Why is there no record of who added or removed slow mode?

You can query this information using Data Explorer. I think this should work - you’ll need to specify start and end dates. It should return the topic, the slow mode time in seconds, when the topic slow mode was updated, and who did it:

-- [params]
-- date :start_date
-- date :end_date

SELECT 
    t.id AS topic_id,
    t.title,
    t.slow_mode_seconds,
    t.updated_at,
    u.id AS user_id,
    u.username
FROM 
    topics t
JOIN 
    users u ON t.user_id = u.id
WHERE 
    t.slow_mode_seconds > 0
    AND t.updated_at BETWEEN :start_date AND :end_date
ORDER BY 
    t.updated_at DESC
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