@@ -0,0 +1,11 @@
+---
+'@hyperdx/app': patch
+---
+
+fix: run the row details query once when opening a row
+
+The side panel ran the same `SELECT *` row query twice: once for the panel, and
+again when its Overview or Column Values tab mounted. A row that was found is
+now reused from the cache, so the tab and later tab switches do not query it
+again. A different row or source still runs the query, and a row that was not
+found is looked up again.
@@ -9,6 +9,7 @@ import {
   TSource,
 } from '@hyperdx/common-utils/dist/types';
 import { Box } from '@mantine/core';
+import type { Query } from '@tanstack/react-query';
 
 import { useQueriedChartConfig } from '@/hooks/useChartConfig';
 import {
@@ -23,6 +24,7 @@ import {
   getDurationMsExpression,
   getEventBody,
 } from '@/source';
+import type { ChartQueryResult } from '@/types';
 import { getSelectExpressionsForHighlightedAttributes } from '@/utils/highlightedAttributes';
 import { getTimestampValueSelects } from '@/utils/rowTimestamps';
 
@@ -48,6 +50,14 @@ export enum ROW_DATA_ALIASES {
   EVENT_NAME = '__hdx_event_name',
 }
 
+// The side panel mounts its tabs once its own lookup settles, and each tab
+// looks the same row up again. Those lookups reuse a found row instead of
+// running `SELECT *` again. A miss stays stale so the next lookup retries it:
+// the row may not have been ingested yet.
+function rowLookupStaleTime(query: Query<ChartQueryResult>) {
+  return query.state.data?.data.length ? Infinity : 0;
+}
+
 export function useRowData({
   source,
   rowId,
@@ -289,6 +299,7 @@ export function useRowData({
       queryKey: [...baseQueryKey, dateRange],
       enabled: rowId != null && hasWindow && !isEventNameColumnPending,
       additionalQuerySettings,
+      staleTime: rowLookupStaleTime,
     },
   );
 
@@ -310,6 +321,7 @@ export function useRowData({
     queryKey: [...baseQueryKey, undefined],
     enabled: rowId != null && isFallbackActive && !isEventNameColumnPending,
     additionalQuerySettings,
+    staleTime: rowLookupStaleTime,
   });
 
   const queryResult = isFallbackActive ? fallbackResult : boundedResult;
 
