Cable terminations are not refreshed correctly on API PATCH of Cable

[bctiemann]

Deployment Type

Self-hosted

Triage priority

I volunteer to perform this work (if approved)

NetBox Version

v4.1.8

Python Version

3.10

Steps to Reproduce

Ideally populate the DB with a large number (1000+) of Interfaces and Cables connecting them.

API call:

http://127.0.0.1:8000/api/dcim/cables/1/
{
    "b_terminations": [
        {
            "object_type": "dcim.interface",
            "object_id": 161
        }
    ]
}

Compare to UI edit of Cable where B-side interface is changed.

Expected Behavior

Both operations (UI and API) should have the same effect and execute in the same amount of time.

Observed Behavior

The UI call completes in a few hundred ms; but depending on the data size, the API call can take many seconds or minutes to complete.