code: @Override
      public JsonObject upgrade(final JsonObject outdatedDBEntry, Map<File, JsonObject> dbSnapshot) {
          return rename(outdatedDBEntry, newName, path);
      }
docs: Generic renaming.
  
  @param outdatedDBEntry the outdated db entry where the upgrade should be applied to.
  @param dbSnapshot      all entries of the current database which may are partially upgraded.
  
  @return the updated value.