"""Author RAG Chatbot SaaS — Exception Hierarchy.

All domain exceptions inherit from AppException.
HTTP mapping is done in main.py exception handlers.
Never raise raw Exception or HTTPException from business logic.
"""


class AppException(Exception):
    """Base exception for all application errors."""

    def __init__(self, message: str = "An unexpected error occurred") -> None:
        super().__init__(message)
        self.message = message

    def __str__(self) -> str:
        return self.message