diff --git a/apps/desktop/src/components/structure/TableStructureEditor.vue b/apps/desktop/src/components/structure/TableStructureEditor.vue
index 1a8e9c2c02..901d324ef6 100644
--- a/apps/desktop/src/components/structure/TableStructureEditor.vue
+++ b/apps/desktop/src/components/structure/TableStructureEditor.vue
@@ -76,6 +76,11 @@ import {
   generateUniqueIndexName,
   getColumnEditorControls,
   getDataTypeOptions,
+  POSTGRES_GEOMETRY_TYPES,
+  combinePostgresGeometryType,
+  isPostgresGeometryDataType,
+  postgresGeometrySridValue,
+  postgresGeometryTypeValue,
   getDataTypeLengthUnitOptions,
   getDefaultLengthForType,
   hasExistingColumnTypeChange,
@@ -2796,6 +2801,11 @@ function updateColumnDataTypeLength(column: EditableStructureColumn, value: stri
   syncDamengIdentityForDataType(column);
 }
 
+function updatePostgresGeometryColumn(column: EditableStructureColumn, geomType: string, srid: string) {
+  const baseType = dataTypeBaseInputValue(databaseType.value, column.dataType);
+  column.dataType = combinePostgresGeometryType(baseType, geomType, srid);
+}
+
 function updateColumnDataTypeLengthUnit(column: EditableStructureColumn, value: unknown) {
   const baseType = dataTypeBaseInputValue(databaseType.value, column.dataType);
   const unit = value === "__default" ? "" : String(value ?? "");
@@ -4453,6 +4463,35 @@ watch(
                           </div>
                         </PopoverContent>
                       </Popover>
+                      <div v-else-if="isPostgresGeometryDataType(databaseType, column.dataType)" class="flex min-w-0 flex-col gap-0.5">
+                        <div class="flex min-w-0 items-center gap-1" :title="t('structureEditor.geometrySridHint')">
+                          <SearchableSelect
+                            :model-value="postgresGeometryTypeValue(column.dataType)"
+                            :options="[...POSTGRES_GEOMETRY_TYPES]"
+                            :allow-custom="true"
+                            :clearable="true"
+                            :placeholder="t('structureEditor.geometryTypePlaceholder')"
+                            :search-placeholder="t('structureEditor.geometryTypePlaceholder')"
+                            :empty-text="t('structureEditor.noMatchingType')"
+                            :trigger-class="[structureMonoControlClass, 'min-w-0 flex-1']"
+                            :disabled="isColumnTypeDisabled(column)"
+                            @update:model-value="(v: string) => updatePostgresGeometryColumn(column, v, postgresGeometrySridValue(column.dataType))"
+                          />
+                          <Input
+                            :model-value="postgresGeometrySridValue(column.dataType)"
+                            :class="[structureMonoControlClass, 'w-20 shrink-0']"
+                            type="number"
+                            min="0"
+                            max="999999"
+                            :placeholder="t('structureEditor.sridPlaceholder')"
+                            :disabled="isColumnTypeDisabled(column)"
+                            @update:model-value="(v: string | number) => updatePostgresGeometryColumn(column, postgresGeometryTypeValue(column.dataType), String(v))"
+                          />
+                        </div>
+                        <p v-if="!postgresGeometryTypeValue(column.dataType) && postgresGeometrySridValue(column.dataType)" class="text-[length:var(--structure-font-size)] text-muted-foreground leading-tight">
+                          {{ t("structureEditor.geometryEmptyTypeHint") }}
+                        </p>
+                      </div>
                       <div v-else class="flex min-w-0 items-center gap-1">
