ALTER TABLE par_api_webrota
  ADD COLUMN access_token_exp BIGINT;
ALTER TABLE par_api_webrota
  ADD COLUMN refresh_token_exp BIGINT;

UPDATE par_api_webrota SET access_token_exp = 0 WHERE access_token_exp IS NULL;
UPDATE par_api_webrota SET refresh_token_exp = 0 WHERE refresh_token_exp IS NULL;

ALTER TABLE par_api_webrota
  ALTER COLUMN access_token_exp SET NOT NULL;
ALTER TABLE par_api_webrota
  ALTER COLUMN refresh_token_exp SET NOT NULL;