"""渠道虚拟用户 UID 映射"""


def build_channel_user_uid(channel_type: str, account_id: str) -> str:
    """按 `channel:{channel_type}:{account_id}` 格式构造渠道虚拟用户 UID。"""
    return f"channel:{channel_type}:{account_id}"


def is_channel_user(uid: str) -> bool:
    """判断给定 UID 是否为渠道虚拟用户。"""
    return uid.startswith("channel:")