lemmy/migrations/2022-11-21-204256_user-following/up.sql

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-- create user follower table with two references to persons
CREATE TABLE person_follower (
id serial PRIMARY KEY,
person_id int REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
follower_id int REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
published timestamp NOT NULL DEFAULT now(),
pending boolean NOT NULL,
UNIQUE (follower_id, person_id)
);
UPDATE
community_follower
SET
pending = FALSE
WHERE
pending IS NULL;
ALTER TABLE community_follower
ALTER COLUMN pending SET NOT NULL;