docs: @Override
      public JdbcQueue<ID, DATA> init() throws Exception {
          SQL_COUNT = MessageFormat.format(SQL_COUNT, getTableName());
          SQL_COUNT_EPHEMERAL = MessageFormat.format(SQL_COUNT_EPHEMERAL, getTableNameEphemeral());
  
          if (jdbcHelper == null) {
              setJdbcHelper(buildJdbcHelper(), true);
          }
  
          super.init();
  
          if (jdbcHelper == null) {
              throw new IllegalStateException("JDBC helper is null.");
          }
  
          return this;
      }