lemmy/migrations/2023-07-26-222023_site-aggregates-one/up.sql

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CREATE OR REPLACE FUNCTION site_aggregates_site ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
-- we only ever want to have a single value in site_aggregate because the site_aggregate triggers update all rows in that table.
-- a cleaner check would be to insert it for the local_site but that would break assumptions at least in the tests
IF (TG_OP = 'INSERT') AND NOT EXISTS (
SELECT
id
FROM
site_aggregates
LIMIT 1) THEN
INSERT INTO site_aggregates (site_id)
VALUES (NEW.id);
ELSIF (TG_OP = 'DELETE') THEN
DELETE FROM site_aggregates
WHERE site_id = OLD.id;
END IF;
RETURN NULL;
END
$$;
DELETE FROM site_aggregates a
WHERE NOT EXISTS (
SELECT
id
FROM
local_site s
WHERE
s.site_id = a.site_id);