diff --git a/oxibadge/src-tauri/capabilities/default.json b/oxibadge/src-tauri/capabilities/default.json
index b9ec4c1..194c1d3 100644
--- a/oxibadge/src-tauri/capabilities/default.json
+++ b/oxibadge/src-tauri/capabilities/default.json
@@ -4,6 +4,7 @@
   "description": "Capability for the main window",
   "windows": ["main"],
   "permissions": [
-    "core:default"
+    "core:default",
+    "core:window:allow-destroy"
   ]
 }
diff --git a/oxibadge/src/lib/components/review/ActionButton.svelte b/oxibadge/src/lib/components/ActionButton.svelte
similarity index 100%
rename from oxibadge/src/lib/components/review/ActionButton.svelte
rename to oxibadge/src/lib/components/ActionButton.svelte
diff --git a/oxibadge/src/lib/components/ConfirmDialog.svelte b/oxibadge/src/lib/components/ConfirmDialog.svelte
new file mode 100644
index 0000000..5ef6d49
--- /dev/null
+++ b/oxibadge/src/lib/components/ConfirmDialog.svelte
@@ -0,0 +1,83 @@
+<script lang="ts">
+  import ModalFrame from './ModalFrame.svelte';
+  import ActionButton from './ActionButton.svelte';
+
+  let {
+    fixed = false,
+    title,
+    message,
+    confirmLabel,
+    cancelLabel,
+    onconfirm,
+    oncancel
+  }: {
+    /** See `ModalFrame`'s `fixed` prop. */
+    fixed?: boolean;
+    title: string;
+    message: string;
+    confirmLabel: string;
+    cancelLabel: string;
+    onconfirm: () => void;
+    oncancel: () => void;
+  } = $props();
+
+  // Unique per instance, so two ConfirmDialogs never clash if ever shown
+  // at once (e.g. this one plus the app-wide "quit with unsaved changes" one).
+  const uid = $props.id();
+</script>
+
+<ModalFrame
+  {fixed}
+  titleId="{uid}-title"
+  descId="{uid}-desc"
+  closeAriaLabel={cancelLabel}
+  onclose={oncancel}
+>
+  {#snippet icon()}
+    <svg width="22" height="22" viewBox="0 0 24 24" aria-hidden="true"
+      ><path d="M10.3 3.9L2.4 17.5A2 2 0 0 0 4.1 20.5h15.8a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z" /><path
+        d="M12 9.5v4M12 17h.01"
+      /></svg
+    >
+  {/snippet}
+  <div class="modal-text">
+    <h2 id="{uid}-title">{title}</h2>
+    <p id="{uid}-desc">{message}</p>
+  </div>
+  <div class="modal-actions">
+    <ActionButton onclick={oncancel}>{cancelLabel}</ActionButton>
+    <ActionButton primary onclick={onconfirm}>{confirmLabel}</ActionButton>
+  </div>
+</ModalFrame>
+
+<style>
+  .modal-text {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+  }
+
+  .modal-text h2 {
+    margin: 0;
+    font-family: var(--ox-font-display);
+    font-weight: 700;
+    font-size: 22px;
+    line-height: 1.2;
+    letter-spacing: -0.02em;
+    color: #ffffff;
+  }
+
+  .modal-text p {
+    margin: 0;
+    font-size: 14px;
+    line-height: 1.5;
+    color: #a3a3a3;
+  }
+
+  .modal-actions {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: flex-end;
+    gap: 10px;
+  }
+</style>
diff --git a/oxibadge/src/lib/components/IconButton.svelte b/oxibadge/src/lib/components/IconButton.svelte
index 33b9f6b..19916ad 100644
--- a/oxibadge/src/lib/components/IconButton.svelte
+++ b/oxibadge/src/lib/components/IconButton.svelte
@@ -5,6 +5,7 @@
     size = 'sm',
     accent = false,
     danger = false,
+    dangerFilled = false,
     title,
     ariaLabel,
     onclick,
@@ -12,7 +13,10 @@
   }: {
     size?: 'sm' | 'lg';
     accent?: boolean;
+    /** Subtle red tint on hover only — for a destructive icon among others, e.g. in a list row. */
     danger?: boolean;
