"""Custom exceptions module."""


class PermanentError(Exception):
    """Base class for permanent errors (non-retriable).

    Permanent errors represent failures that cannot be resolved by retrying
    the operation, such as validation errors, missing data, or logic errors.
    """


class TransientError(Exception):
    """Retriable transient error (network, throttling, temporary failures).

    Transient errors represent temporary failures that may succeed if retried,
    such as network timeouts, database connection issues, or service throttling.
    """