479,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"[\\\"The\\\", \\\"quick\\\", \\\"brown\\\", \\\"fox\\\"]\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 28,
      "timestamp_ns": 305326,
      "event": {
        "Input": {
          "text": "",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 29,
      "timestamp_ns": 306078,
      "event": {
        "Input": {
          "text": "\"\".len()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 30,
      "timestamp_ns": 314305,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"0\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 31,
      "timestamp_ns": 316512,
      "event": {
        "Input": {
          "text": "\" \".trim()",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 32,
      "timestamp_ns": 323192,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    },
    {
      "id": 33,
      "timestamp_ns": 326734,
      "event": {
        "Input": {
          "text": "\"single\".replace(\"x\", \"y\")",
          "mode": "Interactive"
        }
      },
      "causality": []
    },
    {
      "id": 34,
      "timestamp_ns": 336390,
      "event": {
        "Output": {
          "result": {
            "Success": {
              "value": "String(\"\\\"single\\\"\")"
            }
          },
          "stdout": [],
          "stderr": []
        }
      },
      "causality": []
    }
  ],
  "checkpoints": {}
}