10k random mainspace pages

SQL

SET @username = 'Asilvering';

WITH ns(ns_n, ns_s) AS (VALUES (-2, 'Media:'), (-1, 'Special:'), (0, ''), (1, 'Talk:'), (2, 'User:'), (3, 'User talk:'), (4,
  'Wikipedia:'), (5, 'Wikipedia talk:'), (6, ':File:'), (7, 'File talk:'), (8, 'MediaWiki:'), (9, 'MediaWiki talk:'), (10, 'Template:'),
  (11,  'Template talk:'), (12, 'Help:'), (13, 'Help talk:'), (14, ':Category:'), (15, 'Category talk:'), (100, 'Portal:'), (101,
  'Portal talk:'), (118, 'Draft:'), (119, 'Draft talk:'), (710, 'TimedText:'), (711, 'TimedText talk:'), (828, 'Module:'), (829,
  'Module talk:'), (2300, 'Gadget:'), (2301, 'Gadget talk:'), (2302, 'Gadget definition:'), (2303, 'Gadget definition talk:')),
normal_entries (n_ts, n_namespace, n_title, n_exists, n_create_comment, n_del_comments) AS
(
  SELECT crl.log_timestamp,
         crl.log_namespace,
         crl.log_title,
         EXISTS(SELECT 1 FROM page WHERE page_namespace = crl.log_namespace AND page_title = crl.log_title),
         crc.comment_text,
         GROUP_CONCAT(CONCAT(del.log_action, ':', delc.comment_text) SEPARATOR ' // ')
  FROM logging_userindex AS crl
  JOIN actor_logging ON actor_id = log_actor
  JOIN comment_logging AS crc ON crc.comment_id = crl.log_comment_id
  JOIN logging_logindex del
    ON del.log_namespace = crl.log_namespace
   AND del.log_title = crl.log_title
   AND del.log_type = 'delete'
   AND del.log_action != 'restore'
   AND del.log_timestamp > crl.log_timestamp
  JOIN comment_logging AS delc ON delc.comment_id = del.log_comment_id
  WHERE crl.log_type = 'create'
    AND actor_name = @username
  GROUP BY crl.log_timestamp, crl.log_namespace
),
halfbaked AS
(
SELECT * FROM normal_entries
UNION
SELECT log_timestamp,
       log_namespace,
       log_title,
       0,
       comment_text,
       NULL
FROM logging_userindex
JOIN actor_logging ON actor_id = log_actor
JOIN comment_logging ON comment_id = log_comment_id
LEFT JOIN page ON page_namespace = log_namespace AND page_title = log_title
LEFT JOIN normal_entries ON n_namespace = log_namespace AND n_title = log_title
WHERE log_type = 'create'
  AND actor_name = @username
  AND page_id IS NULL
  AND n_ts IS NULL
ORDER BY n_ts ASC
)
SELECT n_ts,
       CONCAT(COALESCE(ns_s, '?:'), n_title) AS title,
       n_exists,
       n_create_comment,
       n_del_comments
FROM halfbaked
LEFT JOIN ns ON ns_n = n_namespace;
SQL

Checking query status...