+    /** Permanent red box, like `accent` but red — for a standalone destructive action. */
+    dangerFilled?: boolean;
     title?: string;
     ariaLabel: string;
     onclick: () => void;
@@ -26,6 +30,7 @@
   class:lg={size === 'lg'}
   class:accent
   class:danger
+  class:danger-filled={dangerFilled}
   {title}
   aria-label={ariaLabel}
   {onclick}
@@ -81,4 +86,18 @@
     background: rgba(229, 72, 77, 0.14);
     color: #ff8a8f;
   }
+
+  .icon-btn.danger-filled {
+    background: rgba(229, 72, 77, 0.14);
+    color: #ff6b74;
+  }
+
+  .icon-btn.danger-filled:hover {
+    background: rgba(229, 72, 77, 0.22);
+    color: #ff8a8f;
+  }
+
+  .icon-btn.danger-filled:focus-visible {
+    outline-color: #e5484d;
+  }
 </style>
diff --git a/oxibadge/src/lib/components/ModalFrame.svelte b/oxibadge/src/lib/components/ModalFrame.svelte
new file mode 100644
index 0000000..7066153
--- /dev/null
+++ b/oxibadge/src/lib/components/ModalFrame.svelte
@@ -0,0 +1,86 @@
+<script lang="ts">
+  import type { Snippet } from 'svelte';
+
+  let {
+    fixed = false,
+    titleId,
+    descId,
+    closeAriaLabel,
+    onclose,
+    icon,
+    children
+  }: {
+    /** Use for a modal that must sit above the whole app (e.g. shown from
+     * outside the screen it concerns), instead of within the nearest
+     * positioned ancestor. */
+    fixed?: boolean;
+    titleId: string;
+    descId?: string;
+    closeAriaLabel: string;
+    onclose: () => void;
+    icon?: Snippet;
+    children: Snippet;
+  } = $props();
+</script>
+
+<div class="modal-wrap" class:fixed>
+  <button type="button" class="modal-backdrop" aria-label={closeAriaLabel} onclick={onclose}></button>
+  <div class="modal" role="alertdialog" aria-modal="true" aria-labelledby={titleId} aria-describedby={descId}>
+    {#if icon}
+      <div class="modal-icon">{@render icon()}</div>
+    {/if}
+    {@render children()}
+  </div>
+</div>
+
+<style>
+  .modal-wrap {
+    position: absolute;
+    inset: 0;
+    z-index: 40;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 24px;
+    box-sizing: border-box;
+  }
+
+  .modal-wrap.fixed {
+    position: fixed;
+    z-index: 100;
+  }
+
+  .modal-backdrop {
+    all: unset;
+    position: absolute;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.6);
+    cursor: default;
+  }
+
+  .modal {
+    position: relative;
+    width: 100%;
+    max-width: 440px;
+    box-sizing: border-box;
+    padding: 24px;
+    background: #1a1a1a;
+    border: 1px solid #333333;
+    border-radius: 18px;
+    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
+    display: flex;
+    flex-direction: column;
+    gap: 18px;
+  }
+
+  .modal-icon {
+    width: 44px;
+    height: 44px;
+    border-radius: 12px;
+    background: rgba(229, 72, 77, 0.14);
+    color: #ff6b74;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+</style>
diff --git a/oxibadge/src/lib/components/TimesheetReview.svelte b/oxibadge/src/lib/components/TimesheetReview.svelte
index 158f2a6..6acb283 100644
--- a/oxibadge/src/lib/components/TimesheetReview.svelte
+++ b/oxibadge/src/lib/components/TimesheetReview.svelte
@@ -23,7 +23,8 @@
   import TimesheetTable from './review/TimesheetTable.svelte';
   import ExportModal from './review/ExportModal.svelte';
   import Toast from './review/Toast.svelte';
-  import ActionButton from './review/ActionButton.svelte';
+  import ActionButton from './ActionButton.svelte';
+  import ConfirmDialog from './ConfirmDialog.svelte';
 
