CREATE TABLE IF NOT EXISTS member_referrers (
  id                UUID DEFAULT uuid_generate_v4(),
  member_id         UUID NOT NULL,
  can_use           BOOLEAN NOT NULL DEFAULT TRUE,
  memo              TEXT,
  created_at        BIGINT NOT NULL DEFAULT (extract(epoch from now()) * 1000),
  updated_at        BIGINT NOT NULL DEFAULT (extract(epoch from now()) * 1000),
  PRIMARY KEY (id),
  CONSTRAINT fk_member_referrers_member_id
    FOREIGN KEY(member_id) 
	    REFERENCES members(id)
);

CREATE INDEX idx_member_referrers_member_id ON member_referrers (member_id);

-- trigger (updated_at)
CREATE TRIGGER tg_member_referrers_updated_at
  BEFORE UPDATE
  ON member_referrers
  FOR EACH ROW
  EXECUTE PROCEDURE update_updated_at_column();