Which OpenAI api objects are cleaned up by the server vs. which are the app’s responsibility? I’m most interested in:

Assistants, VectorStores, VectorStoreFiles — all seem intuitively like things that will be retained until the app removes them explicitly.

Threads — seem like they would be retained also, but there’s no delete endpoint. Do these just pile up over time?

Messages — maybe these are these subordinate to threads and have the same (unknown) lifecycle?

by contrast, Runs and RunSteps — seem intuitively transitory, that I shouldn’t depend on being list-able or retrieve-able later, nor should I expect to need to delete explicitly.

I’ve searched docs thoroughly. Can someone give me better guidance than just these guesses?