diff --git a/apps/desktop/src/components/editor/EditorSettingsDialog.vue b/apps/desktop/src/components/editor/EditorSettingsDialog.vue
index e71dc40bd6..3fd1af7399 100644
--- a/apps/desktop/src/components/editor/EditorSettingsDialog.vue
+++ b/apps/desktop/src/components/editor/EditorSettingsDialog.vue
@@ -661,6 +661,7 @@ const debugLogCopied = ref(false);
 const debugLogDownloaded = ref(false);
 const editShowColumnCommentsInHeader = ref(settingsStore.editorSettings.showColumnCommentsInHeader);
 const editShowColumnTypesInHeader = ref(settingsStore.editorSettings.showColumnTypesInHeader);
+const editShowColumnHeaderTooltips = ref(settingsStore.editorSettings.showColumnHeaderTooltips);
 const editShowResultSourceDatabase = ref(settingsStore.editorSettings.showResultSourceDatabase);
 const editDataGridShowTransposeFieldMetadata = ref(settingsStore.editorSettings.dataGridShowTransposeFieldMetadata);
 const editColorizeDataGridCellTypes = ref(settingsStore.editorSettings.colorizeDataGridCellTypes);
@@ -1003,6 +1004,7 @@ function currentEditorSettingsDraft(): EditorSettingsDraft {
     tabSortMode: editTabSortMode.value,
     showColumnCommentsInHeader: editShowColumnCommentsInHeader.value,
     showColumnTypesInHeader: editShowColumnTypesInHeader.value,
+    showColumnHeaderTooltips: editShowColumnHeaderTooltips.value,
     showResultSourceDatabase: editShowResultSourceDatabase.value,
     dataGridShowTransposeFieldMetadata: editDataGridShowTransposeFieldMetadata.value,
     colorizeDataGridCellTypes: editColorizeDataGridCellTypes.value,
@@ -1649,6 +1651,7 @@ function syncEditorSettingsDraftFromStore() {
   editTabSortMode.value = settingsStore.editorSettings.tabSortMode;
   editShowColumnCommentsInHeader.value = settingsStore.editorSettings.showColumnCommentsInHeader;
   editShowColumnTypesInHeader.value = settingsStore.editorSettings.showColumnTypesInHeader;
+  editShowColumnHeaderTooltips.value = settingsStore.editorSettings.showColumnHeaderTooltips;
   editShowResultSourceDatabase.value = settingsStore.editorSettings.showResultSourceDatabase;
   editDataGridShowTransposeFieldMetadata.value = settingsStore.editorSettings.dataGridShowTransposeFieldMetadata;
   editColorizeDataGridCellTypes.value = settingsStore.editorSettings.colorizeDataGridCellTypes;
@@ -1783,6 +1786,7 @@ const editorSettingsDraftRefs: EditorSettingsDraftRefMap = {
   tabSortMode: editTabSortMode,
   showColumnCommentsInHeader: editShowColumnCommentsInHeader,
   showColumnTypesInHeader: editShowColumnTypesInHeader,
+  showColumnHeaderTooltips: editShowColumnHeaderTooltips,
   showResultSourceDatabase: editShowResultSourceDatabase,
   dataGridShowTransposeFieldMetadata: editDataGridShowTransposeFieldMetadata,
   colorizeDataGridCellTypes: editColorizeDataGridCellTypes,
@@ -2308,6 +2312,7 @@ function resetDefaultsForTab(tab: SettingsCategory) {
     historyRetention.reset();
     editShowColumnCommentsInHeader.value = DEFAULT_EDITOR_SETTINGS.showColumnCommentsInHeader;
     editShowColumnTypesInHeader.value = DEFAULT_EDITOR_SETTINGS.showColumnTypesInHeader;
+    editShowColumnHeaderTooltips.value = DEFAULT_EDITOR_SETTINGS.showColumnHeaderTooltips;
     editShowResultSourceDatabase.value = DEFAULT_EDITOR_SETTINGS.showResultSourceDatabase;
     editDataGridShowTransposeFieldMetadata.value = DEFAULT_EDITOR_SETTINGS.dataGridShowTransposeFieldMetadata;
     editColorizeDataGridCellTypes.value = DEFAULT_EDITOR_SETTINGS.colorizeDataGridCellTypes;
@@ -2416,6 +2421,7 @@ function resetAllDefaults() {
   editSidebarTablePageSize.value = DEFAULT_SIDEBAR_TABLE_PAGE_SIZE;
   editShowColumnCommentsInHeader.value = DEFAULT_EDITOR_SETTINGS.showColumnCommentsInHeader;
   editShowColumnTypesInHeader.value = DEFAULT_EDITOR_SETTINGS.showColumnTypesInHeader;
+  editShowColumnHeaderTooltips.value = DEFAULT_EDITOR_SETTINGS.showColumnHeaderTooltips;
   editDataGridShowTransposeFieldMetadata.value = DEFAULT_EDITOR_SETTINGS.dataGridShowTransposeFieldMetadata;
   editColorizeDataGridCellTypes.value = DEFAULT_EDITOR_SETTINGS.colorizeDataGridCellTypes;
   // Reset the selection only; saved schemes survive a full settings reset.
