In Sanity Studio, I have Posts and I have People. Each Post references one or more People. At the time of a Post, People have certain jobs and those are included in the Post...

In Sanity Studio, I have Posts and I have People. Each Post references one or more People. At the time of a Post, People have certain jobs and those are included in the Post as a People reference. If someone's job later changes, I don't want the content in each Post to update with it. I'd appreciate guidance about where I should I be looking to implement this sort of thing. Thanks!

Post refer to Jobs(At the time of a Post).Jobs refer to people.
People refer to Jobs(current).

You will have to make one customization which I don't think is available in sanity by default. So that, at the time of creating the post. The references to Jobs for a person are saved.

Perhaps each person can have a reference to an array of Objects representing jobs held. Then a job can have a

start

and

end

date that can be used to switch out based on some other logic. Like a post date.
Sounds like a content modeling wrangle-up!

You could also make
In the

Post

type, and then make a custom input component that fetched the person’s job title and set the string field to that value. Here's some code that can be adapted. https://github.com/sanity-io/sanity-recipes/blob/master/snippets/stringInputWithValuesFromAnotherDocument.js

Or do it with a custom document action! Like, when you push publish, go to the referenced Person document and set the job title to the post document. https://www.sanity.io/docs/document-actions

, , and : Thank you all very much for the advice!