diff --git a/docs/UI_UX_DECISION_LEDGER.md b/docs/UI_UX_DECISION_LEDGER.md
index b663777..ebce309 100644
--- a/docs/UI_UX_DECISION_LEDGER.md
+++ b/docs/UI_UX_DECISION_LEDGER.md
@@ -239,6 +239,9 @@ instead of reproducing their behavior.
   and the backend applies every emitted filter/sort before pagination while
   returning `totalRows` for the filtered result. Server list filters declare
   their complete option domain instead of deriving it from the loaded page.
+  External filter affordances such as summary-count shortcuts update the
+  grid's `query` contract; the grid header controls and backend query therefore
+  always display and execute the same filter state.
 - Feedback and confirmation use `Dialog`, `ConfirmDialog`, or
   `DismissibleAlert`. They never fall back to `window.alert`.
 
diff --git a/webui/src/components/table/DataGrid.tsx b/webui/src/components/table/DataGrid.tsx
index 586faf0..c28c0c4 100644
--- a/webui/src/components/table/DataGrid.tsx
+++ b/webui/src/components/table/DataGrid.tsx
@@ -116,6 +116,12 @@ type DataGridBaseProps<T> = {
   storageKey?: string;
   initialFilters?: Record<string, string | string[]>;
   initialSort?: {columnId: string;direction: DataGridSortDirection;};
+  /**
+   * Synchronize a query selected outside the grid, for example by a summary
+   * count shortcut. Server grids should feed `onQueryChange` back into this
+   * value so the header controls and backend query remain in agreement.
+   */
+  query?: DataGridQueryState;
 };
 
 /**
@@ -204,6 +210,7 @@ export default function DataGrid<T>({
   storageKey,
   initialFilters = {},
   initialSort,
+  query,
   pagination,
   onQueryChange
 }: DataGridProps<T>) {
@@ -230,7 +237,15 @@ export default function DataGrid<T>({
   const normalizedInitialFilters = useMemo(() => normalizeInitialFilters(initialFilters), [initialFiltersKey]);
   const initialSortKey = initialSort ? `${initialSort.columnId}:${initialSort.direction}` : "";
   const normalizedInitialSort = useMemo(() => initialSort ? { ...initialSort } : undefined, [initialSortKey]);
-  const [state, setState] = useState<DataGridState>(() => mergeInitialSort(mergeInitialFilters(loadState(localStorageKey), normalizedInitialFilters), normalizedInitialSort));
+  const externalQueryKey = query ? JSON.stringify(query) : "";
+  const normalizedExternalQuery = useMemo(
+    () => query ? { sort: query.sort ? { ...query.sort } : null, filters: { ...query.filters } } : undefined,
+    [externalQueryKey]
+  );
+  const [state, setState] = useState<DataGridState>(() => mergeExternalQuery(
+    mergeInitialSort(mergeInitialFilters(loadState(localStorageKey), normalizedInitialFilters), normalizedInitialSort),
+    normalizedExternalQuery
+  ));
   const [resizeState, setResizeState] = useState<ColumnResizeState | null>(null);
   const [openFilterColumnId, setOpenFilterColumnId] = useState<string | null>(null);
   const [filterPosition, setFilterPosition] = useState<FilterPosition | null>(null);
@@ -265,6 +280,10 @@ export default function DataGrid<T>({
     setState((current) => mergeInitialSort(current, normalizedInitialSort));
   }, [normalizedInitialSort]);
 
+  useEffect(() => {
+    setState((current) => mergeExternalQuery(current, normalizedExternalQuery));
+  }, [normalizedExternalQuery]);
+
   useEffect(() => {
     try {
       window.localStorage.setItem(localStorageKey, JSON.stringify(state));
@@ -1241,6 +1260,20 @@ initialSort?: {columnId: string;direction: DataGridSortDirection;})
   return { ...state, sort: initialSort };
 }
 
+function mergeExternalQuery(state: DataGridState, query?: DataGridQueryState): DataGridState {
+  if (!query) return state;
+  const current = {
+    sort: state.sort ?? null,
+    filters: state.filters ?? {}
+  };
+  if (dataGridQueriesEqual(current, query)) return state;
+  return {
+    ...state,
+    sort: query.sort ? { ...query.sort } : null,
+    filters: { ...query.filters }
+  };
+}
+
 function formatListFilter(values: string[]): string {
   return `list:${JSON.stringify([...new Set(values)])}`;
 }
diff --git a/webui/tests/data-grid-actions.test.tsx b/webui/tests/data-grid-actions.test.tsx
index d643ca0..b8bc1e2 100644
--- a/webui/tests/data-grid-actions.test.tsx
+++ b/webui/tests/data-grid-actions.test.tsx
@@ -117,3 +117,15 @@ const clearedFilterMarkup = renderToStaticMarkup(
 );
 assertEqual(clearedFilterMarkup.includes("Ordinary row"), true, "clearing filters restores the first unfiltered row");
 assertEqual(/of(?:<!-- -->)?\s*(?:<!-- -->)?6/.test(clearedFilterMarkup), true, "clearing filters restores the full pagination total");
+
+const externalShortcutMarkup = renderToStaticMarkup(
+  <DataGrid
+    id="external-query-shortcut-regression"
+    rows={filterRows}
+    columns={filterColumns}
+    getRowKey={(row) => row.id}
+    query={{ sort: null, filters: { name: "target" } }}
+  />
+);
+assertEqual(externalShortcutMarkup.includes("Target alpha"), true, "an external count shortcut synchronizes the grid query");
+assertEqual(externalShortcutMarkup.includes("Ordinary row"), false, "the synchronized query does not disagree with visible rows");