CREATE TABLE instance (
    id serial PRIMARY KEY,
    domain varchar(255) NOT NULL UNIQUE,
    published timestamp NOT NULL DEFAULT now(),
    updated timestamp NULL
);
…
INSERT INTO instance (DOMAIN)
SELECT DISTINCT
    substring(p.actor_id FROM '(?:.*://)?(?:www\.)?([^/?]*)')
FROM (
    SELECT
        actor_id
    FROM
        site
    UNION
    SELECT
        actor_id
    FROM
        person
    UNION
    SELECT
        actor_id
    FROM
        community) AS p;
…
ALTER TABLE person
    ADD COLUMN instance_id int REFERENCES instance ON UPDATE CASCADE ON DELETE CASCADE;
…
UPDATE
    person
SET
    instance_id = i.id
FROM
    instance i
WHERE
    substring(actor_id FROM '(?:.*://)?(?:www\.)?([^/?]*)') = i.domain;
…
ALTER TABLE person
    ALTER COLUMN instance_id SET NOT NULL;
…
CREATE TABLE federation_blocklist (
    id serial PRIMARY KEY,
    instance_id int REFERENCES instance ON UPDATE CASCADE ON DELETE CASCADE NOT NULL UNIQUE,
    published timestamp NOT NULL DEFAULT now(),
    updated timestamp NULL
);

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