From dab3606b04698e63fcf0e3c88862e5b7441d54da Mon Sep 17 00:00:00 2001
From: Linus Rath <139418639+rathlinus@users.noreply.github.com>
Date: Tue, 31 Mar 2026 16:15:56 +0200
Subject: [PATCH] fix: strip server-immutable fields from updates before
 sending to JMAP #128

---
 lib/jmap/client.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/jmap/client.ts b/lib/jmap/client.ts
index 9c3b9b29..c1a0a0d5 100644
--- a/lib/jmap/client.ts
+++ b/lib/jmap/client.ts
@@ -3513,8 +3513,8 @@ export class JMAPClient implements IJMAPClient {
   ): Promise<void> {
     const accountId = targetAccountId || this.getCalendarsAccountId();
 
-    // Strip client-only shared fields before sending to JMAP
-    const { originalId: _oi, originalCalendarIds: _oc, accountId: _ai, accountName: _an, isShared: _is, ...cleanUpdates } = updates as CalendarEvent;
+    // Strip client-only and server-immutable fields before sending to JMAP
+    const { id: _id, uid: _uid, '@type': _typ, created: _cr, updated: _up, sequence: _sq, isOrigin: _io, isDraft: _idr, originalId: _oi, originalCalendarIds: _oc, accountId: _ai, accountName: _an, isShared: _is, ...cleanUpdates } = updates as CalendarEvent;
     cleanRecurrenceRules(cleanUpdates as unknown as Record<string, unknown>);
 
     const setArgs: Record<string, unknown> = {