   let {
     year,
@@ -32,7 +33,8 @@
     shift,
     onexport,
     onrename,
-    onback
+    onback,
+    ondirtychange
   }: {
     year: number;
     month: number;
@@ -41,6 +43,8 @@
     onexport?: (p: { scope: 'all' | 'one'; year: number; month: number; employees: Employee[] }) => void;
     onrename?: (id: Employee['id'], name: string) => void;
     onback?: () => void;
+    /** Called whenever there are (or stop being) edits not yet exported. */
+    ondirtychange?: (dirty: boolean) => void;
   } = $props();
 
   // Working copies: the component never mutates the props. Loading another
@@ -52,6 +56,11 @@
   let names = $state<string[]>(untrack(() => employees.map((e) => e.name)));
   /** "employee-day-slot-index" -> time produced by rounding */
   let rounded = $state<Record<string, string>>({});
+  let hasUnexportedChanges = $state(false);
+
+  $effect(() => {
+    ondirtychange?.(hasUnexportedChanges);
+  });
 
   // ---- UI state ----
   let emp = $state(0);
@@ -61,6 +70,7 @@
   let draft = $state('');
   let menuOpen = $state(false);
   let confirmScope = $state<'all' | 'one' | null>(null);
+  let confirmingUndoAll = $state(false);
   let toast = $state('');
   let toastTimer: ReturnType<typeof setTimeout> | undefined;
 
@@ -92,6 +102,7 @@
       cell[ii] = next;
       if (input.value !== next) input.value = next; // keep the field in sync even if the state doesn't change
     }
+    hasUnexportedChanges = true;
   }
 
   /** Redistributes the day's punches into E1, U1, E2, U2 based on the expected shifts. */
@@ -100,6 +111,7 @@
       const times = values[emp][di].flat().filter((x) => x !== '');
       values[emp][di] = assignToShifts(times, shift);
     }
+    hasUnexportedChanges = true;
   }
 
   function addLunch(dis: number[]) {
@@ -107,6 +119,7 @@
       const span = lunchSpan(values[emp][di], shift);
       if (span) values[emp][di] = [[span[0]], [shift.out1], [shift.in2], [span[1]]];
     }
+    hasUnexportedChanges = true;
   }
 
   function roundDaysOf(ei: number, dis: number[]) {
@@ -119,6 +132,24 @@
         })
       ) as Day;
     }
+    hasUnexportedChanges = true;
+  }
+
+  /** Reverts one day back to what the time clock originally reported. */
+  function undoDay(di: number) {
+    values[emp][di] = orig[emp][di].map((c) => [...c]) as Day;
+    hasUnexportedChanges = true;
+  }
+
+  function requestUndoAll() {
+    confirmingUndoAll = true;
+  }
+
+  /** Reverts every day of the current employee back to the time clock's original data. */
+  function confirmUndoAll() {
+    confirmingUndoAll = false;
+    values[emp] = orig[emp].map((day) => day.map((c) => [...c]) as Day);
+    hasUnexportedChanges = true;
   }
 
   // ---- Name ----
@@ -150,6 +181,7 @@
     });
     confirmScope = null;
     menuOpen = false;
+    hasUnexportedChanges = false;
     toast = $_('review.export_done', {
       values: { who: scope === 'all' ? $_('review.everyone') : names[emp] }
     });
@@ -212,6 +244,7 @@
   function onKey(e: KeyboardEvent) {
     if (e.key !== 'Escape') return;
     if (confirmScope) confirmScope = null;
+    else if (confirmingUndoAll) confirmingUndoAll = false;
     else if (menuOpen) menuOpen = false;
     else if (editingName) editingName = false;
   }
@@ -238,6 +271,17 @@
     />
   {/if}
 
