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lemmy/migrations/2023-08-02-174444_fix-timezones/up.sql

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DROP FUNCTION IF EXISTS hot_rank CASCADE;
SET timezone = 'UTC';
-- Allow ALTER TABLE ... SET DATA TYPE changing between timestamp and timestamptz to avoid a table rewrite when the session time zone is UTC (Noah Misch)
-- In the UTC time zone, these two data types are binary compatible.
ALTER TABLE community_moderator
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community_follower
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE person_ban
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community_person_ban
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community_person_ban
ALTER COLUMN expires TYPE timestamptz
USING expires;
ALTER TABLE person
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE person
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE person
ALTER COLUMN last_refreshed_at TYPE timestamptz
USING last_refreshed_at;
ALTER TABLE person
ALTER COLUMN ban_expires TYPE timestamptz
USING ban_expires;
ALTER TABLE post_like
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE post_saved
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE post_read
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE comment_like
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE comment_saved
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE comment
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE comment
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE mod_remove_post
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_lock_post
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_remove_comment
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_remove_community
ALTER COLUMN expires TYPE timestamptz
USING expires;
ALTER TABLE mod_remove_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_ban_from_community
ALTER COLUMN expires TYPE timestamptz
USING expires;
ALTER TABLE mod_ban_from_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_ban
ALTER COLUMN expires TYPE timestamptz
USING expires;
ALTER TABLE mod_ban
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_add_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE mod_add
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE person_mention
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE mod_feature_post
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE password_reset_request
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE private_message
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE private_message
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE sent_activity
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE received_activity
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE community
ALTER COLUMN last_refreshed_at TYPE timestamptz
USING last_refreshed_at;
ALTER TABLE post
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE post
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE comment_report
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE comment_report
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE post_report
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE post_report
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE post_aggregates
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE post_aggregates
ALTER COLUMN newest_comment_time_necro TYPE timestamptz
USING newest_comment_time_necro;
ALTER TABLE post_aggregates
ALTER COLUMN newest_comment_time TYPE timestamptz
USING newest_comment_time;
ALTER TABLE comment_aggregates
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community_block
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE community_aggregates
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE mod_transfer_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE person_block
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE local_user
ALTER COLUMN validator_time TYPE timestamptz
USING validator_time;
ALTER TABLE admin_purge_person
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE email_verification
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE admin_purge_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE admin_purge_post
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE admin_purge_comment
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE registration_application
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE mod_hide_community
ALTER COLUMN when_ TYPE timestamptz
USING when_;
ALTER TABLE site
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE site
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE site
ALTER COLUMN last_refreshed_at TYPE timestamptz
USING last_refreshed_at;
ALTER TABLE comment_reply
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE person_post_aggregates
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE private_message_report
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE private_message_report
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE local_site
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE local_site
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE federation_allowlist
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE federation_allowlist
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE federation_blocklist
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE federation_blocklist
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE local_site_rate_limit
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE local_site_rate_limit
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE person_follower
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE tagline
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE tagline
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE custom_emoji
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE custom_emoji
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE instance
ALTER COLUMN published TYPE timestamptz
USING published;
ALTER TABLE instance
ALTER COLUMN updated TYPE timestamptz
USING updated;
ALTER TABLE captcha_answer
ALTER COLUMN published TYPE timestamptz
USING published;
-- same as before just with time zone argument
CREATE OR REPLACE FUNCTION hot_rank (score numeric, published timestamp with time zone)
RETURNS integer
AS $$
DECLARE
hours_diff numeric := EXTRACT(EPOCH FROM (now() - published)) / 3600;
BEGIN
IF (hours_diff > 0) THEN
RETURN floor(10000 * log(greatest (1, score + 3)) / power((hours_diff + 2), 1.8))::integer;
ELSE
-- if the post is from the future, set hot score to 0. otherwise you can game the post to
-- always be on top even with only 1 vote by setting it to the future
RETURN 0;
END IF;
END;
$$
LANGUAGE plpgsql
IMMUTABLE PARALLEL SAFE;