text: -- +migrate Up
  UPDATE hydra_client SET sector_identifier_uri='', jwks='', jwks_uri='', request_uris='';
  ALTER TABLE hydra_client MODIFY sector_identifier_uri TEXT NOT NULL;
  ALTER TABLE hydra_client MODIFY jwks TEXT NOT NULL;
  ALTER TABLE hydra_client MODIFY jwks_uri TEXT NOT NULL;
  ALTER TABLE hydra_client MODIFY request_uris TEXT NOT NULL;
  
  -- +migrate Down
  ALTER TABLE hydra_client MODIFY sector_identifier_uri TEXT;
  ALTER TABLE hydra_client MODIFY jwks TEXT;
  ALTER TABLE hydra_client MODIFY jwks_uri TEXT;
  ALTER TABLE hydra_client MODIFY request_uris TEXT;