                         <Input :model-value="dataTypeLengthInputValue(databaseType, column.dataType)" :class="[structureMonoControlClass, 'min-w-0 flex-1']" :disabled="isColumnLengthDisabled(column)" @update:model-value="updateColumnDataTypeLength(column, $event)" />
                         <Select v-if="columnLengthUnitOptions(column).length" :model-value="dataTypeLengthUnitValue(databaseType, column.dataType) || '__default'" :disabled="isColumnLengthUnitDisabled(column)" @update:model-value="updateColumnDataTypeLengthUnit(column, $event)">
diff --git a/apps/desktop/src/components/ui/searchable-select/SearchableSelect.vue b/apps/desktop/src/components/ui/searchable-select/SearchableSelect.vue
index 1158257d03..fff3faf393 100644
--- a/apps/desktop/src/components/ui/searchable-select/SearchableSelect.vue
+++ b/apps/desktop/src/components/ui/searchable-select/SearchableSelect.vue
@@ -2,6 +2,7 @@
 import { computed, nextTick, ref, watch } from "vue";
 import type { HTMLAttributes } from "vue";
 import { Check, ChevronDown, Search, X } from "@lucide/vue";
+import { useI18n } from "vue-i18n";
 import { Button } from "@/components/ui/button";
 import type { ButtonVariants } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -76,6 +77,7 @@ const helpPanel = ref<{ element?: HTMLElement }>();
 const highlightIndex = ref(-1);
 const activeHelpOption = ref<string>();
 const helpPanelOffsetTop = ref(0);
+const { t } = useI18n();
 
 const selectedLabel = computed(() => {
   if (!props.modelValue && !props.options.includes("")) return props.placeholder;
@@ -241,12 +243,29 @@ function handleKeydown(event: KeyboardEvent) {
 <template>
   <Popover v-model:open="open">
     <PopoverTrigger as-child>
-      <Button type="button" :variant="triggerVariant" :disabled="disabled" :title="selectedLabel" :class="cn(triggerBaseClass, triggerClass)">
+      <!--
+        Keep the trigger Button as the outermost element: triggerClass carries the layout
+        utilities consumers depend on (flex-1 / min-w-0 / max-w-* / w-full / h-*), and any
+        wrapper element would become the flex item and swallow them. The clearable overlay
+        therefore anchors to this button (relative) instead of a wrapper. The overlay is a
+        span (not the svg itself) because the Button base sets [&_svg]:pointer-events-none,
+        which is also why the old in-trigger @pointerdown.stop never fired; @click.stop
+        keeps Reka's bubble-phase trigger onClick (onOpenToggle) from opening the dropdown.
+      -->
+      <Button type="button" :variant="triggerVariant" :disabled="disabled" :title="selectedLabel" :class="cn('relative', triggerBaseClass, triggerClass)">
         <slot name="trigger-label" :value="modelValue" :label="selectedLabel" :loading="loading">
           <span class="truncate">{{ loading ? loadingText : selectedLabel }}</span>
         </slot>
-        <X v-if="clearable && !disabled && modelValue" :class="cn('shrink-0 opacity-60 hover:opacity-100', triggerIconClass)" @pointerdown.stop.prevent="emit('update:modelValue', '')" />
-        <ChevronDown v-else :class="cn('shrink-0 opacity-60', triggerIconClass)" />
+        <ChevronDown :class="cn('shrink-0 opacity-60', clearable && !disabled && modelValue && 'invisible', triggerIconClass)" />
+        <span
+          v-if="clearable && !disabled && modelValue"
+          class="absolute right-2 top-1/2 z-10 -translate-y-1/2 flex cursor-pointer items-center justify-center opacity-60 hover:opacity-100"
+          :aria-label="t('common.clear')"
+          :title="t('common.clear')"
+          @click.stop.prevent="emit('update:modelValue', '')"
+        >
+          <X :class="triggerIconClass" />
+        </span>
       </Button>
     </PopoverTrigger>
