sqxp/backend/app/utils/product_spec.py

from typing import Any, Optional


def normalize_product_spec(value: Any) -> Optional[str]:
    """空串/纯空白 -> None；否则 strip 后返回，最长 100。"""
    if value is None:
        return None
    s = str(value).strip()
    if not s:
        return None
    return s[:100]