"""Manual new/old choice, independent of the calculated product-age field."""
from services.db import query


def snapshot_new_old(product_code, saved_value=None):
    """Preserve an existing pending snapshot during quantity/remark edits."""
    if saved_value in ('是', '否'):
        return saved_value
    rows = query('SELECT planning_new_old FROM products WHERE product_code=%s', (product_code,))
    return '是' if rows and rows[0].get('planning_new_old') == '是' else '否'