"Unknown user" rev on zhwikisource

This query is marked as a draft This query has been published by Krinkle.

See https://phabricator.wikimedia.org/T203913.

SQL

USE frrwiki_p;
SELECT
 COUNT(*) as _count,
 LEFT(rev_timestamp, 8) as _day
FROM `revision_userindex`
WHERE rev_timestamp LIKE '2018%' OR rev_timestamp LIKE '2019%' 
GROUP BY _day
ORDER BY `rev_timestamp`;

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