IDEAS.ENGINEERED.

def retry_delay(base_seconds: float, attempt: int) -> float:
    if attempt < 1:
        raise ValueError("attempt must be at least 1")
    return base_seconds * (2 ** (attempt - 1))

def is_retryable_exception(exc: Exception) -> bool:
    return isinstance(
        exc,
        (
            RetryableProviderError,
            TimeoutError,
            asyncio.TimeoutError,
            OperationalError,
        ),
    )

REAL CODE · PRODUCTION-AI-DOCUMENT-BACKEND · RETRY_POLICY.PY