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mastodon/db/views/follow_recommendations_v01.sql

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SELECT
account_id,
sum(rank) AS rank,
array_agg(reason) AS reason
FROM (
SELECT
accounts.id AS account_id,
count(follows.id) / (1.0 + count(follows.id)) AS rank,
'most_followed' AS reason
FROM follows
INNER JOIN accounts ON accounts.id = follows.target_account_id
INNER JOIN users ON users.account_id = follows.account_id
WHERE users.current_sign_in_at >= (now() - interval '30 days')
AND accounts.suspended_at IS NULL
AND accounts.moved_to_account_id IS NULL
AND accounts.silenced_at IS NULL
AND accounts.locked = 'f'
AND accounts.discoverable = 't'
GROUP BY accounts.id
HAVING count(follows.id) >= 5
UNION ALL
SELECT accounts.id AS account_id,
sum(reblogs_count + favourites_count) / (1.0 + sum(reblogs_count + favourites_count)) AS rank,
'most_interactions' AS reason
FROM status_stats
INNER JOIN statuses ON statuses.id = status_stats.status_id
INNER JOIN accounts ON accounts.id = statuses.account_id
WHERE statuses.id >= ((date_part('epoch', now() - interval '30 days') * 1000)::bigint << 16)
AND accounts.suspended_at IS NULL
AND accounts.moved_to_account_id IS NULL
AND accounts.silenced_at IS NULL
AND accounts.locked = 'f'
AND accounts.discoverable = 't'
GROUP BY accounts.id
HAVING sum(reblogs_count + favourites_count) >= 5
) t0
GROUP BY account_id
ORDER BY rank DESC