code: public String getIdentifier() {
          if (identifier != null) {
              return identifier;
          }
  
          if (urls == null) {
              return null;
          }
  
          if (database != null) {
              return String.join(",", urls) + " (DB: " + database + ")";
          }
  
          return String.join(",", urls);
      }
docs: Gets the identifier for this store.