@@ -7952,6 +7958,17 @@ onUnmounted(() => {
                   </div>
                   <Switch id="show-column-types-in-header" v-model="editShowColumnTypesInHeader" />
                 </div>
+                <div class="settings-item flex items-center justify-between gap-4 rounded-md border bg-muted/20 px-3 py-2">
+                  <div class="space-y-1">
+                    <Label for="show-column-header-tooltips">
+                      {{ t("settings.showColumnHeaderTooltips") }}
+                    </Label>
+                    <p class="text-xs text-muted-foreground">
+                      {{ t("settings.showColumnHeaderTooltipsDescription") }}
+                    </p>
+                  </div>
+                  <Switch id="show-column-header-tooltips" v-model="editShowColumnHeaderTooltips" />
+                </div>
                 <div class="settings-item flex items-center justify-between gap-4 rounded-md border bg-muted/20 px-3 py-2">
                   <div class="space-y-1">
                     <Label for="show-result-source-database">
diff --git a/apps/desktop/src/components/grid/DataGrid.vue b/apps/desktop/src/components/grid/DataGrid.vue
index 3255805a1e..031c065fcc 100644
--- a/apps/desktop/src/components/grid/DataGrid.vue
+++ b/apps/desktop/src/components/grid/DataGrid.vue
@@ -760,6 +760,7 @@ const dataGridTopbarOverflowActionCount = ref(0);
 const dataGridTopbarExpandedRequiredWidth = ref(0);
 const showColumnCommentsInHeader = computed(() => settingsStore.editorSettings.showColumnCommentsInHeader);
 const showColumnTypesInHeader = computed(() => settingsStore.editorSettings.showColumnTypesInHeader);
+const showColumnHeaderTooltips = computed(() => settingsStore.editorSettings.showColumnHeaderTooltips !== false);
 const showTransposeFieldMetadata = computed(() => settingsStore.editorSettings.dataGridShowTransposeFieldMetadata);
 const showIndexIndicatorsInHeader = computed(() => settingsStore.editorSettings.showIndexIndicatorsInHeader !== false);
 const indexes = ref<IndexInfo[]>([]);
@@ -12740,7 +12741,7 @@ useUpdateBlocker(() => (hasPendingChanges.value || hasPendingDataEditorDraft.val
                     :dark="isDark"
                     :frozen="col.visibleColIdx < frozenColumnCount"
                     :frozen-separator="frozenColumnCount > 0 && col.visibleColIdx === frozenColumnCount - 1"
-                    :tooltip-disabled="columnHeaderTooltipsDisabled"
+                    :tooltip-disabled="columnHeaderTooltipsDisabled || !showColumnHeaderTooltips"
                     :column-type="headerColumnType(col.name, col.actualColIdx)"
                     :column-comment="headerColumnComment(col.name, col.actualColIdx)"
                     :show-type-line="reserveColumnTypeLine"
diff --git a/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts b/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
index 80401a2411..c538c05e8c 100644
--- a/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
+++ b/apps/desktop/src/components/grid/__tests__/DataGridSurfaces.spec.ts
@@ -1,11 +1,13 @@
 // @vitest-environment happy-dom
 
 import { readFileSync } from "node:fs";
-import { nextTick } from "vue";
+import { createApp, defineComponent, h, nextTick } from "vue";
 import { beforeEach, describe, expect, it, vi } from "vitest";
+import { createPinia, setActivePinia } from "pinia";
 import { dispatch, findAll, findOne, hostText, mountComponent } from "./vueHostHarness";
 import type { DataGridCellDetail } from "@/lib/dataGrid/dataGridDetail";
 
+const settingsMock = vi.hoisted(() => ({ store: null as any }));
 const mocks = vi.hoisted(() => ({
   editor: { create: vi.fn(), destroy: vi.fn(), setValue: vi.fn(), openSearch: vi.fn() },
   updateSettings: vi.fn(),
@@ -16,40 +18,15 @@ const mocks = vi.hoisted(() => ({
   toast: vi.fn(),
 }));
 
-vi.mock("vue-i18n", () => ({ useI18n: () => ({ t: (key: string) => key }) }));
+vi.mock("vue-i18n", () => ({
+  useI18n: () => ({ t: (key: string) => key, locale: { value: "en" } }),
+  // DataGrid.vue's import graph reaches @/i18n, which builds a real i18n instance at module scope.
