I figured out the query to run in Data Explorer, it is:
SELECT term, count(*) searches,
sum(case when search_result_id is not null then 1 else 0 end) clicks,
round(sum(case when search_result_id is not null then 1 else 0 end) * 100.0 / count(*), 1) as ctr
from search_logs
where created_at > current_timestamp - interval '30' day
group by term
order by count(*) desc
So my final, final question is: is there a way in the Automation, to have this query run and turn the results into a CSV attached to the email for the recipients instead of the results posted in the body of the email?