text: from .helper import ConcurrentUpdateError
  
  
  class RssantModelError(Exception):
      """Base exception for rssant API models"""
  
  
  class FeedExistError(RssantModelError):
      """Feed already exists"""
  
  
  class FeedNotFoundError(RssantModelError):
      """Feed not found"""
  
  
  class StoryNotFoundError(RssantModelError):
      """Story not found"""
  
  
  class FeedStoryOffsetError(RssantModelError):
      """Feed story_offset error"""
  
  
  __all__ = (
      'ConcurrentUpdateError',
      'RssantModelError',
      'FeedExistError',
      'FeedNotFoundError',
      'StoryNotFoundError',
      'FeedStoryOffsetError',
  )
  