-- adds parent column

ALTER TABLE {{ index .Options "Namespace" }}.refresh_tokens
ADD COLUMN IF NOT EXISTS parent varchar(255) NULL;

DO $$
BEGIN
  IF NOT EXISTS(SELECT *
    FROM information_schema.constraint_column_usage
    WHERE table_schema = '{{ index .Options "Namespace" }}' and table_name='refresh_tokens' and constraint_name='refresh_tokens_token_unique')
  THEN
      ALTER TABLE "{{ index .Options "Namespace" }}"."refresh_tokens" ADD CONSTRAINT refresh_tokens_token_unique UNIQUE ("token");
  END IF;

  IF NOT EXISTS(SELECT *
    FROM information_schema.constraint_column_usage
    WHERE table_schema = '{{ index .Options "Namespace" }}' and table_name='refresh_tokens' and constraint_name='refresh_tokens_parent_fkey')
  THEN
      ALTER TABLE "{{ index .Options "Namespace" }}"."refresh_tokens" ADD CONSTRAINT refresh_tokens_parent_fkey FOREIGN KEY (parent) REFERENCES {{ index .Options "Namespace" }}.refresh_tokens("token");
  END IF;

  CREATE INDEX IF NOT EXISTS refresh_tokens_parent_idx ON "{{ index .Options "Namespace" }}"."refresh_tokens" USING btree (parent);
END $$;