+  {#if confirmingUndoAll}
+    <ConfirmDialog
+      title={$_('review.undo_all_confirm_title')}
+      message={$_('review.undo_all_confirm_message')}
+      confirmLabel={$_('review.undo_all_confirm')}
+      cancelLabel={$_('review.cancel')}
+      onconfirm={confirmUndoAll}
+      oncancel={() => (confirmingUndoAll = false)}
+    />
+  {/if}
+
   <Toast message={toast} />
 
   {#if names.length === 0}
@@ -293,6 +337,7 @@
           onfixall={() => fixDays(cur.stackedDays)}
           onaddlunchall={() => addLunch(cur.lunchDays)}
           onroundall={() => roundDaysOf(emp, cur.roundDays)}
+          onundoall={requestUndoAll}
           bind:onlyIssues
         />
 
@@ -305,6 +350,7 @@
           onfixday={(di) => fixDays([di])}
           onaddlunch={(di) => addLunch([di])}
           onroundday={(di) => roundDaysOf(emp, [di])}
+          onundoday={undoDay}
         />
       </main>
     </div>
diff --git a/oxibadge/src/lib/components/review/EmployeeHeader.svelte b/oxibadge/src/lib/components/review/EmployeeHeader.svelte
index 687274b..f411de5 100644
--- a/oxibadge/src/lib/components/review/EmployeeHeader.svelte
+++ b/oxibadge/src/lib/components/review/EmployeeHeader.svelte
@@ -23,6 +23,7 @@
     onfixall,
     onaddlunchall,
     onroundall,
+    onundoall,
     onlyIssues = $bindable(false)
   }: {
     name: string;
@@ -41,6 +42,7 @@
     onfixall: () => void;
     onaddlunchall: () => void;
     onroundall: () => void;
+    onundoall: () => void;
     onlyIssues?: boolean;
   } = $props();
 
@@ -150,6 +152,21 @@
         >{$_('review.to_check_cap')}</button
       >
     </div>
+    {#if edits}
+      <IconButton
+        size="lg"
+        dangerFilled
+        ariaLabel={$_('review.undo_all')}
+        title={$_('review.undo_all_title')}
+        onclick={onundoall}
+      >
+        {#snippet icon()}
+          <svg width="18" height="18" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
+            ><path d="M9 14l-5-5 5-5" /><path d="M20 20v-7a4 4 0 0 0-4-4H4" /></svg
+          >
+        {/snippet}
+      </IconButton>
+    {/if}
   </div>
 </div>
 
diff --git a/oxibadge/src/lib/components/review/ExportModal.svelte b/oxibadge/src/lib/components/review/ExportModal.svelte
index c340011..a321bc6 100644
--- a/oxibadge/src/lib/components/review/ExportModal.svelte
+++ b/oxibadge/src/lib/components/review/ExportModal.svelte
@@ -1,8 +1,9 @@
 <script lang="ts">
   import { _ } from 'svelte-i18n';
   import type { Shifts } from '$lib/shifts';
+  import ModalFrame from '../ModalFrame.svelte';
   import FixButton from './FixButton.svelte';
-  import ActionButton from './ActionButton.svelte';
+  import ActionButton from '../ActionButton.svelte';
 
