`ApiClient.last_access` not updating correctly in some cases

[robhudson]

The last_access timestamp in the ApiClient model is not updating correctly in some cases. I observed this when:

1. Creating a new API client.
2. Using Swagger UI to make queries.
3. Checking the last_access field and noticing that it was not updated as expected.

This needs further investigation to determine:

• Where last_access is currently updated.
• If there are gaps in coverage where API interactions should trigger an update but don't.
• How we can ensure last_access remains a reliable indicator of an ApiClient record's activity.