diff --git a/backend/src/modules/note-prompts/scheduler.ts b/backend/src/modules/note-prompts/scheduler.ts
index 098220c..157e323 100644
--- a/backend/src/modules/note-prompts/scheduler.ts
+++ b/backend/src/modules/note-prompts/scheduler.ts
@@ -93,11 +93,11 @@ const TriggerWebhookSchema = z.object({
 // ── Repository helpers ─────────────────────────────────────────────
 
 function scheduleCollection() {
-  return getCollection<PromptScheduleDoc>('note_prompt_schedules');
+  return getCollection<PromptScheduleDoc>('note_prompt_schedules', '/userId');
 }
 
 function webhookCollection() {
-  return getCollection<PromptWebhookDoc>('note_prompt_webhooks');
+  return getCollection<PromptWebhookDoc>('note_prompt_webhooks', '/userId');
 }
 
 // ── Cron utilities ─────────────────────────────────────────────────