+  createI18n: () => ({ install: () => {}, global: { t: (key: string) => key, locale: { value: "en" } } }),
+}));
 vi.mock("@lucide/vue", async () => {
   const { createPassthroughStub } = await import("./vueHostHarness");
   const icon = createPassthroughStub("Icon", "i");
-  return {
-    Check: icon,
-    CaseSensitive: icon,
-    ChevronDown: icon,
-    ChevronUp: icon,
-    ChevronLeft: icon,
-    ChevronRight: icon,
-    ChevronsLeft: icon,
-    ChevronsRight: icon,
-    Download: icon,
-    ChevronsDown: icon,
-    Filter: icon,
-    Focus: icon,
-    FileDiff: icon,
-    Loader2: icon,
-    FileUp: icon,
-    Upload: icon,
-    Search: icon,
-    X: icon,
-    Code2: icon,
-    Copy: icon,
-    Eye: icon,
-    EyeOff: icon,
-    GripVertical: icon,
-    Info: icon,
-    Pencil: icon,
-    Plus: icon,
-    RotateCcw: icon,
-    Trash2: icon,
-  };
+  return new Proxy({}, { get: (_target, key) => (key === "__esModule" ? false : icon), has: () => true });
 });
 
 vi.mock("@/components/ui/button", async () => ({ Button: (await import("./vueHostHarness")).createPassthroughStub("Button", "button") }));
@@ -72,7 +49,7 @@ vi.mock("@/components/ui/dropdown-menu", async () => {
 });
 vi.mock("@/components/ui/popover", async () => {
   const { createPassthroughStub } = await import("./vueHostHarness");
-  return { Popover: createPassthroughStub("Popover"), PopoverContent: createPassthroughStub("PopoverContent"), PopoverTrigger: createPassthroughStub("PopoverTrigger") };
+  return { Popover: createPassthroughStub("Popover"), PopoverAnchor: createPassthroughStub("PopoverAnchor"), PopoverContent: createPassthroughStub("PopoverContent"), PopoverTrigger: createPassthroughStub("PopoverTrigger") };
 });
 vi.mock("@/components/ui/tooltip", async () => {
   const { createPassthroughStub } = await import("./vueHostHarness");
@@ -90,8 +67,24 @@ vi.mock("@/components/ui/LightTooltip.vue", async () => ({ default: (await impor
 vi.mock("@/components/grid/TemporalCellEditor.vue", async () => ({ default: (await import("./vueHostHarness")).createPassthroughStub("TemporalCellEditor") }));
 vi.mock("@/components/grid/DataGridValueTransform.vue", async () => ({ default: (await import("./vueHostHarness")).createPassthroughStub("DataGridValueTransform") }));
 vi.mock("@/composables/useCellDetailEditor", () => ({ useCellDetailEditor: () => mocks.editor }));
-vi.mock("@/composables/useTheme", () => ({ useTheme: () => ({ isDark: { value: false }, themePalette: { value: {} } }) }));
-vi.mock("@/stores/settingsStore", () => ({ useSettingsStore: () => ({ editorSettings: { cellDetailJsonFormatted: true, theme: "default", fontSize: 13, fontFamily: "monospace" }, updateEditorSettings: mocks.updateSettings }) }));
+vi.mock("@/composables/useTheme", async () => {
+  const { ref } = await import("vue");
+  // Real refs: DataGrid.vue both watches isDark and binds it to a Boolean prop.
+  const isDark = ref(false);
+  const themePalette = ref({});
+  return { useTheme: () => ({ isDark, themePalette }) };
+});
+vi.mock("@/stores/settingsStore", async () => {
+  const actual = await vi.importActual<typeof import("@/stores/settingsStore")>("@/stores/settingsStore");
+  const { reactive } = await import("vue");
+  // Reactive and complete: DataGrid.vue reads dozens of editor settings and must
+  // re-render when a test flips one.
+  settingsMock.store = {
+    editorSettings: reactive({ ...actual.DEFAULT_EDITOR_SETTINGS, cellDetailJsonFormatted: true, theme: "default", fontSize: 13, fontFamily: "monospace" }),
+    updateEditorSettings: mocks.updateSettings,
+  };
+  return { ...actual, useSettingsStore: () => settingsMock.store };
+});
 vi.mock("@/lib/dataGrid/geometryPreview", () => ({ isHexGeometry: () => false, renderWktOnCanvas: mocks.renderWkt }));
 vi.mock("@/lib/common/clipboard", () => ({ copyToClipboard: mocks.copyToClipboard }));
 vi.mock("@/composables/useToast", () => ({ useToast: () => ({ toast: mocks.toast }) }));
@@ -107,6 +100,7 @@ vi.mock("@/composables/useDataGridCellDetail", async () => {
 
 import DataGridCellDetailDialog from "@/components/grid/DataGridCellDetailDialog.vue";
 import DataGridCellDetailPanel from "@/components/grid/DataGridCellDetailPanel.vue";
+import DataGrid from "@/components/grid/DataGrid.vue";
 import DataGridColumnHeader from "@/components/grid/DataGridColumnHeader.vue";
 import DataGridCopyColumnNamesDialog from "@/components/grid/DataGridCopyColumnNamesDialog.vue";
 import DataGridFilterBuilder from "@/components/grid/DataGridFilterBuilder.vue";
@@ -1870,3 +1864,44 @@ describe("DataGridCopyColumnNamesDialog", () => {
     expect(previewText(mounted)).toBe("id\ttype");
   });
 });
+
+describe("DataGrid column header tooltips", () => {
+  // The rest of this file drives leaf components through the host renderer, but
+  // DataGrid.vue touches the DOM directly (querySelector/observers), so this
+  // case mounts it into happy-dom instead.
+  function mountDataGrid() {
+    setActivePinia(createPinia());
+    const host = document.createElement("div");
+    document.body.appendChild(host);
+    const app = createApp(defineComponent({ setup: () => () => h(DataGrid, { result: { columns: ["id", "name"], rows: [[1, "a"]] } }) }));
+    app.mount(host);
+    return {
+      host,
+      // `disabled` is not one of Vue's special boolean attributes, so binding it
+      // on the LightTooltip stub's <div> renders the literal "true"/"false".