     <PopoverContent :align="SEARCHABLE_SELECT_HELP_PANEL_ALIGN" :class="cn('w-auto max-w-[calc(100vw-1rem)] border-0 bg-transparent p-0 shadow-none ring-0', contentClass)" :style="contentStyle">
diff --git a/apps/desktop/src/components/ui/searchable-select/__tests__/SearchableSelect.trigger.spec.ts b/apps/desktop/src/components/ui/searchable-select/__tests__/SearchableSelect.trigger.spec.ts
new file mode 100644
index 0000000000..598ed0c3d3
--- /dev/null
+++ b/apps/desktop/src/components/ui/searchable-select/__tests__/SearchableSelect.trigger.spec.ts
@@ -0,0 +1,70 @@
+// @vitest-environment happy-dom
+
+import { createApp, nextTick, type App } from "vue";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("vue-i18n", () => ({ useI18n: () => ({ t: (key: string) => key }) }));
+
+import { SearchableSelect } from "..";
+
+const mountedApps: App[] = [];
+
+function mountSelect(props: Record<string, unknown> = {}) {
+  const root = document.createElement("div");
+  document.body.append(root);
+  const emitted = { modelValue: [] as unknown[], open: [] as unknown[] };
+  const app = createApp(SearchableSelect, {
+    modelValue: "Point",
+    options: ["Point", "LineString"],
+    placeholder: "type",
+    searchPlaceholder: "search",
+    emptyText: "empty",
+    ...props,
+    "onUpdate:modelValue": (value: unknown) => emitted.modelValue.push(value),
+    "onUpdate:open": (value: unknown) => emitted.open.push(value),
+  });
+  mountedApps.push(app);
+  app.mount(root);
+  return { root, emitted };
+}
+
+afterEach(() => {
+  for (const app of mountedApps.splice(0)) app.unmount();
+  document.body.innerHTML = "";
+});
+
+describe("SearchableSelect trigger", () => {
+  it("renders the trigger button itself as the layout participant", () => {
+    const { root } = mountSelect({ triggerClass: "min-w-0 flex-1" });
+
+    const trigger = root.querySelector("button");
+
+    // No wrapper element may sit between the parent layout context and the
+    // trigger: triggerClass utilities (flex-1 / min-w-0 / max-w-*) must stay
+    // effective on the element the consumer lays out.
+    expect(trigger).not.toBeNull();
+    expect(root.firstElementChild).toBe(trigger);
+    expect(trigger?.className).toContain("flex-1");
+    expect(trigger?.className).toContain("min-w-0");
+  });
+
+  it("clears through the overlay without toggling the popover open", async () => {
+    const { root, emitted } = mountSelect({ clearable: true });
+
+    const clear = root.querySelector<HTMLElement>('[title="common.clear"]');
+    expect(clear).not.toBeNull();
+    expect(clear?.getAttribute("aria-label")).toBe("common.clear");
+
+    clear?.click();
+    await nextTick();
+
+    expect(emitted.modelValue).toEqual([""]);
+    expect(emitted.open).toEqual([]);
+  });
+
+  it("keeps the chevron space reserved while the clear overlay is shown", () => {
+    const { root } = mountSelect({ clearable: true });
+
+    expect(root.querySelector("button .invisible")).not.toBeNull();
+  });
+});
diff --git a/apps/desktop/src/i18n/locales/az.ts b/apps/desktop/src/i18n/locales/az.ts
index a9ca088cec..eb242b1cb5 100644
--- a/apps/desktop/src/i18n/locales/az.ts
+++ b/apps/desktop/src/i18n/locales/az.ts
@@ -4339,6 +4339,10 @@ export default withEnglishFallback({
     length: "Uzunluq",
     lengthUnit: "Uzunluq vahidi",
     unitPlaceholder: "Vahid",
+    geometryTypePlaceholder: "Həndəsi tipi seçin və ya daxil edin",
+    sridPlaceholder: "məs. 4326",
+    geometrySridHint: "Həndəsi tip və SRID təyin etmək spatial indeksləşdirmə və düzgün spatial sorğular üçün vacibdir.",
+    geometryEmptyTypeHint: "Həndəsi tipi boş buraxmaq GEOMETRY (istənilən alt tip) ilə bərabərdir; geometry(GEOMETRY, SRID) yaranır.",
     enumValues: "Sadalanan dəyərlər",
     enumValueCount: "{count} dəyər",
     addEnumValue: "Dəyər əlavə et",
