Dont assume id on storage objects

src/storage/storage-memory-synced.ts

@@ -20,14 +20,11 @@ export class StorageMemorySynced<T extends Record<string, any> = Record<string,
     });
 
     this.store.on('update', async (payload) => {
-      // For update events, we need to find and update the document in memory
-      // Since we don't have the filter, we'll update by key
-      const filter = {
-        id: payload.value.id,
-      } as unknown as Partial<T>
-
-      // Update the document in memory by ID.
-      await this.inMemoryCache.updateOne(filter, payload.value);
+      // Remove the old version and insert the new one. We use delete + insert
+      // rather than updateOne because the oldValue is the complete document,
+      // guaranteeing an exact match without assuming any particular key field.
+      await this.inMemoryCache.deleteOne(payload.oldValue);
+      await this.inMemoryCache.insertOne(payload.value);
       this.emit('update', payload);
     });