code: def WriteSignedBinaryBlobs(binary_urn,
                             blobs,
                             token = None):
    
    if _ShouldUseLegacyDatastore():
      aff4.FACTORY.Delete(binary_urn, token=token)
      with data_store.DB.GetMutationPool() as mutation_pool:
        with aff4.FACTORY.Create(
            binary_urn,
            collects.GRRSignedBlob,
            mode="w",
            mutation_pool=mutation_pool,
            token=token) as fd:
          for blob in blobs:
            fd.Add(blob, mutation_pool=mutation_pool)
  
    if data_store.RelationalDBEnabled():
      blob_references = rdf_objects.BlobReferences()
      current_offset = 0
      for blob in blobs:
        blob_id = data_store.BLOBS.WriteBlobWithUnknownHash(
            blob.SerializeToString())
        blob_references.items.Append(
            rdf_objects.BlobReference(
                offset=current_offset, size=len(blob.data), blob_id=blob_id))
        current_offset += len(blob.data)
      data_store.REL_DB.WriteSignedBinaryReferences(
          _SignedBinaryIDFromURN(binary_urn), blob_references)
docs: Saves signed blobs to the datastore.
  
    If a signed binary with the given URN already exists, its contents will get
    overwritten.
  
    Args:
      binary_urn: RDFURN that should serve as a unique identifier for the binary.
      blobs: An Iterable of signed blobs to write to the datastore.
      token: ACL token to use with the legacy (non-relational) datastore.