lemmy/migrations/2022-01-20-160328_remove_si.../down.sql

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-- Add the column back
ALTER TABLE site
ADD COLUMN creator_id int REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE;
-- Add the data, selecting the highest admin
UPDATE
site
SET
creator_id = sub.id
FROM (
SELECT
id
FROM
person
WHERE
admin = TRUE
LIMIT 1) AS sub;
-- Set to not null
ALTER TABLE site
ALTER COLUMN creator_id SET NOT NULL;