Agenda refactor

app/agenda/page.tsx

@@ -320,7 +320,24 @@ export default async function CalendarPage() {
   }
 
   // Clean up duplicate calendars for the same mailCredentialId
-  // Keep only the most recent one with syncEnabled=true, delete others
+  // NOTE: This is mainly for cleaning up OLD duplicates created before we fixed the cascade deletion
+  // New duplicates should not occur since we now delete calendars when mail accounts are deleted
+  // This cleanup is conservative: only processes if there are multiple ENABLED syncs for the same account
+  
+  // Only run cleanup if there are actually multiple syncs to check (performance optimization)
+  const syncCountCheck = await prisma.calendarSync.count({
+    where: {
+      calendar: {
+        userId: session?.user?.id || ''
+      },
+      mailCredentialId: {
+        in: Array.from(allMailCredentialIds)
+      }
+    }
+  });
+
+  // Only run full cleanup if there are multiple syncs (likely duplicates)
+  if (syncCountCheck > allMailCredentialIds.size) {
     const allSyncs = await prisma.calendarSync.findMany({
       where: {
         calendar: {
@@ -423,6 +440,7 @@ export default async function CalendarPage() {
         }
       }
     }
+  }
 
   // Auto-sync Microsoft calendars if needed (background, don't block page load)
   const microsoftSyncConfigs = await prisma.calendarSync.findMany({