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 18c541c0e1..4dca25410e 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -4335,6 +4335,10 @@ export default {
     length: "Length",
     lengthUnit: "Length unit",
     unitPlaceholder: "Unit",
+    geometryTypePlaceholder: "Select or type a geometry type",
+    sridPlaceholder: "e.g. 4326",
+    geometrySridHint: "Specify geometry type and SRID to enable spatial indexing and correct spatial queries.",
+    geometryEmptyTypeHint: "Empty geometry type equals GEOMETRY (any sub-type); dbx emits geometry(GEOMETRY, SRID).",
     enumValues: "Enum values",
     enumValueCount: "{count} values",
     addEnumValue: "Add value",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index e53c963c49..e40fd93ad3 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -4045,6 +4045,10 @@ export default withEnglishFallback({
     length: "Longitud",
     lengthUnit: "Unidad de longitud",
     unitPlaceholder: "Unidad",
+    geometryTypePlaceholder: "Selecciona o escribe un tipo de geometría",
+    sridPlaceholder: "ej. 4326",
+    geometrySridHint: "Especifica el tipo de geometría y el SRID para habilitar la indexación espacial y las consultas espaciales correctas.",
+    geometryEmptyTypeHint: "Dejar el tipo de geometría vacío equivale a GEOMETRY (cualquier subtipo); se genera geometry(GEOMETRY, SRID).",
     nullable: "Admite nulos",
     primaryKey: "Clave primaria",
     defaultValue: "Valor por defecto",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index e212a26765..995180a7d4 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -4043,6 +4043,10 @@ export default withEnglishFallback({
     length: "Lunghezza",
     lengthUnit: "Unità di lunghezza",
     unitPlaceholder: "Unità",
+    geometryTypePlaceholder: "Seleziona o digita un tipo di geometria",
+    sridPlaceholder: "es. 4326",
+    geometrySridHint: "Specifica il tipo di geometria e l'SRID per abilitare l'indicizzazione spaziale e le query spaziali corrette.",
+    geometryEmptyTypeHint: "Lasciare vuoto il tipo di geometria equivale a GEOMETRY (qualsiasi sottotipo); viene generato geometry(GEOMETRY, SRID).",
     nullable: "Nullabile",
     primaryKey: "Chiave Primaria",
     defaultValue: "Valore Predefinito",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index e974cabb5c..87ed47726c 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -4105,6 +4105,10 @@ export default withEnglishFallback({
     length: "長さ",
     lengthUnit: "長さの単位",
     unitPlaceholder: "単位",
+    geometryTypePlaceholder: "ジオメトリタイプを選択または入力",
+    sridPlaceholder: "例: 4326",
+    geometrySridHint: "空間インデックスの作成と正確な空間クエリには、ジオメトリタイプと SRID の指定が必要です。",
+    geometryEmptyTypeHint: "ジオメトリタイプを空にすると GEOMETRY（任意のサブタイプ）と同等になり、geometry(GEOMETRY, SRID) が生成されます。",
     nullable: "NULL許容",
     primaryKey: "主キー",
     defaultValue: "デフォルト",
diff --git a/apps/desktop/src/i18n/locales/ko.ts b/apps/desktop/src/i18n/locales/ko.ts
index c0eeeefd3c..a83f6bf002 100644
--- a/apps/desktop/src/i18n/locales/ko.ts
+++ b/apps/desktop/src/i18n/locales/ko.ts
@@ -4012,6 +4012,10 @@ export default withEnglishFallback({
     length: "길이",
     lengthUnit: "길이 단위",
     unitPlaceholder: "단위",
+    geometryTypePlaceholder: "지오메트리 유형을 선택하거나 입력",
+    sridPlaceholder: "예: 4326",
+    geometrySridHint: "공간 인덱싱과 정확한 공간 쿼리를 사용하려면 지오메트리 유형과 SRID를 지정하세요.",
+    geometryEmptyTypeHint: "지오메트리 유형을 비우면 GEOMETRY(임의 하위 유형)와 같으며, geometry(GEOMETRY, SRID)가 생성됩니다.",
     enumValues: "Enum 값",
     enumValueCount: "{count}개 값",
     addEnumValue: "값 추가",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index c6028962d0..fb66ab124c 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -4045,6 +4045,10 @@ export default withEnglishFallback({
     length: "Comprimento",
