docs: def exists(c_table_cd: str, tables: I2B2Tables) -> int:
          """ Return the number of records that exist with the table code.
          - Ideally this should be zero or one, but the default table doesn't have a key
  
          :param c_table_cd: key to test
          :param tables:
          :return: number of records found
          """
          conn = tables.ont_connection
          table = tables.schemes
          return bool(list(conn.execute(table.select().where(table.c.c_table_cd == c_table_cd))))