"""Domain entity representing system health."""

from __future__ import annotations

from dataclasses import dataclass


@dataclass(frozen=True, slots=True)
class HealthStatus:
    """Immutable representation of the service health state."""

    status: str = "ok"

    def to_dict(self) -> dict[str, str]:
        """Serialize the status for transport layers."""
        return {"status": self.status}