     lengthUnit: "Unidade de comprimento",
     unitPlaceholder: "Unidade",
+    geometryTypePlaceholder: "Selecione ou digite um tipo de geometria",
+    sridPlaceholder: "ex.: 4326",
+    geometrySridHint: "Especifique o tipo de geometria e o SRID para habilitar a indexação espacial e consultas espaciais corretas.",
+    geometryEmptyTypeHint: "Deixar o tipo de geometria vazio equivale a GEOMETRY (qualquer subtipo); gera geometry(GEOMETRY, SRID).",
     nullable: "Permite nulo",
     primaryKey: "Chave primária",
     defaultValue: "Padrão",
diff --git a/apps/desktop/src/i18n/locales/tr.ts b/apps/desktop/src/i18n/locales/tr.ts
index e6fab2d079..c9a8170e6a 100644
--- a/apps/desktop/src/i18n/locales/tr.ts
+++ b/apps/desktop/src/i18n/locales/tr.ts
@@ -4243,6 +4243,10 @@ export default withEnglishFallback({
     length: "Uzunluk",
     lengthUnit: "Uzunluk birimi",
     unitPlaceholder: "Birim",
+    geometryTypePlaceholder: "Bir geometri türü seçin veya yazın",
+    sridPlaceholder: "örn. 4326",
+    geometrySridHint: "Uzamsal dizinleme ve doğru uzamsal sorgular için geometri türü ve SRID belirtin.",
+    geometryEmptyTypeHint: "Geometri türünü boş bırakmak GEOMETRY (herhangi bir alt tür) ile eşdeğerdir; geometry(GEOMETRY, SRID) üretilir.",
     enumValues: "Enum değerleri",
     enumValueCount: "{count} değer",
     addEnumValue: "Değer ekle",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 6159c1fd5e..7082d589e9 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -4217,6 +4217,10 @@ export default withEnglishFallback({
     length: "长度",
     lengthUnit: "长度单位",
     unitPlaceholder: "单位",
+    geometryTypePlaceholder: "选择或输入几何类型",
+    sridPlaceholder: "如 4326",
+    geometrySridHint: "指定几何类型与 SRID 后方可创建空间索引并正确执行空间查询。",
+    geometryEmptyTypeHint: "几何类型留空时等价于 GEOMETRY（任意子类型），将生成 geometry(GEOMETRY, SRID)。",
     enumValues: "枚举值",
     enumValueCount: "{count} 个值",
     addEnumValue: "添加值",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index 485e328fa7..951e0fe4ff 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -3787,6 +3787,10 @@ export default withEnglishFallback({
     length: "長度",
     lengthUnit: "長度單位",
     unitPlaceholder: "單位",
+    geometryTypePlaceholder: "選擇或輸入幾何類型",
+    sridPlaceholder: "如 4326",
+    geometrySridHint: "指定幾何類型與 SRID 後方可建立空間索引並正確執行空間查詢。",
+    geometryEmptyTypeHint: "幾何類型留空時等價於 GEOMETRY（任意子類型），將生成 geometry(GEOMETRY, SRID)。",
     typePlaceholder: "選擇或輸入……",
     noMatchingType: "沒有相符類型",
     nullable: "可為空",
diff --git a/apps/desktop/src/lib/__tests__/table/tableStructureEditorState.geometry.spec.ts b/apps/desktop/src/lib/__tests__/table/tableStructureEditorState.geometry.spec.ts
new file mode 100644
index 0000000000..c80ed8781b
--- /dev/null
+++ b/apps/desktop/src/lib/__tests__/table/tableStructureEditorState.geometry.spec.ts
@@ -0,0 +1,98 @@
+import { describe, expect, it } from "vitest";
+
+import { combinePostgresGeometryType, isPostgresGeometryDataType, POSTGRES_GEOMETRY_TYPES, postgresGeometrySridValue, postgresGeometryTypeValue } from "@/lib/table/tableStructureEditorState";
+
+describe("postgres geometry column typmod helpers", () => {
+  describe("combinePostgresGeometryType", () => {
+    it("returns bare type when both sub-type and SRID are empty", () => {
+      expect(combinePostgresGeometryType("geometry", "", "")).toBe("geometry");
+    });
+
+    it("emits geometry(Point) for sub-type only", () => {
+      expect(combinePostgresGeometryType("geometry", "Point", "")).toBe("geometry(Point)");
+    });
+
+    it("emits geometry(GEOMETRY,4326) for SRID only (geometry(,4326) and geometry(4326) are rejected by PostGIS)", () => {
+      expect(combinePostgresGeometryType("geometry", "", "4326")).toBe("geometry(GEOMETRY,4326)");
+    });
+
+    it("emits geometry(Point,4326) for both", () => {
