private String createCacheKey() {
    // TODO: store objects containing individual mappings instead of single object containing all
    // mappings
    return TEMP_PHOTOS_KEY;
  }
Key for cache of album mappings. TODO: Add a method parameter for a {@code key} for fine
grained objects.
extensions/data-transfer/portability-data-transfer-imgur/src/main/java/org/datatransferproject/datatransfer/imgur/photos/ImgurPhotosImporter.java