+      headerTooltipsDisabled: () => [...host.querySelectorAll('[data-grid-column-index] [data-stub="LightTooltip"]')].map((node) => node.getAttribute("disabled") === "true"),
+      destroy() {
+        app.unmount();
+        host.remove();
+      },
+    };
+  }
+
+  it("follows the showColumnHeaderTooltips preference", async () => {
+    const grid = mountDataGrid();
+    await nextTick();
+
+    expect(settingsMock.store.editorSettings.showColumnHeaderTooltips).toBe(true);
+    expect(grid.headerTooltipsDisabled()).toEqual([false, false]);
+
+    settingsMock.store.editorSettings.showColumnHeaderTooltips = false;
+    await nextTick();
+    expect(grid.headerTooltipsDisabled()).toEqual([true, true]);
+
+    settingsMock.store.editorSettings.showColumnHeaderTooltips = true;
+    await nextTick();
+    expect(grid.headerTooltipsDisabled()).toEqual([false, false]);
+
+    grid.destroy();
+  });
+});
diff --git a/apps/desktop/src/i18n/locales/az.ts b/apps/desktop/src/i18n/locales/az.ts
index a521e262d0..3787cc52a3 100644
--- a/apps/desktop/src/i18n/locales/az.ts
+++ b/apps/desktop/src/i18n/locales/az.ts
@@ -7313,6 +7313,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "Cədvəl sütunlarının şərhlərini birbaşa sütun adlarının altında göstər.",
     showColumnTypesInHeader: "Sütun növlərini adların altında göstər",
     showColumnTypesInHeaderDescription: "Hər sütunun verilən növünü birbaşa cədvəldəki sütun adlarının altında göstər.",
+    showColumnHeaderTooltips: "Sütun başlığı üzərinə gətirildikdə ipucları",
+    showColumnHeaderTooltipsDescription: "Kursor nəticə cədvəlindəki sütun başlıqlarının üzərinə gətirildikdə ətraflı ipucları göstər. Bu pəncərələri dayandırmaq üçün söndürün.",
     showResultSourceDatabase: "Nəticə adlarında verilənlər bazası adını göstər",
     showResultSourceDatabaseDescription: "Söndürüldükdə nəticə sekmələri yalnız cədvəl adını göstərir; tam ad (verilənlər bazası adı ilə) ipucunda görünməyə davam edir.",
     dataGridShowTransposeFieldMetadata: "Transpozisiya görünüşündə sahə metaverilənlərini göstər",
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 38bddc7fe6..6f488322d7 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -7961,6 +7961,8 @@ export default {
     showColumnCommentsInHeaderDescription: "Display table column comments directly below grid column names.",
     showColumnTypesInHeader: "Show column types under names",
     showColumnTypesInHeaderDescription: "Display each column's data type directly below grid column names.",
+    showColumnHeaderTooltips: "Column header hover tooltips",
+    showColumnHeaderTooltipsDescription: "Show detail tooltips when hovering result grid column headers. Turn off to stop hover popups.",
     showResultSourceDatabase: "Include database name in result set names",
     showResultSourceDatabaseDescription: "When off, result set tabs show only the table name; the full name stays visible in the tooltip.",
     dataGridShowTransposeFieldMetadata: "Show field metadata in transpose view",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index d3cf1470c2..c313633671 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -7339,6 +7339,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "Muestra los comentarios de columnas directamente debajo del nombre de la columna.",
     showColumnTypesInHeader: "Mostrar tipos de columna bajo los nombres",
     showColumnTypesInHeaderDescription: "Muestra el tipo de dato de cada columna directamente debajo del nombre de la columna.",
+    showColumnHeaderTooltips: "Sugerencias al pasar el cursor por los encabezados de columna",
+    showColumnHeaderTooltipsDescription: "Muestra sugerencias con detalles al pasar el cursor sobre los encabezados de columna de la cuadrícula de resultados. Desactívalo para ocultarlas.",
     showResultSourceDatabase: "Incluir el nombre de la base de datos en los nombres de los resultados",
     showResultSourceDatabaseDescription: "Si se desactiva, las pestañas de resultados solo muestran el nombre de la tabla; el nombre completo sigue visible en la información emergente.",
     dataGridShowTransposeFieldMetadata: "Mostrar metadatos de campo en la vista transpuesta",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index 00064dad7e..662946db77 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -7263,6 +7263,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "Visualizza i commenti delle colonne della tabella direttamente sotto i nomi delle colonne nella griglia.",
