PATCH body for EmailTemplateAdminService.update. A content-only save
carries NO liveVersion — it does not move the live pointer, and the audit
row already names the version row it created — while any update that carries
status must name its target version. The union makes a fabricated
liveVersion on a content save unrepresentable rather than merely unread.
PATCH body for EmailTemplateAdminService.update. A content-only save carries NO
liveVersion— it does not move the live pointer, and the audit row already names the version row it created — while any update that carriesstatusmust name its target version. The union makes a fabricatedliveVersionon a content save unrepresentable rather than merely unread.