   let {
     title,
@@ -25,108 +26,64 @@
   } = $props();
 </script>
 
-<div class="modal-wrap">
-  <button type="button" class="modal-backdrop" aria-label={$_('review.cancel_export_aria')} onclick={onclose}
-  ></button>
-  <div class="modal" role="alertdialog" aria-modal="true" aria-labelledby="ox-exp-title" aria-describedby="ox-exp-desc">
-    <div class="modal-icon">
-      <svg width="22" height="22" viewBox="0 0 24 24" aria-hidden="true"
-        ><path d="M10.3 3.9L2.4 17.5A2 2 0 0 0 4.1 20.5h15.8a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z" /><path
-          d="M12 9.5v4M12 17h.01"
-        /></svg
-      >
-    </div>
-    <div class="modal-text">
-      <h2 id="ox-exp-title">{title}</h2>
-      <p id="ox-exp-desc">
-        {#if scopeIssues}
-          {$_('review.export_warning_issues')}
-        {:else}
-          {$_('review.export_warning_unrounded', { values: { step: shift.round_step_min } })}
-        {/if}
-      </p>
-    </div>
-    <div class="modal-list scroll">
-      {#each items as it (it.key)}
-        <button type="button" class="menu-item row-item" onclick={it.go}>
-          <span class="mi-label">{it.label}</span>
-          <span class="mi-detail" class:red={it.red} class:blue={!it.red}>{it.detail}</span>
-          <svg width="14" height="14" viewBox="0 0 24 24" aria-hidden="true" class="mi-chev"
-            ><path d="M9 6l6 6-6 6" /></svg
-          >
-        </button>
-      {/each}
-    </div>
-    <div class="modal-actions">
-      <ActionButton onclick={onclose}>{$_('review.back_to_review')}</ActionButton>
-      {#if scopeIssues === 0 && scopeInfos > 0}
-        <FixButton size="tall" blue onclick={onroundandexport}>
-          {#snippet icon()}
-            <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
-              ><circle cx="12" cy="13" r="8" /><path d="M12 9v4l2.5 2.5M10 2h4" /></svg
-            >
-          {/snippet}
-          {$_('review.round_and_export')}
-        </FixButton>
+<ModalFrame
+  titleId="ox-exp-title"
+  descId="ox-exp-desc"
+  closeAriaLabel={$_('review.cancel_export_aria')}
+  {onclose}
+>
+  {#snippet icon()}
+    <svg width="22" height="22" viewBox="0 0 24 24" aria-hidden="true"
+      ><path d="M10.3 3.9L2.4 17.5A2 2 0 0 0 4.1 20.5h15.8a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z" /><path
+        d="M12 9.5v4M12 17h.01"
+      /></svg
+    >
+  {/snippet}
+  <div class="modal-text">
+    <h2 id="ox-exp-title">{title}</h2>
+    <p id="ox-exp-desc">
+      {#if scopeIssues}
+        {$_('review.export_warning_issues')}
+      {:else}
+        {$_('review.export_warning_unrounded', { values: { step: shift.round_step_min } })}
       {/if}
-      <ActionButton primary onclick={onexportanyway}>
+    </p>
+  </div>
+  <div class="modal-list scroll">
+    {#each items as it (it.key)}
+      <button type="button" class="menu-item row-item" onclick={it.go}>
+        <span class="mi-label">{it.label}</span>
+        <span class="mi-detail" class:red={it.red} class:blue={!it.red}>{it.detail}</span>
+        <svg width="14" height="14" viewBox="0 0 24 24" aria-hidden="true" class="mi-chev"
+          ><path d="M9 6l6 6-6 6" /></svg
+        >
+      </button>
+    {/each}
+  </div>
+  <div class="modal-actions">
+    <ActionButton onclick={onclose}>{$_('review.back_to_review')}</ActionButton>
+    {#if scopeIssues === 0 && scopeInfos > 0}
+      <FixButton size="tall" blue onclick={onroundandexport}>
         {#snippet icon()}
-          <svg width="18" height="18" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
-            ><path d="M12 4v11M7 10l5 5 5-5M5 20h14" /></svg
+          <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
+            ><circle cx="12" cy="13" r="8" /><path d="M12 9v4l2.5 2.5M10 2h4" /></svg
           >
         {/snippet}
-        {$_('review.export_anyway')}
-      </ActionButton>
-    </div>
+        {$_('review.round_and_export')}
+      </FixButton>
+    {/if}
+    <ActionButton primary onclick={onexportanyway}>
+      {#snippet icon()}
+        <svg width="18" height="18" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
+          ><path d="M12 4v11M7 10l5 5 5-5M5 20h14" /></svg
+        >
+      {/snippet}
+      {$_('review.export_anyway')}
+    </ActionButton>
   </div>
-</div>
+</ModalFrame>
 