     showColumnTypesInHeader: "Mostra i tipi di colonna sotto i nomi",
     showColumnTypesInHeaderDescription: "Visualizza il tipo di dato di ciascuna colonna direttamente sotto i nomi delle colonne nella griglia.",
+    showColumnHeaderTooltips: "Tooltip al passaggio del mouse sulle intestazioni di colonna",
+    showColumnHeaderTooltipsDescription: "Mostra tooltip con dettagli al passaggio del mouse sulle intestazioni di colonna della griglia dei risultati. Disattiva per nasconderli.",
     showResultSourceDatabase: "Includi il nome del database nei nomi dei risultati",
     showResultSourceDatabaseDescription: "Se disattivato, le schede dei risultati mostrano solo il nome della tabella; il nome completo resta visibile nel tooltip.",
     dataGridShowTransposeFieldMetadata: "Mostra i metadati dei campi nella vista trasposta",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 93ca7a206e..789e4b3954 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -7296,6 +7296,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "グリッド列名の直下にテーブル列コメントを表示します。",
     showColumnTypesInHeader: "列名の下にデータ型を表示",
     showColumnTypesInHeaderDescription: "グリッド列名の直下に各列のデータ型を表示します。",
+    showColumnHeaderTooltips: "列ヘッダーのホバーツールチップ",
+    showColumnHeaderTooltipsDescription: "結果グリッドの列ヘッダーにホバーしたときに詳細ツールチップを表示します。オフにすると表示されません。",
     showResultSourceDatabase: "結果セット名にデータベース名を含める",
     showResultSourceDatabaseDescription: "オフにすると結果セットのタブにはテーブル名のみを表示し、完全な名前（データベース名を含む）はツールチップで確認できます。",
     dataGridShowTransposeFieldMetadata: "転置ビューにフィールドメタデータを表示",
diff --git a/apps/desktop/src/i18n/locales/ko.ts b/apps/desktop/src/i18n/locales/ko.ts
index 0cb00d2e74..9efd0da00f 100644
--- a/apps/desktop/src/i18n/locales/ko.ts
+++ b/apps/desktop/src/i18n/locales/ko.ts
@@ -7043,6 +7043,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "그리드 컬럼 이름 바로 아래에 테이블 컬럼 주석을 표시합니다.",
     showColumnTypesInHeader: "이름 아래에 컬럼 타입 표시",
     showColumnTypesInHeaderDescription: "그리드 컬럼 이름 바로 아래에 각 컬럼의 데이터 타입을 표시합니다.",
+    showColumnHeaderTooltips: "컬럼 헤더 호버 툴팁",
+    showColumnHeaderTooltipsDescription: "결과 그리드의 컬럼 헤더에 마우스를 올리면 상세 툴팁을 표시합니다. 끄면 표시되지 않습니다.",
     showResultSourceDatabase: "결과 세트 이름에 데이터베이스 이름 포함",
     showResultSourceDatabaseDescription: "끄면 결과 세트 탭에 테이블 이름만 표시되며, 전체 이름(데이터베이스 이름 포함)은 툴팁에서 확인할 수 있습니다.",
     dataGridShowTransposeFieldMetadata: "전치 보기에 필드 메타데이터 표시",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index 297498d335..e045c17e37 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -7265,6 +7265,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "Exibir comentários de colunas da tabela diretamente abaixo dos nomes das colunas da grade.",
     showColumnTypesInHeader: "Mostrar tipos de coluna sob os nomes",
     showColumnTypesInHeaderDescription: "Exibir o tipo de dado de cada coluna diretamente abaixo dos nomes das colunas da grade.",
+    showColumnHeaderTooltips: "Dicas ao passar o mouse nos cabeçalhos de coluna",
+    showColumnHeaderTooltipsDescription: "Mostra dicas com detalhes ao passar o mouse sobre os cabeçalhos de coluna da grade de resultados. Desative para ocultá-las.",
     showResultSourceDatabase: "Incluir o nome do banco de dados nos nomes dos resultados",
     showResultSourceDatabaseDescription: "Quando desativado, as abas de resultados mostram apenas o nome da tabela; o nome completo (com o banco de dados) continua na dica de ferramenta.",
     dataGridShowTransposeFieldMetadata: "Mostrar metadados de campo na visualização transposta",
diff --git a/apps/desktop/src/i18n/locales/ru.ts b/apps/desktop/src/i18n/locales/ru.ts
index ab250e3573..734c514b3a 100644
--- a/apps/desktop/src/i18n/locales/ru.ts
+++ b/apps/desktop/src/i18n/locales/ru.ts
@@ -9428,6 +9428,8 @@ export default withEnglishFallback({
     shortcutLowercaseSelection: "Преобразовать выделенное в нижний регистр",
     shortcutConvertNamingStyle: "Переключить стиль именования",
     shortcutExPasteSqlInCondition: "ExPaste: вставить как условие IN",
+    showColumnHeaderTooltips: "Всплывающие подсказки при наведении на имена полей",
+    showColumnHeaderTooltipsDescription: "Показывать подробную всплывающую подсказку при наведении курсора на имя поля в заголовке результатов; после отключения всплывающая подсказка при наведении больше не появляется.",
     showResultSourceDatabase: "Имя набора результатов содержит имя базы данных",
