The datomic_kvs table is not your typical SQL table - it's unlikely you will be able to glean any useful information from it. It's not really intended to be interacted with by an end-user the way a normal SQL structured table is, there is a whole different query language and technology involved.
You can read more about it here: Datomic - Home
Unfortunately, though, this probably won't help you much either - at this point, the Datomic data in UIM is pretty much a "black box" and there is no real visibility into the raw data for interfaces.