> then wrap it any of the available Raft libraries.
Raft does consensus. Raft does not do persistence to disk, WAL, crash recovery, indexing, vacuuming (you're using tombstones for your deletes, right?), or any of the other necessary pieces of a database. That's not mentioning how such a system has no query engine, so every piece of data you're looking up in every place you need data is traversing your bespoke data structures.
What you described isn't a database. Keeping some disposable values cached isn't a database.
Raft does consensus. Raft does not do persistence to disk, WAL, crash recovery, indexing, vacuuming (you're using tombstones for your deletes, right?), or any of the other necessary pieces of a database. That's not mentioning how such a system has no query engine, so every piece of data you're looking up in every place you need data is traversing your bespoke data structures.
What you described isn't a database. Keeping some disposable values cached isn't a database.