Architecturally yes but with an extension of in-memory columnar format as well. This makes it an HTAP (Hybid Transactional and Analytical Processing) database.
Wow, this is a very nice tool! Although I'm a ReMarkable2 user, I'm also curious about if this tool can be extended to support the newly launched Kindle Scribe.
In general, NewSQL (distributed database) may still be a good solution to address scalability limit encountered by a single server/node database like MySQL/PG. Currently, there are quite a few options in this domain: Spanner, PG-compatible (CockroachDB, YugaByte), MySQL-compatible (TiDB, MariaDB xPand), and other middleware products to handle sharding.
Of course it's not that old, but considering 1992 is the year I started to play with computers as a kid, that's older than I expected, at least for me.
I've used internet for the first time when the The Register became an online publication.