+      expect(combinePostgresGeometryType("geometry", "Point", "4326")).toBe("geometry(Point,4326)");
+    });
+
+    it("trims whitespace in inputs", () => {
+      expect(combinePostgresGeometryType("  geography  ", "  Polygon  ", "  3857  ")).toBe("geography(Polygon,3857)");
+    });
+
+    it("emits geography(GEOMETRY,4326) for geography SRID only (verified against PostGIS)", () => {
+      expect(combinePostgresGeometryType("geography", "", "4326")).toBe("geography(GEOMETRY,4326)");
+    });
+
+    it("returns empty string when base type is empty", () => {
+      expect(combinePostgresGeometryType("", "Point", "4326")).toBe("");
+    });
+  });
+
+  describe("postgresGeometryTypeValue / postgresGeometrySridValue", () => {
+    it("parses geometry(Point,4326)", () => {
+      expect(postgresGeometryTypeValue("geometry(Point,4326)")).toBe("Point");
+      expect(postgresGeometrySridValue("geometry(Point,4326)")).toBe("4326");
+    });
+
+    it("parses geography(Polygon,3857)", () => {
+      expect(postgresGeometryTypeValue("geography(Polygon,3857)")).toBe("Polygon");
+      expect(postgresGeometrySridValue("geography(Polygon,3857)")).toBe("3857");
+    });
+
+    it("parses bare geometry with no typmod", () => {
+      expect(postgresGeometryTypeValue("geometry")).toBe("");
+      expect(postgresGeometrySridValue("geometry")).toBe("");
+    });
+
+    it("parses whitespace variant geometry( Point , 4326 )", () => {
+      expect(postgresGeometryTypeValue("geometry( Point , 4326 )")).toBe("Point");
+      expect(postgresGeometrySridValue("geometry( Point , 4326 )")).toBe("4326");
+    });
+
+    it("parses sub-type-only geometry(Point)", () => {
+      expect(postgresGeometryTypeValue("geometry(Point)")).toBe("Point");
+      expect(postgresGeometrySridValue("geometry(Point)")).toBe("");
+    });
+
+    it("parses geometry(GEOMETRY,4326) as blank (GEOMETRY = any sub-type, normalized to empty)", () => {
+      expect(postgresGeometryTypeValue("geometry(GEOMETRY,4326)")).toBe("");
+      expect(postgresGeometrySridValue("geometry(GEOMETRY,4326)")).toBe("4326");
+    });
+  });
+
+  describe("isPostgresGeometryDataType", () => {
+    it("returns true for postgres + geometry", () => {
+      expect(isPostgresGeometryDataType("postgres", "geometry(Point,4326)")).toBe(true);
+    });
+
+    it("returns true for postgres + bare geography", () => {
+      expect(isPostgresGeometryDataType("postgres", "geography")).toBe(true);
+    });
+
+    it("returns true for gaussdb (Postgres family)", () => {
+      expect(isPostgresGeometryDataType("gaussdb", "geometry(Point,4326)")).toBe(true);
+    });
+
+    it("returns false for mysql even with a geometry type string", () => {
+      expect(isPostgresGeometryDataType("mysql", "geometry")).toBe(false);
+    });
+
+    it("returns false for postgres non-spatial types", () => {
+      expect(isPostgresGeometryDataType("postgres", "varchar(255)")).toBe(false);
+    });
+  });
+
+  it("POSTGRES_GEOMETRY_TYPES includes the OGC simple-feature sub-types", () => {
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("Point");
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("LineString");
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("Polygon");
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("MultiPoint");
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("MultiPolygon");
+    expect(POSTGRES_GEOMETRY_TYPES).toContain("GeometryCollection");
+  });
+});
diff --git a/apps/desktop/src/lib/table/tableStructureEditorState.ts b/apps/desktop/src/lib/table/tableStructureEditorState.ts
index c9d2b45807..b3f5484ef3 100644
--- a/apps/desktop/src/lib/table/tableStructureEditorState.ts
+++ b/apps/desktop/src/lib/table/tableStructureEditorState.ts
