from dataclasses import dataclass
from datetime import datetime


@dataclass
class User:
    id: int
    email: str
    password_hash: str
    name: str
    role: str
    created_at: datetime

    def is_admin(self) -> bool:
        return self.role == 'admin'

    def is_operator(self) -> bool:
        return self.role == 'operator'

    def is_viewer(self) -> bool:
        return self.role == 'viewer'