diff --git a/artifacts/cra-app/src/pages/timesheet-detail.tsx b/artifacts/cra-app/src/pages/timesheet-detail.tsx
index 192f2ae..956b0cc 100644
--- a/artifacts/cra-app/src/pages/timesheet-detail.tsx
+++ b/artifacts/cra-app/src/pages/timesheet-detail.tsx
@@ -58,10 +58,10 @@ export default function TimesheetDetailPage() {
   const deleteLine = useDeleteTimesheetLine();
   const upsertEntries = useUpsertTimeEntries();
 
-  // Local state for optimistic updates
   const [localEntries, setLocalEntries] = useState<Record<string, number>>({});
   const [isAddingLine, setIsAddingLine] = useState(false);
   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false);
+  const dirtyKeysRef = useRef<Set<string>>(new Set());
   
   const { data: projects } = useListProjects({ query: { queryKey: getListProjectsQueryKey() } });
 
@@ -78,6 +78,7 @@ export default function TimesheetDetailPage() {
       });
       setLocalEntries(initial);
       setHasUnsavedChanges(false);
+      dirtyKeysRef.current.clear();
     }
   }, [timesheet]);
 
@@ -114,10 +115,11 @@ export default function TimesheetDetailPage() {
     const entries = localEntriesRef.current;
 
     const entriesToSave: LocalEntry[] = [];
+    const dirty = dirtyKeysRef.current;
     Object.entries(entries).forEach(([key, hours]) => {
       const lineIdStr = key.split("-")[0];
       const fullDate = key.substring(lineIdStr.length + 1);
-      if (hours > 0) {
+      if (hours > 0 || dirty.has(key)) {
         entriesToSave.push({
           timesheetLineId: parseInt(lineIdStr),
           date: fullDate,
@@ -134,6 +136,7 @@ export default function TimesheetDetailPage() {
       onSuccess: () => {
         setSaveStatus("saved");
         setHasUnsavedChanges(false);
+        dirtyKeysRef.current.clear();
         queryClient.invalidateQueries({ queryKey: getGetTimesheetQueryKey(timesheetId) });
         setTimeout(() => setSaveStatus("idle"), 2000);
       },
@@ -148,6 +151,7 @@ export default function TimesheetDetailPage() {
     const key = `${lineId}-${dateStr}`;
     setLocalEntries(prev => ({ ...prev, [key]: hours }));
     setHasUnsavedChanges(true);
+    dirtyKeysRef.current.add(key);
 
     if (saveTimerRef.current) clearTimeout(saveTimerRef.current);
     saveTimerRef.current = setTimeout(() => doSave(), 800);
@@ -181,11 +185,12 @@ export default function TimesheetDetailPage() {
 
     if (hasUnsavedChanges) {
       const entries = localEntriesRef.current;
+      const dirty = dirtyKeysRef.current;
       const entriesToSave: LocalEntry[] = [];
       Object.entries(entries).forEach(([key, hours]) => {
         const lineIdStr = key.split("-")[0];
         const fullDate = key.substring(lineIdStr.length + 1);
-        if (hours > 0) {
+        if (hours > 0 || dirty.has(key)) {
           entriesToSave.push({ timesheetLineId: parseInt(lineIdStr), date: fullDate, hours });
         }
       });
diff --git a/attached_assets/image_1776156391873.png b/attached_assets/image_1776156391873.png
new file mode 100644
index 0000000..7d5b294
Binary files /dev/null and b/attached_assets/image_1776156391873.png differ