public void create(@NotNull BlobEntity bean) throws StorageException {
        Preconditions.requireNonBlank(bean.getId(), "Caller must set ID for blob before storing to ensure they are able to look it up");
        super.create(bean);
    }
Create a blob. Caller <em>must</em> set ID themselves.
UUID recommended as a component of ID to avoid collisions.
manager/api/jpa/src/main/java/io/apiman/manager/api/jpa/blobstore/BlobStoreRepository.java