Besides using the word "cache" what does this have to do with caching? It looks like it's just storing the session in postgres/redis. Caching implies there's

Besides using the word "cache" what does this have to do with caching? It looks like it's just storing the session in postgres/redis. Caching implies there's some slower/laggier/more remote primary storage, for which the cache provides faster/readier access to some data of the primary storage.