code: def RollbackAll(close=None):
      
      if close:
          warnings.simplefilter('default')
          warnings.warn("close parameter will not need at all.", DeprecationWarning)
  
      for k, v in engine_manager.items():
          session = v.session(create=False)
          if session:
              session.rollback()
docs: Rollback all transactions, according Local.conn