from dataclasses import dataclass
from typing import Optional

@dataclass
class Sender:
    user_id: int
    nickname: str
    sex: str = "unknown"
    age: int = 0
    
    # 群聊特有字段
    card: Optional[str] = None      # 群名片
    area: Optional[str] = None      # 地区
    level: Optional[str] = None     # 等级
    role: Optional[str] = None      # 角色: owner/admin/member
    title: Optional[str] = None     # 专属头衔