Limit RFV history query to period buyers

src/pages/Clients.tsx

@@ -83,12 +83,14 @@ const Clients = () => {
     let isMounted = true;
 
     const loadClients = async () => {
-      const [clientsData, rfmData] = await Promise.all([
-        fetchClientAnalytics(dateRange),
-        fetchRfmAnalytics(dateRange)
-      ]);
+      const clientsData = await fetchClientAnalytics(dateRange);
       if (isMounted) {
         setClientAnalytics(clientsData);
+        setRfmAnalytics(null);
+      }
+
+      const rfmData = await fetchRfmAnalytics(dateRange);
+      if (isMounted) {
         setRfmAnalytics(rfmData);
       }
     };