discourse/app/jobs/onceoff/retro_recent_time_read.rb

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module Jobs
class RetroRecentTimeRead < Jobs::Onceoff
def execute_onceoff(args)
# update past records by evenly distributing total time reading among each post read
sql = <<~SQL
UPDATE user_visits uv1
SET time_read = (
SELECT (
uv1.posts_read
/ (SELECT CAST(sum(uv2.posts_read) AS FLOAT) FROM user_visits uv2 where uv2.user_id = uv1.user_id)
* COALESCE((SELECT us.time_read FROM user_stats us WHERE us.user_id = uv1.user_id), 0)
)
)
WHERE EXISTS (SELECT 1 FROM user_stats stats WHERE stats.user_id = uv1.user_id AND stats.posts_read_count > 0 LIMIT 1)
AND EXISTS (SELECT 1 FROM user_visits visits WHERE visits.user_id = uv1.user_id AND visits.posts_read > 0 LIMIT 1)
SQL
DB.exec(sql)
end
end
end