discourse/db/migrate/20160110053003_archive_syst...

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class ArchiveSystemMessagesWithNoReplies < ActiveRecord::Migration[4.2]
def up
# backdate archival of system messages send on behalf of site_contact_user
execute <<SQL
INSERT INTO user_archived_messages (user_id, topic_id, created_at, updated_at)
SELECT p.user_id, p.topic_id, p.created_at, p.updated_at
FROM posts p
JOIN topics t ON t.id = p.topic_id
LEFT JOIN user_archived_messages um ON um.user_id = p.user_id AND um.topic_id = p.topic_id
WHERE t.subtype = 'system_message' AND
t.posts_count = 1 AND
t.archetype = 'private_message' AND
um.id IS NULL AND
p.user_id IS NOT NULL AND
p.topic_id IS NOT NULL AND
p.post_number = 1
SQL
end
def down
end
end