docs: public String getValidationQuery() {
          final String validationQuery = basicJdbcConfiguration.getConfiguredValidationQuery();
          if (calculatedValidationQuery == null || StringUtils.hasText(validationQuery)) {
              calculatedValidationQuery = validationQuery;
              if (!StringUtils.hasText(calculatedValidationQuery)) {
                  JdbcDatabaseManager.findDatabase(getUrl()).ifPresent(db ->
                      calculatedValidationQuery = db.getValidationQuery());
              }
          }
  
          return calculatedValidationQuery;
      }