Replaces all of the study's mutable fields — name, description, notes, and approve — with the body, so send the complete desired state on every call. name is required and must not be blank. Omitting approve keeps the study's current approval setting. The study stays in its current project; a projectID in the body is ignored — use POST /api/v1/studies/{studyID}/move to move it. Collaborators, managers, and meta fields are not managed by this endpoint and are left unchanged. A name change is recorded in the study's journal log. Use the PATCH call to change only part of the study.