diff --git a/layer/utils/firestore.go b/layer/utils/firestore.go
index 00d31f5..3a2e60a 100644
--- a/layer/utils/firestore.go
+++ b/layer/utils/firestore.go
@@ -60,7 +60,7 @@ func getLastDiff(client *firestore.Client, ctx context.Context, userId string, a
 
 func generateAndStoreDiff(client *firestore.Client, ctx context.Context, res Res, userId string, sessionId string) error {
 	newDiff := resToDiff(res, userId)
-	_, err := client.Collection("users").Doc(userId).Collection("diffs").Doc("diff_"+userId).Set(ctx, newDiff)
+	_, _, err := client.Collection("profileDiffs").Add(ctx, diffToMap(newDiff))
 	if err != nil {
 		return err
 	}
diff --git a/layer/utils/logging.go b/layer/utils/logging.go
index 2251d74..3790519 100644
--- a/layer/utils/logging.go
+++ b/layer/utils/logging.go
@@ -18,6 +18,7 @@ func logProfileStored(client *firestore.Client, ctx context.Context, diff Diff,
 			"sessionId": sessionId,
 		},
 		Body: map[string]interface{}{
+			"userId":  userId,
 			"profile": diffToMap(diff),
 		},
 	}
@@ -51,6 +52,7 @@ func LogHealth(client *firestore.Client, ctx context.Context, userId string, isS
 			"sessionId": sessionId,
 		},
 		Body: map[string]interface{}{
+			"userId":    	  userId,
 			"serviceRunning": isServiceRunning,
 		},
 	}