From b5c15964e7828af0d45e2c58d6ee9f76a341bd97 Mon Sep 17 00:00:00 2001
From: alma <alma@governance-labs.org>
Date: Thu, 15 Jan 2026 16:49:29 +0100
Subject: [PATCH] Agenda refactor

---
 lib/services/microsoft-calendar-sync.ts | 29 +++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/lib/services/microsoft-calendar-sync.ts b/lib/services/microsoft-calendar-sync.ts
index a49f543..e4e4ee4 100644
--- a/lib/services/microsoft-calendar-sync.ts
+++ b/lib/services/microsoft-calendar-sync.ts
@@ -1082,6 +1082,35 @@ export async function syncMicrosoftCalendar(
       }
     }
 
+    // Delete events that are no longer in Microsoft calendar
+    // Build a set of all Microsoft event IDs we just synced
+    const syncedMicrosoftIds = new Set<string>();
+    for (const caldavEvent of caldavEvents) {
+      if (caldavEvent.uid) {
+        syncedMicrosoftIds.add(caldavEvent.uid);
+      }
+    }
+
+    // Find events in DB that have externalEventId but are not in the synced list
+    // Only delete events that have an externalEventId (to avoid deleting manually created events)
+    for (const existingEvent of existingEvents) {
+      const externalId = (existingEvent as any).externalEventId;
+      if (externalId && !syncedMicrosoftIds.has(externalId)) {
+        // This event exists in DB but not in Microsoft - it was deleted in Microsoft
+        logger.info('Deleting event that no longer exists in Microsoft', {
+          eventId: existingEvent.id,
+          title: existingEvent.title,
+          externalEventId: externalId,
+        });
+        
+        await prisma.event.delete({
+          where: { id: existingEvent.id },
+        });
+        
+        deleted++;
+      }
+    }
+
     // Update sync timestamp
     await prisma.calendarSync.update({
       where: { id: calendarSyncId },