Do you want a database big enough to store the Universe and itself?
You need a spatiotemporal database. #nowyouknow
Maybe after the fact. But a spatiotemporal database that’s being used/created WITHIN the spacetime of the Universe won’t be able to tag a spacetime that hasn’t happened yet, even if it somehow had the ability to catalog far off events.
There’s also https://en.wikipedia.org/wiki/Relativity_of_simultaneity which puts a monkey wrench in the whole idea of even being possible.