I also tried to do this via subquery, but MySQL apparently doesn't support 
subqueries with LIMIT:

NotSupportedError: (NotSupportedError) (1235, "This version of MySQL 
doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'") 'DELETE FROM 
twitter_tweets WHERE twitter_tweets.uid IN (SELECT twitter_tweets.uid 
\nFROM twitter_tweets \nWHERE twitter_tweets.created_at < 
date_sub(UTC_TIMESTAMP, INTERVAL 90 DAY) ORDER BY twitter_tweets.created_at 
ASC \n LIMIT %s)' (2,)

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