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def get_blocklist_ids(user_id: int) -> list[int]:

    data = query(
        'select blocker, blocked from blocked_list where blocker=?',
        (user_id,)
        )
    block_pairs = (Blocked.read_from_query(*row) for row in data)
    blocked_ids = [block_pair.blocked for block_pair in block_pairs]

    return blocked_ids