How can I get a list of when robots were first added to the domain

Document ID : KB000124836
Last Modified Date : 16/01/2019
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Question:
How can I get a list of when robots were first added to the domain?
Answer:
SELECT 
cd.time_created, 
cd.dev_name 
FROM cm_device cd 
JOIN cm_nimbus_robot nr ON nr.dev_id=cd.dev_id 
ORDER BY cd.time_created desc;