diff --git a/src/components/PaginatedTablePicker.test.tsx b/src/components/PaginatedTablePicker.test.tsx
index 20521ee6c..0a0269253 100644
--- a/src/components/PaginatedTablePicker.test.tsx
+++ b/src/components/PaginatedTablePicker.test.tsx
@@ -471,11 +471,12 @@ describe("paginated table picker contract", () => {
       );
 
       expect(headerIndex).toBeGreaterThanOrEqual(0);
-      expect(stringWidth(lines[headerIndex + 1]!)).toBe(width);
+      expect(stringWidth(lines[headerIndex + 1]!)).toBe(width - 1);
       expect(rowLines.every((line) => line !== undefined)).toBe(true);
       expect(new Set(rowLines.map((line) => lines.indexOf(line!))).size).toBe(suffixes.length);
-      expect(rowLines.every((line) => stringWidth(line!) <= width)).toBe(true);
+      expect(rowLines.every((line) => stringWidth(line!) <= width - 1)).toBe(true);
       expect(rowLines.every((line) => /runtime_\d-[A-Za-z0-9…]+\s+\d/.test(line!))).toBe(true);
+      expect(rowLines.every((line) => line!.includes("2026-07-19 01:02"))).toBe(true);
       if (width >= 80) {
         expect(rowLines.every((line, index) => line!.includes(suffixes[index]!))).toBe(true);
       }
diff --git a/src/components/ui/data-table/DataTable.test.tsx b/src/components/ui/data-table/DataTable.test.tsx
index b580ff783..c214b47b0 100644
--- a/src/components/ui/data-table/DataTable.test.tsx
+++ b/src/components/ui/data-table/DataTable.test.tsx
@@ -3,6 +3,7 @@ import { Box } from "ink";
 import { cleanup, render } from "ink-testing-library";
 import stringWidth from "string-width";
 import { DataTable, type DataTableColumn } from "./DataTable";
+import { TERMINAL_RIGHT_GUTTER_WIDTH } from "./columnWidths";
 
 afterEach(cleanup);
 
@@ -40,6 +41,16 @@ function renderTableAt(columnsWide: number) {
 }
 
 describe("DataTable layout", () => {
+  test("reserves a one-column gutter at the terminal's right edge", () => {
+    const terminalWidth = 60;
+    const divider = renderTableAt(terminalWidth)
+      .split("\n")
+      .find((line) => /^─+$/.test(line));
+
+    expect(divider).toBeDefined();
+    expect(stringWidth(divider!)).toBe(terminalWidth - TERMINAL_RIGHT_GUTTER_WIDTH);
+  });
+
   test("keeps the selection marker and each logical row on one line at 12 columns", () => {
     const lines = renderTableAt(12).split("\n");
     const rowLines = lines.filter(
diff --git a/src/components/ui/data-table/DataTable.tsx b/src/components/ui/data-table/DataTable.tsx
index fb79e962c..b33a9894f 100644
--- a/src/components/ui/data-table/DataTable.tsx
+++ b/src/components/ui/data-table/DataTable.tsx
@@ -9,6 +9,7 @@ import {
   computeColumnWidths,
   resolveBorderWidth,
   SELECTION_MARKER_WIDTH,
+  TERMINAL_RIGHT_GUTTER_WIDTH,
 } from "./columnWidths.js";
 import type { ColumnSizing } from "./columnWidths.js";
 
@@ -200,7 +201,8 @@ export function DataTable<T extends Record<string, unknown>>({
     left: borderLeft,
     right: borderRight,
   });
-  const computedWidths = computeColumnWidths(columns, terminalWidth, {
+  const tableWidth = Math.max(0, terminalWidth - TERMINAL_RIGHT_GUTTER_WIDTH);
+  const computedWidths = computeColumnWidths(columns, tableWidth, {
     selectable,
     borderWidth,
   });
diff --git a/src/components/ui/data-table/columnWidths.ts b/src/components/ui/data-table/columnWidths.ts
index 8e57b7a99..830d4e083 100644
--- a/src/components/ui/data-table/columnWidths.ts
+++ b/src/components/ui/data-table/columnWidths.ts
@@ -1,6 +1,7 @@
 export const COLUMN_GAP = 1;
 export const FLEX_MIN_WIDTH = 16;
 export const SELECTION_MARKER_WIDTH = 1;
+export const TERMINAL_RIGHT_GUTTER_WIDTH = 1;
 
 export type ColumnSizing =
   | { flex: true; width?: never; minWidth?: never }