@@ -0,0 +1,166 @@
+import type { ResponseJSON } from '@hyperdx/common-utils/dist/clickhouse';
+import { SourceKind, TLogSource } from '@hyperdx/common-utils/dist/types';
+import { MantineProvider } from '@mantine/core';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { render, screen, waitFor } from '@testing-library/react';
+
+import { RowDataPanel, useRowData } from '@/components/DBRowDataPanel';
+
+const mockQueryChartConfig = jest.fn();
+jest.mock('@/clickhouse', () => ({
+  useClickhouseClient: () => ({ queryChartConfig: mockQueryChartConfig }),
+}));
+jest.mock('@/hooks/useMetadata', () => ({
+  useColumns: () => ({ data: undefined, isLoading: false }),
+  useMetadataWithSettings: () => ({}),
+}));
+jest.mock('@/hooks/useMVOptimizationExplanation', () => ({
+  useMVOptimizationExplanation: () => ({ data: undefined, isLoading: false }),
+}));
+jest.mock('@/source', () => ({
+  ...jest.requireActual('@/source'),
+  useSource: () => ({ data: undefined, isLoading: false }),
+}));
+// Records the row the tab renders.
+const mockJsonViewerData = jest.fn();
+jest.mock('@/components/DBRowJsonViewer', () => ({
+  DBRowJsonViewer: ({ data }: { data: unknown }) => {
+    mockJsonViewerData(data);
+    return null;
+  },
+}));
+
+const source: TLogSource = {
+  id: 'source-id',
+  kind: SourceKind.Log,
+  name: 'logs',
+  connection: 'conn-id',
+  from: { databaseName: 'default', tableName: 'logs' },
+  timestampValueExpression: 'Timestamp',
+  defaultTableSelectExpression: 'Timestamp, Body',
+  bodyExpression: 'Body',
+};
+
+const DATE_RANGE: [Date, Date] = [
+  new Date('2024-01-01T00:00:00Z'),
+  new Date('2024-01-01T02:00:00Z'),
+];
+
+const found: ResponseJSON<Record<string, unknown>> = {
+  data: [{ Body: 'hello' }],
+  meta: [{ name: 'Body', type: 'String' }],
+  rows: 1,
+};
+
+type PanelProps = {
+  source: TLogSource;
+  rowId: string;
+  dateRange?: [Date, Date];
+};
+
+// Mirrors DBRowSidePanel: the panel shows "Loading..." until its own lookup of
+// the row settles, then mounts the tab, which looks up the same row again.
+function SidePanel(props: PanelProps) {
+  const { isLoading } = useRowData(props);
+  if (isLoading) {
+    return <div>Loading...</div>;
+  }
+  return <RowDataPanel {...props} data-testid="tab" />;
+}
+
+describe('row lookup', () => {
+  // The app's QueryClient uses React Query's defaults (pages/_app.tsx).
+  let queryClient: QueryClient;
+
+  function renderPanel(props: PanelProps) {
+    const tree = (panelProps: PanelProps) => (
+      <MantineProvider>
+        <QueryClientProvider client={queryClient}>
+          <SidePanel {...panelProps} />
+        </QueryClientProvider>
+      </MantineProvider>
+    );
+    const result = render(tree(props));
+    return {
+      rerender: (next: PanelProps) => result.rerender(tree(next)),
+      unmount: result.unmount,
+    };
+  }
+
+  async function settled() {
+    await screen.findByTestId('tab');
+    await waitFor(() => expect(queryClient.isFetching()).toBe(0));
+  }
+
+  beforeEach(() => {
+    queryClient = new QueryClient();
+    mockQueryChartConfig.mockReset().mockResolvedValue(found);
+    mockJsonViewerData.mockReset();
+  });
+
+  afterEach(() => {
+    queryClient.clear();
+  });
+
+  it.each<{ lookup: string; dateRange?: [Date, Date] }>([
+    { lookup: 'unbounded' },
+    { lookup: 'bounded', dateRange: DATE_RANGE },
+  ])(
+    'runs the $lookup lookup once for the panel and its tab',
+    async ({ dateRange }) => {
+      renderPanel({ source, rowId: "id='a'", dateRange });
+      await settled();
+
+      expect(mockQueryChartConfig).toHaveBeenCalledTimes(1);
+      expect(mockJsonViewerData).toHaveBeenLastCalledWith({ Body: 'hello' });
+    },
+  );
+
+  it('reuses a found row when the panel opens it again', async () => {
+    const first = renderPanel({ source, rowId: "id='a'" });
+    await settled();
+    first.unmount();
+
+    renderPanel({ source, rowId: "id='a'" });
+    await settled();
+
+    expect(mockQueryChartConfig).toHaveBeenCalledTimes(1);
+    expect(mockJsonViewerData).toHaveBeenLastCalledWith({ Body: 'hello' });
+  });
+
+  it('runs again for another row', async () => {
+    const { rerender } = renderPanel({ source, rowId: "id='a'" });
+    await settled();
+    rerender({ source, rowId: "id='b'" });
+    await settled();
+
+    expect(
+      mockQueryChartConfig.mock.calls.map(([{ config }]) => config.where),
+    ).toEqual(["id='a'", "id='b'"]);
+  });
+
+  it('runs again for another source', async () => {
+    const { rerender } = renderPanel({ source, rowId: "id='a'" });
+    await settled();
+    rerender({
+      source: { ...source, from: { ...source.from, tableName: 'logs_v2' } },
+      rowId: "id='a'",
+    });
+    await settled();
+
+    expect(
+      mockQueryChartConfig.mock.calls.map(
+        ([{ config }]) => config.from.tableName,
+      ),
+    ).toEqual(['logs', 'logs_v2']);
+  });
+
+  it('runs again for a row it did not find', async () => {
+    mockQueryChartConfig.mockResolvedValue({ data: [], meta: [], rows: 0 });
+
+    renderPanel({ source, rowId: "id='a'" });
+    await settled();
+
+    expect(mockQueryChartConfig).toHaveBeenCalledTimes(2);
+  });
+});