Who has marked a particular topic as Solved

To look up who has marked a particular topic as Solved:

-- [params]
-- topic_id :topic_id 

SELECT 
   target_topic_id, 
   acting_user_id, 
   created_at::date
FROM user_actions
WHERE target_topic_id = :topic_id
AND action_type = 15
ORDER BY created_at DESC
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