     showResultSourceDatabaseDescription: "После отключения вкладки наборов результатов будут отображать только имена таблиц; полное имя (включая имя базы данных) по-прежнему можно посмотреть во всплывающей подсказке.",
   },
diff --git a/apps/desktop/src/i18n/locales/tr.ts b/apps/desktop/src/i18n/locales/tr.ts
index 5a328914f4..c12ac49ffd 100644
--- a/apps/desktop/src/i18n/locales/tr.ts
+++ b/apps/desktop/src/i18n/locales/tr.ts
@@ -7195,6 +7195,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "Tablo sütun açıklamalarını doğrudan ızgara sütun adlarının altında göster.",
     showColumnTypesInHeader: "Sütun türlerini adların altında göster",
     showColumnTypesInHeaderDescription: "Her sütunun veri türünü doğrudan ızgara sütun adlarının altında göster.",
+    showColumnHeaderTooltips: "Sütun başlığı ipuçları",
+    showColumnHeaderTooltipsDescription: "Sonuç ızgarasında sütun başlıklarının üzerine gelindiğinde ayrıntı ipuçlarını göster. Açılır ipuçlarını durdurmak için kapatın.",
     showResultSourceDatabase: "Sonuç adlarında veritabanı adını göster",
     showResultSourceDatabaseDescription: "Kapalıyken sonuç sekmeleri yalnızca tablo adını gösterir; tam ad (veritabanı adı dahil) ipucunda görünmeye devam eder.",
     dataGridShowTransposeFieldMetadata: "Devrik görünümde alan meta verisini göster",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index c214e48ad0..c343e8e865 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -7933,6 +7933,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "把表字段注释直接显示在结果表头字段名下方。",
     showColumnTypesInHeader: "在字段名下方显示数据类型",
     showColumnTypesInHeaderDescription: "把每个字段的数据类型直接显示在结果表头字段名下方。",
+    showColumnHeaderTooltips: "字段名悬浮提示",
+    showColumnHeaderTooltipsDescription: "在结果表头字段名上悬浮时显示详情提示；关闭后悬浮不再弹出。",
     showResultSourceDatabase: "结果集名称包含数据库名",
     showResultSourceDatabaseDescription: "关闭后结果集页签只显示表名，完整名称（含数据库名）仍可在悬浮提示中查看。",
     dataGridShowTransposeFieldMetadata: "在转置视图中显示字段元数据",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index a43e69cbbc..451affbf11 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -6582,6 +6582,8 @@ export default withEnglishFallback({
     showColumnCommentsInHeaderDescription: "直接在資料表格欄位名稱下方顯示資料表欄位註解。",
     showColumnTypesInHeader: "在欄位名稱下方顯示資料類型",
     showColumnTypesInHeaderDescription: "直接在資料表格欄位名稱下方顯示每個欄位的資料類型。",
+    showColumnHeaderTooltips: "欄位名稱懸浮提示",
+    showColumnHeaderTooltipsDescription: "在資料表格欄位名稱上懸浮時顯示詳細提示；關閉後懸浮不再彈出。",
     showResultSourceDatabase: "結果集名稱包含資料庫名稱",
     showResultSourceDatabaseDescription: "關閉後結果集頁籤只顯示資料表名稱，完整名稱（含資料庫名稱）仍可在懸浮提示中查看。",
     dataGridShowTransposeFieldMetadata: "在轉置檢視中顯示欄位中繼資料",
diff --git a/apps/desktop/src/lib/settings/__tests__/settingsTransfer.spec.ts b/apps/desktop/src/lib/settings/__tests__/settingsTransfer.spec.ts
index 2c0fc2ea89..34e5145dde 100644
--- a/apps/desktop/src/lib/settings/__tests__/settingsTransfer.spec.ts
+++ b/apps/desktop/src/lib/settings/__tests__/settingsTransfer.spec.ts
@@ -108,6 +108,21 @@ describe("settingsTransfer", () => {
     expect(result.error.detail).toContain("wordWrap");
   });
 
+  it("transfers the column header hover tooltip preference as a data setting", () => {
+    expect(transferCategoryForKey("showColumnHeaderTooltips")).toBe("data");
+
+    const result = parseSettingsTransferFile(fileWith({ showColumnHeaderTooltips: false }));
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.value.editorSettings.showColumnHeaderTooltips).toBe(false);
+    expect(result.value.categories).toContain("data");
+
+    const rejected = parseSettingsTransferFile(fileWith({ showColumnHeaderTooltips: "no" }));
+    expect(rejected.ok).toBe(false);
+    if (rejected.ok) return;
+    expect(rejected.error.detail).toContain("showColumnHeaderTooltips");
+  });
+
   it("rejects toolbar items whose known keys are not booleans", () => {
     const result = parseSettingsTransferFile(fileWith({ toolbarItems: { dataTransfer: "yes" } }));
     expect(result.ok).toBe(false);
diff --git a/apps/desktop/src/lib/settings/editorSettingsDraft.ts b/apps/desktop/src/lib/settings/editorSettingsDraft.ts
index 10944cc6ac..35c6e79b45 100644
--- a/apps/desktop/src/lib/settings/editorSettingsDraft.ts
+++ b/apps/desktop/src/lib/settings/editorSettingsDraft.ts
@@ -46,6 +46,7 @@ export const EDITOR_SETTINGS_DRAFT_KEYS = [
   "tabSortMode",
   "showColumnCommentsInHeader",
   "showColumnTypesInHeader",
