Faster way to get checksums?

[pseudocoder]

I have a script which checks whether documents have been deleted from source folders.

It does this by getting MD5 checksums of the source documents, and then seeing if the checksum of each Paperless document (using the metadata API) exists in the list. Any document which no longer exists gets tagged as "deleted" and I can then manually process it.

The problem is that calling the metadata API for every document takes a long time - is there a way to get checksums for more than one document at the same time? Or a way of reducing the output from the metadata API, which would probably make it quicker?

[pseudocoder]

An alternative would be to be if I could get the document ID from the checksum in the API (since I can more quickly get the checksums from the file storage).

But this also doesn't seem to be an option, e.g. something like this:

http://(myurl)/api/documents/?checksum=3df9cdef594a812d64edfbccc9b46072