Best practice for update 30.000 products stock on an hourly base.

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Hi all,
Today we are using the rest admin APIs to update stock for every single product. As you can imagine it takes 24 hours or more.
I saw that graphQL could do much better but only if you calculate the delta (we won't do that).
So my question is: is there a way to massively update my 30.000 catalog stocks once per hour and without calculating delta?