+  "showColumnHeaderTooltips",
   "showResultSourceDatabase",
   "dataGridShowTransposeFieldMetadata",
   "colorizeDataGridCellTypes",
diff --git a/apps/desktop/src/lib/settings/settingsSearch.ts b/apps/desktop/src/lib/settings/settingsSearch.ts
index fbed94c2b6..b92d1fbd1b 100644
--- a/apps/desktop/src/lib/settings/settingsSearch.ts
+++ b/apps/desktop/src/lib/settings/settingsSearch.ts
@@ -221,6 +221,7 @@ export const SETTINGS_SEARCH_DEFINITIONS: readonly SettingsSearchDefinition[] =
   { id: "query-result-max-rows", category: "data", titleKey: "settings.queryResultMaxRows", descriptionKey: "settings.queryResultMaxRowsDescription", targetId: "data" },
   { id: "data-grid-header-comments", category: "data", titleKey: "settings.showColumnCommentsInHeader", descriptionKey: "settings.showColumnCommentsInHeaderDescription", targetId: "data" },
   { id: "data-grid-header-types", category: "data", titleKey: "settings.showColumnTypesInHeader", descriptionKey: "settings.showColumnTypesInHeaderDescription", targetId: "data" },
+  { id: "data-grid-header-tooltips", category: "data", titleKey: "settings.showColumnHeaderTooltips", descriptionKey: "settings.showColumnHeaderTooltipsDescription", targetId: "data" },
   { id: "result-source-database-name", category: "data", titleKey: "settings.showResultSourceDatabase", descriptionKey: "settings.showResultSourceDatabaseDescription", targetId: "data" },
   { id: "data-grid-transpose-field-metadata", category: "data", titleKey: "settings.dataGridShowTransposeFieldMetadata", descriptionKey: "settings.dataGridShowTransposeFieldMetadataDescription", targetId: "data" },
   { id: "data-grid-cell-type-colors", category: "data", titleKey: "settings.colorizeDataGridCellTypes", descriptionKey: "settings.colorizeDataGridCellTypesDescription", targetId: "data" },
diff --git a/apps/desktop/src/lib/settings/settingsTransfer.ts b/apps/desktop/src/lib/settings/settingsTransfer.ts
index 1c448c1792..629092739f 100644
--- a/apps/desktop/src/lib/settings/settingsTransfer.ts
+++ b/apps/desktop/src/lib/settings/settingsTransfer.ts
@@ -140,6 +140,7 @@ const SETTINGS_TRANSFER_CATEGORY_KEYS: Record<SettingsTransferCategoryId, readon
   data: [
     "showColumnCommentsInHeader",
     "showColumnTypesInHeader",
+    "showColumnHeaderTooltips",
     "showResultSourceDatabase",
     "dataGridShowTransposeFieldMetadata",
     "colorizeDataGridCellTypes",
@@ -269,6 +270,7 @@ const PASS_THROUGH_BOOLEAN_KEYS = [
   "confirmUnsavedSqlClose",
   "showColumnCommentsInHeader",
   "showColumnTypesInHeader",
+  "showColumnHeaderTooltips",
   "showResultSourceDatabase",
   "colorizeDataGridCellTypes",
   "showIndexIndicatorsInHeader",
diff --git a/apps/desktop/src/stores/settingsStore.ts b/apps/desktop/src/stores/settingsStore.ts
index ac8d727c55..82637b02cf 100644
--- a/apps/desktop/src/stores/settingsStore.ts
+++ b/apps/desktop/src/stores/settingsStore.ts
@@ -871,6 +871,7 @@ export interface EditorSettings {
   mongoViewMode: "document" | "table";
   showColumnCommentsInHeader: boolean;
   showColumnTypesInHeader: boolean;
+  showColumnHeaderTooltips: boolean;
   /** 结果集页签/结果列表的名称是否带上库名（关闭后只显示表名，完整名称仍在悬浮提示中）。 */
   showResultSourceDatabase: boolean;
   dataGridShowTransposeFieldMetadata: boolean;
@@ -1151,6 +1152,7 @@ export const DEFAULT_EDITOR_SETTINGS: EditorSettings = {
   mongoViewMode: "document",
   showColumnCommentsInHeader: true,
   showColumnTypesInHeader: true,
+  showColumnHeaderTooltips: true,
   showResultSourceDatabase: true,
   dataGridShowTransposeFieldMetadata: false,
   colorizeDataGridCellTypes: false,
@@ -1707,6 +1709,7 @@ export function normalizeEditorSettings(settings: Partial<EditorSettings>, exist
     mongoViewMode: settings.mongoViewMode === "table" ? "table" : DEFAULT_EDITOR_SETTINGS.mongoViewMode,
     showColumnCommentsInHeader: settings.showColumnCommentsInHeader ?? DEFAULT_EDITOR_SETTINGS.showColumnCommentsInHeader,
     showColumnTypesInHeader: settings.showColumnTypesInHeader ?? DEFAULT_EDITOR_SETTINGS.showColumnTypesInHeader,
+    showColumnHeaderTooltips: settings.showColumnHeaderTooltips ?? DEFAULT_EDITOR_SETTINGS.showColumnHeaderTooltips,
     showResultSourceDatabase: settings.showResultSourceDatabase ?? DEFAULT_EDITOR_SETTINGS.showResultSourceDatabase,
     dataGridShowTransposeFieldMetadata: settings.dataGridShowTransposeFieldMetadata === true,