@@ -1470,3 +1470,63 @@ export function buildStructureTargetLabel(connectionName: string | undefined, da
   if (tableName) parts.push(tableName);
   return parts.filter(Boolean).join(" / ");
 }
+
+/** PostGIS `geometry(...)`/`geography(...)` typmod accepts these geometry sub-type
+ * names (case-insensitive). An empty value means "no sub-type constraint". */
+export const POSTGRES_GEOMETRY_TYPES: readonly string[] = ["Point", "LineString", "Polygon", "MultiPoint", "MultiLineString", "MultiPolygon", "GeometryCollection", "CircularString", "CompoundCurve", "CurvePolygon", "MultiCurve", "MultiSurface", "PolyhedralSurface", "TIN", "Triangle"];
+
+const POSTGRES_SPATIAL_TYPES = new Set(["geometry", "geography"]);
+const POSTGRES_LIKE_DATABASES = new Set<DatabaseType | undefined>(["postgres", "gaussdb", "kwdb", "opengauss", "highgo", "uxdb", "vastbase", "kingbase"]);
+
+/** Whether a column is a PostGIS `geometry`/`geography` on a PostgreSQL-family
+ * database — the case where the structure editor shows dedicated geometry-type
+ * and SRID controls instead of the generic length input. */
+export function isPostgresGeometryDataType(dbType: DatabaseType | undefined, rawDataType: string): boolean {
+  if (!POSTGRES_LIKE_DATABASES.has(dbType)) return false;
+  const { baseType } = splitDataType(rawDataType);
+  return POSTGRES_SPATIAL_TYPES.has(baseType.trim().toLowerCase());
+}
+
+/** Geometry sub-type parsed from `geometry(Point,4326)` → `"Point"`. Returns empty
+ * for bare `geometry` (no typmod) and for `geometry(GEOMETRY,srid)` — the latter is
+ * PostGIS's storage form of "any sub-type" (what a blank sub-type + SRID compiles to),
+ * normalized back to empty to match the user-facing "leave blank" intent. This keeps
+ * the clear (X) button visually emptying the field instead of showing "GEOMETRY".
+ * `geometry(,4326)` is invalid and never produced. */
+export function postgresGeometryTypeValue(rawDataType: string): string {
+  const { params } = splitDataType(rawDataType);
+  const geomType = splitPostgresGeometryParams(params).geomType;
+  return geomType.toLowerCase() === "geometry" ? "" : geomType;
+}
+
+/** SRID parsed from `geometry(Point,4326)` → `"4326"`. Empty when unspecified. */
+export function postgresGeometrySridValue(rawDataType: string): string {
+  const { params } = splitDataType(rawDataType);
+  return splitPostgresGeometryParams(params).srid;
+}
+
+function splitPostgresGeometryParams(params: string): { geomType: string; srid: string } {
+  const trimmed = params.trim();
+  if (!trimmed) return { geomType: "", srid: "" };
+  const commaIndex = trimmed.indexOf(",");
+  if (commaIndex === -1) return { geomType: trimmed, srid: "" };
+  return { geomType: trimmed.slice(0, commaIndex).trim(), srid: trimmed.slice(commaIndex + 1).trim() };
+}
+
+/** Reassemble a PostGIS spatial type string from its parts.
+ *
+ * - both empty → bare `geometry` (no typmod)
+ * - sub-type only → `geometry(Point)`
+ * - SRID only   → `geometry(GEOMETRY,4326)` (PostGIS rejects `geometry(,4326)` (syntax error at `,`) and `geometry(4326)` ("Invalid geometry type modifier"); `GEOMETRY` is a valid sub-type token meaning any geometry, so it is the canonical way to constrain SRID only)
+ * - both        → `geometry(Point,4326)`
+ */
+export function combinePostgresGeometryType(baseType: string, geomType: string, srid: string): string {
+  const type = baseType.trim();
+  const geom = geomType.trim();
+  const sridValue = srid.trim();
+  if (!type) return "";
+  if (!geom && !sridValue) return type;
+  if (!geom) return `${type}(GEOMETRY,${sridValue})`; // PostGIS rejects geometry(,4326) and geometry(4326); GEOMETRY = any sub-type, constrains SRID only
+  if (!sridValue) return `${type}(${geom})`;
+  return `${type}(${geom},${sridValue})`;
+}