code: def _all_tables_present(self, txn):
          
          conn = txn.connect()
          for table_name in asset_db_table_names:
              if txn.dialect.has_table(conn, table_name):
                  return True
          return False
docs: Checks if any tables are present in the current assets database.
  
          Parameters
          ----------
          txn : Transaction
              The open transaction to check in.
  
          Returns
          -------
          has_tables : bool
              True if any tables are present, otherwise False.