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• subjectId (optional): id of the subject in the external system
• subjectNamespace (optional): namespace of the subject id in the external system

TB: this isn't possible (well not by an external REST access - it would be an internal admin operation); all you can do is mark an EHR as inactive, which would be a POST (I think) to /ehr/{ehr_id}/ehr_status/other_details/is_active or similar. But even this operation, if it succeeds, is serious - it makes it look like an EHR is deleted, so it's probably not appropriate via any externally visible REST interface.

SI: In some countries the patient/client is owner of the data and it has the right (by the law) to ask for a complete (total) removal of all his data, which is more than just an inactive flag.

TB: that's true, but doing the delete would require some documentation and/or special permission. I still doubt very much that this could ever be done through a visible REST interface, unless all the proof parameters were provided, and I think these would be too variable to standardise.