fix: clean up someday lists and tasks when disconnecting a calendar provider

Unlink external references (externalId, externalProvider, externalListId)
from someday lists and tasks when their associated calendar connection
is deleted, so orphaned entries don't persist in the UI.

v1.57.8

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.57.7",
+  "version": "1.57.8",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {

src/app/api/calendar/connections/route.ts

@@ -190,6 +190,20 @@ export async function DELETE(request: NextRequest) {
             where: { id: connectionId, userId: user.id }
         });
 
+        if (connection) {
+            // Unlink someday lists that were synced with this provider
+            await prisma.somedayList.updateMany({
+                where: { userId: user.id, externalProvider: connection.provider },
+                data: { externalId: null, externalProvider: null, lastSyncedAt: null },
+            });
+
+            // Unlink tasks that were synced with this provider
+            await prisma.task.updateMany({
+                where: { userId: user.id, externalProvider: connection.provider },
+                data: { externalId: null, externalProvider: null, externalListId: null, lastSyncedAt: null },
+            });
+        }
+
         // Delete the connection
         await prisma.calendarConnection.delete({
             where: {