lemmy/migrations/2023-12-19-210053_tolerable.../up.sql

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-- Change triggers to run once per statement instead of once per row
-- post_aggregates_post trigger doesn't need to handle deletion because the post_id column has ON DELETE CASCADE
CREATE OR REPLACE FUNCTION post_aggregates_post ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
INSERT INTO post_aggregates (post_id, published, newest_comment_time, newest_comment_time_necro, community_id, creator_id, instance_id)
SELECT
id,
published,
published,
published,
community_id,
creator_id,
(
SELECT
community.instance_id
FROM
community
WHERE
community.id = community_id
LIMIT 1)
FROM
new_post;
RETURN NULL;
END
$$;
CREATE OR REPLACE FUNCTION community_aggregates_post_count_insert ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
UPDATE
community_aggregates
SET
posts = posts + post_group.count
FROM (
SELECT
community_id,
count(*)
FROM
new_post
GROUP BY
community_id) post_group
WHERE
community_aggregates.community_id = post_group.community_id;
RETURN NULL;
END
$$;
CREATE OR REPLACE FUNCTION person_aggregates_post_insert ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
UPDATE
person_aggregates
SET
post_count = post_count + post_group.count
FROM (
SELECT
creator_id,
count(*)
FROM
new_post
GROUP BY
creator_id) post_group
WHERE
person_aggregates.person_id = post_group.creator_id;
RETURN NULL;
END
$$;
CREATE OR REPLACE TRIGGER post_aggregates_post
AFTER INSERT ON post REFERENCING NEW TABLE AS new_post
FOR EACH STATEMENT
EXECUTE PROCEDURE post_aggregates_post ();
-- Don't run old trigger for insert
CREATE OR REPLACE TRIGGER community_aggregates_post_count
AFTER DELETE OR UPDATE OF removed,
deleted ON post
FOR EACH ROW
EXECUTE PROCEDURE community_aggregates_post_count ();
CREATE OR REPLACE TRIGGER community_aggregates_post_count_insert
AFTER INSERT ON post REFERENCING NEW TABLE AS new_post
FOR EACH STATEMENT
EXECUTE PROCEDURE community_aggregates_post_count_insert ();
CREATE OR REPLACE FUNCTION site_aggregates_post_update ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (was_restored_or_created (TG_OP, OLD, NEW)) THEN
UPDATE
site_aggregates sa
SET
posts = posts + 1
FROM
site s
WHERE
sa.site_id = s.id;
END IF;
RETURN NULL;
END
$$;
CREATE OR REPLACE FUNCTION site_aggregates_post_insert ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
UPDATE
site_aggregates sa
SET
posts = posts + (
SELECT
count(*)
FROM
new_post)
FROM
site s
WHERE
sa.site_id = s.id;
RETURN NULL;
END
$$;
CREATE OR REPLACE TRIGGER site_aggregates_post_update
AFTER UPDATE OF removed,
deleted ON post
FOR EACH ROW
WHEN (NEW.local = TRUE)
EXECUTE PROCEDURE site_aggregates_post_update ();
CREATE OR REPLACE TRIGGER site_aggregates_post_insert
AFTER INSERT ON post REFERENCING NEW TABLE AS new_post
FOR EACH STATEMENT
EXECUTE PROCEDURE site_aggregates_post_insert ();
CREATE OR REPLACE TRIGGER person_aggregates_post_count
AFTER DELETE OR UPDATE OF removed,
deleted ON post
FOR EACH ROW
EXECUTE PROCEDURE person_aggregates_post_count ();
CREATE OR REPLACE TRIGGER person_aggregates_post_insert
AFTER INSERT ON post REFERENCING NEW TABLE AS new_post
FOR EACH STATEMENT
EXECUTE PROCEDURE person_aggregates_post_insert ();
-- Avoid running hash function and random number generation for default ap_id
CREATE SEQUENCE IF NOT EXISTS changeme_seq AS bigint CYCLE;
CREATE OR REPLACE FUNCTION generate_unique_changeme ()
RETURNS text
LANGUAGE sql
AS $$
SELECT
'http://changeme.invalid/seq/' || nextval('changeme_seq')::text;
$$;