Refactor get individual patient (focus on referral metrics)

Currently, the get individual patient endpoint can take a long time (46s, 52s, 104s) if the individual has a lot of referrers.

This endpoint leads to spikes in database usage (~40% spikes)

Proposed Solution
Explore ways to refactor this endpoint or create cron jobs to get the same data.

https://capture.dropbox.com/Xusu1fEGhrcl6aC6-➝ database usage spikes here

https://capture.dropbox.com/V2hSDxIYXPvWLyV5

https://capture.dropbox.com/OMWxUcDPnAXW3ldP