CREATE TABLE follows (
    iri VARCHAR,
    follower_id BIGINT REFERENCES accounts (id) ON DELETE CASCADE,
    followee_id BIGINT REFERENCES accounts (id) ON DELETE CASCADE,
    created_at TIMESTAMP NOT NULL DEFAULT now(),
    CONSTRAINT follows_pkey PRIMARY KEY (follower_id, followee_id)
);

CREATE UNIQUE INDEX index_follows_on_iri ON follows(iri);