     colorizeDataGridCellTypes: settings.colorizeDataGridCellTypes ?? DEFAULT_EDITOR_SETTINGS.colorizeDataGridCellTypes,
@@ -2529,6 +2532,7 @@ export const useSettingsStore = defineStore("settings", () => {
     if (partial.mongoViewMode !== undefined) editorSettings.value.mongoViewMode = partial.mongoViewMode;
     if (partial.showColumnCommentsInHeader !== undefined) editorSettings.value.showColumnCommentsInHeader = partial.showColumnCommentsInHeader;
     if (partial.showColumnTypesInHeader !== undefined) editorSettings.value.showColumnTypesInHeader = partial.showColumnTypesInHeader;
+    if (partial.showColumnHeaderTooltips !== undefined) editorSettings.value.showColumnHeaderTooltips = partial.showColumnHeaderTooltips;
     if (partial.showResultSourceDatabase !== undefined) editorSettings.value.showResultSourceDatabase = partial.showResultSourceDatabase;
     if (partial.dataGridShowTransposeFieldMetadata !== undefined) editorSettings.value.dataGridShowTransposeFieldMetadata = partial.dataGridShowTransposeFieldMetadata === true;
     if (partial.colorizeDataGridCellTypes !== undefined) editorSettings.value.colorizeDataGridCellTypes = partial.colorizeDataGridCellTypes === true;
diff --git a/packages/app-tests/editorSettingsDraft.test.ts b/packages/app-tests/editorSettingsDraft.test.ts
index c08055f0f1..de2fcf140d 100644
--- a/packages/app-tests/editorSettingsDraft.test.ts
+++ b/packages/app-tests/editorSettingsDraft.test.ts
@@ -57,6 +57,16 @@ test("round-trips completion selection behavior through the editor settings draf
   assert.equal(editorSettingsDraftFromSettings({ ...DEFAULT_EDITOR_SETTINGS, ...patch }).selectFirstCompletionOnOpen, false);
 });
 
+test("round-trips the column header hover tooltip toggle through the editor settings draft", () => {
+  const base = editorSettingsDraftFromSettings(DEFAULT_EDITOR_SETTINGS);
+  assert.equal(base.showColumnHeaderTooltips, true);
+
+  const patch = editorSettingsPatchFromDraft({ ...base, showColumnHeaderTooltips: false }, base);
+
+  assert.deepEqual(patch, { showColumnHeaderTooltips: false });
+  assert.equal(editorSettingsDraftFromSettings({ ...DEFAULT_EDITOR_SETTINGS, ...patch }).showColumnHeaderTooltips, false);
+});
+
 test("round-trips the persisted CSV quote mode through the editor settings draft", () => {
   const base = editorSettingsDraftFromSettings(DEFAULT_EDITOR_SETTINGS);
   const patch = editorSettingsPatchFromDraft({ ...base, csvQuoteMode: "necessary" }, base);
diff --git a/packages/app-tests/settingsStore.test.ts b/packages/app-tests/settingsStore.test.ts
index dbc312a34d..27ce4311bd 100644
--- a/packages/app-tests/settingsStore.test.ts
+++ b/packages/app-tests/settingsStore.test.ts
@@ -629,6 +629,35 @@ test("keeps saved data grid header display settings", () => {
   assert.equal(settings.compactColumnHeaderActions, false);
 });
 
+test("defaults column header hover tooltips to on", () => {
+  // Existing installs have no persisted flag, so the grid must keep showing the
+  // header tooltip until the user opts out.
+  assert.equal(DEFAULT_EDITOR_SETTINGS.showColumnHeaderTooltips, true);
+  assert.equal(normalizeEditorSettings({}).showColumnHeaderTooltips, true);
+  assert.equal(normalizeEditorSettings({ showColumnHeaderTooltips: undefined } as any).showColumnHeaderTooltips, true);
+});
+
+test("keeps a disabled column header hover tooltip preference", () => {
+  assert.equal(normalizeEditorSettings({ showColumnHeaderTooltips: false } as any).showColumnHeaderTooltips, false);
+  assert.equal(normalizeEditorSettings({ showColumnHeaderTooltips: true } as any).showColumnHeaderTooltips, true);
+});
+
+test("updates the column header hover tooltip preference through the store", () => {
+  setActivePinia(createPinia());
+  const store = useSettingsStore();
+
+  assert.equal(store.editorSettings.showColumnHeaderTooltips, true);
+
+  store.updateEditorSettings({ showColumnHeaderTooltips: false });
+  assert.equal(store.editorSettings.showColumnHeaderTooltips, false);
+
+  store.updateEditorSettings({ showColumnTypesInHeader: false });
+  assert.equal(store.editorSettings.showColumnHeaderTooltips, false);
+
+  store.updateEditorSettings({ showColumnHeaderTooltips: true });
+  assert.equal(store.editorSettings.showColumnHeaderTooltips, true);
+});
+
 test("normalizes data grid render mode", () => {
   assert.equal(DEFAULT_EDITOR_SETTINGS.dataGridRenderMode, "canvas");
   assert.equal(normalizeEditorSettings({}).dataGridRenderMode, "canvas");