diff --git a/firestore.rules b/firestore.rules
index 885948c4..9193d637 100644
--- a/firestore.rules
+++ b/firestore.rules
@@ -279,15 +279,16 @@ service cloud.firestore {
       }
 
       // Date plan preferences: per-partner preferences for building date plans.
-      // Both members can read; each member can write their own preference.
-      match /date_plan_preferences/{userId} {
+      // Both members can read; either member can write a preference document.
+      // Document IDs are Firestore auto-IDs (not user IDs).
+      match /date_plan_preferences/{prefId} {
         allow read: if isCouplesMember(coupleId);
         allow create, update: if isCouplesMember(coupleId)
-          && request.resource.data.keys().hasOnly(['actions'])
-          && request.resource.data.actions.keys().hasOnly([request.auth.uid])
-          && request.resource.data.actions[request.auth.uid].keys().hasOnly(['action', 'swipedAt'])
-          && request.resource.data.actions[request.auth.uid].action != null
-          && request.resource.data.actions[request.auth.uid].swipedAt is timestamp;
+          && request.resource.data.keys().hasAll(['dateIdeaId', 'createdAt', 'updatedAt'])
+          && request.resource.data.keys().hasOnly([
+               'dateIdeaId', 'preferredDate', 'preferredTime',
+               'budget', 'duration', 'createdAt', 'updatedAt'
+             ]);
         allow delete: if false;
       }