General: Cache

[Oculux314]

Description:

We currently have data stored locally, in the store, in the cache, and on the server only.

Local storage is just in local variables in the code. The cache is global, but wiped on reload. The cache is persistent across reloads, and the server is our source of truth but expensive (and slow) to query.* Some queries are accidentally being stored in the wrong place. We should optimise this.

Acceptance Criteria:**

• As many queries are stored locally or in the cache as possible.
• All queries that need to be wiped on reload but still global stored in the local store.
• Only new queries or ones that need to be up-to-date are made to the server.
• All functionality still works.
• Screens are automatically refreshed with the most up-to-date data upon load.

Definition of Done:

• AC met
• PR linked
• Branch merged

Notes

* As far as I know. Aaron proposed this ticket - I recommend consulting with him about this ticket.
** These AC are stretch goals.

Wide-spanning ticket - communicate with #419 #447 #448 to avoid merge conflicts.