public Iterator<BlobEntity> getAll() throws StorageException {
        Query allBlobsQuery = getActiveEntityManager().createQuery("SELECT b FROM BlobEntity b");
        return super.getAll(BlobEntity.class, allBlobsQuery);
    }
Delete by provided ID (nb: not name, its ID set when stored).

<p>Does not truly delete the file if there are other (i.e. deduplicated) references to this blob. In this case
the reference counter is decremented.
manager/api/jpa/src/main/java/io/apiman/manager/api/jpa/blobstore/BlobStoreRepository.java