user.lastChangedDate for efficient retrieval of user updates

I noticed that, in responses, for user and identity.user objects only the user.identifier is provided, but not the displayName. I understand/guess this is probably for efficiency / performance reasons.

From the client perspective, however, this raises the question on how often to query the /users endpoint to retrieve information on users and keep it up-to-date.

My idea here is that I could probably use OData to query only for users whose records were created or updated since the last time the client checked. I'd need a lastChangedDate property for that, though.

All I could find was lastPasswordChangeDateTime, which tracks only password changes.

No file, test, or entry point is named. Start by locating the schemas and handlers for user and identity.user, then inspect how OData filtering is exposed for user records. Done means a lastChangedDate property is available and can support retrieving users created or updated since a supplied time.