ALTER TABLE site_brand_settings
  DROP CONSTRAINT IF EXISTS site_brand_settings_banner_image_data_url_check,
  DROP CONSTRAINT IF EXISTS site_brand_settings_login_background_data_url_check;

ALTER TABLE site_brand_settings
  ADD CONSTRAINT site_brand_settings_banner_image_data_url_check
    CHECK (char_length(banner_image_data_url) <= 28000000),
  ADD CONSTRAINT site_brand_settings_login_background_data_url_check
    CHECK (char_length(login_background_data_url) <= 28000000);