code: def _register_default_option(nsobj, opt):
      
      item = ConfigItem.get(nsobj.namespace_prefix, opt.name)
      if not item:
          logger.info('Adding {} ({}) = {} to {}'.format(
              opt.name,
              opt.type,
              opt.default_value,
              nsobj.namespace_prefix
          ))
          item = ConfigItem()
          item.namespace_prefix = nsobj.namespace_prefix
          item.key = opt.name
          item.value = opt.default_value
          item.type = opt.type
          item.description = opt.description
          nsobj.config_items.append(item)
      else:
          if item.description != opt.description:
              logger.info('Updating description of {} / {}'.format(item.namespace_prefix, item.key))
              item.description = opt.description
              db.session.add(item)
docs: Register default ConfigOption value if it doesn't exist. If does exist, update the description if needed