class_docstr: Data model for AutoGen Chat Session
code: def __post_init__(self):
      if self.timestamp is None:
          self.timestamp = datetime.now().isoformat()
      if self.id is None:
          self.id = str(uuid.uuid4())
  
imports: import uuid
  from datetime import datetime
  from typing import Any, Callable, Dict, List, Literal, Optional, Union
  from pydantic.dataclasses import dataclass
  from dataclasses import asdict, field
label_desc: Use image node_id 1 for calling the Session obj's underlying member method code with example usage: obj.__post_init__() without return types