lemmy/migrations/2021-04-02-021422_remove_co.../down.sql

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-- Add the column back
ALTER TABLE community
ADD COLUMN creator_id int REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE;
-- Recreate the index
CREATE INDEX idx_community_creator ON community (creator_id);
-- Add the data, selecting the highest mod
UPDATE
community
SET
creator_id = sub.person_id
FROM (
SELECT
cm.community_id,
cm.person_id
FROM
community_moderator cm
LIMIT 1) AS sub
WHERE
id = sub.community_id;
-- Set to not null
ALTER TABLE community
ALTER COLUMN creator_id SET NOT NULL;