code: public static String dbUrl() {
          String dbUrl = getPropertyValue(Key.DB_URL);
          if (dbUrl == null) {
              if (VictimsDB.Driver.exists(dbDriver())) {
                  return VictimsDB.defaultURL(dbDriver());
              }
              return VictimsDB.defaultURL();
          }
          return dbUrl;
      }
docs: Get the db connection URL.
  
  @return