code: func (g *Graveyard) DumpTxn(tx *memdb.Txn) (memdb.ResultIterator, error) {
  	iter, err := tx.Get("tombstones", "id")
  	if err != nil {
  		return nil, err
  	}
  
  	return iter, nil
  }
docs: // DumpTxn returns all the tombstones.