Hello John, you can rewrite history by enabling
history rewriting, but there is no way to modify the `_lastUpdated` field via a client, even when rewriting history. That is server-controlled, and represents the time the operation that modified the resource occurred. The
spec indicates that
"The server / resource manager sets this value; what a client provides is irrelevant." You are free to implement a Provider and repository which contravenes the spec, but HAPI-FHIR provides no such mechanism.
Cheers,
--Gary