So, a database that's has a file format of write-once content-addressed "shards" and is persisted/distributed by "offlining" those shards into object storage, and then "onlining" them back into a given DB node's MRU cache at query time; and is mostly read-only, but can update by downloading the relevant shards, modifying them locally, re-hashing the modified shards to get new names for them, and then uploading them again under those new names.

Is this basically equivalent to Datomic, then? (Not that that's a bad thing. The world needs an open-source, non-JVM-targeted Datomic.)