from typing import Iterable, Optional


def assert_sys_user_bind_available(
    *, existing: Iterable, personnel_id: str, sys_user_id: Optional[str]
) -> None:
    uid = (sys_user_id or "").strip()
    if not uid:
        return
    for row in existing:
        if getattr(row, "del_flag", 0) == 1:
            continue
        if (getattr(row, "sys_user_id", None) or "").strip() != uid:
            continue
        if row.id == personnel_id:
            continue
        raise ValueError("该系统用户已关联其他驾押人员")