 <style>
-  .modal-wrap {
-    position: absolute;
-    inset: 0;
-    z-index: 40;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    padding: 24px;
-    box-sizing: border-box;
-  }
-
-  .modal-backdrop {
-    all: unset;
-    position: absolute;
-    inset: 0;
-    background: rgba(0, 0, 0, 0.6);
-    cursor: default;
-  }
-
-  .modal {
-    position: relative;
-    width: 100%;
-    max-width: 440px;
-    box-sizing: border-box;
-    padding: 24px;
-    background: #1a1a1a;
-    border: 1px solid #333333;
-    border-radius: 18px;
-    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
-    display: flex;
-    flex-direction: column;
-    gap: 18px;
-  }
-
-  .modal-icon {
-    width: 44px;
-    height: 44px;
-    border-radius: 12px;
-    background: rgba(229, 72, 77, 0.14);
-    color: #ff6b74;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-  }
-
   .modal-text {
     display: flex;
     flex-direction: column;
diff --git a/oxibadge/src/lib/components/review/TimesheetTable.svelte b/oxibadge/src/lib/components/review/TimesheetTable.svelte
index edbe155..811474d 100644
--- a/oxibadge/src/lib/components/review/TimesheetTable.svelte
+++ b/oxibadge/src/lib/components/review/TimesheetTable.svelte
@@ -12,7 +12,8 @@
     oncellinput,
     onfixday,
     onaddlunch,
-    onroundday
+    onroundday,
+    onundoday
   }: {
     rows: Row[];
     rounded: Record<string, string>;
@@ -22,6 +23,7 @@
     onfixday: (di: number) => void;
     onaddlunch: (di: number) => void;
     onroundday: (di: number) => void;
+    onundoday: (di: number) => void;
   } = $props();
 </script>
 
@@ -85,6 +87,19 @@
 
           <td class="note {note.kind}">
             <span class="note-in">
+              {#if r.rowEdits > 0}
+                <button
+                  type="button"
+                  class="undo-btn"
+                  aria-label={$_('review.undo_day_aria', { values: { label } })}
+                  title={$_('review.undo_short')}
+                  onclick={() => onundoday(r.di)}
+                >
+                  <svg width="14" height="14" viewBox="0 0 24 24" aria-hidden="true" style="stroke-width: 2"
+                    ><path d="M9 14l-5-5 5-5" /><path d="M20 20v-7a4 4 0 0 0-4-4H4" /></svg
+                  >
+                </button>
+              {/if}
               {#if note.kind === 'issue'}
                 <svg width="14" height="14" viewBox="0 0 24 24" aria-hidden="true"
                   ><circle cx="12" cy="12" r="9" /><path d="M12 7.5v5.5M12 16.5h.01" /></svg
@@ -377,6 +392,33 @@
     gap: 8px;
   }
 
+  .undo-btn {
+    all: unset;
+    box-sizing: border-box;
+    width: 22px;
+    height: 22px;
+    flex: none;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    border-radius: 6px;
+    color: #6e6e6e;
+    cursor: pointer;
+    transition:
+      background 0.15s,
+      color 0.15s;
+  }
+
+  .undo-btn:hover {
+    background: #262626;
+    color: #e6e6e6;
+  }
+
+  .undo-btn:focus-visible {
+    outline: 2px solid var(--ox-accent);
+    outline-offset: 1px;
+  }
+
   .empty {
     padding: 48px 24px;
     display: flex;
diff --git a/oxibadge/src/lib/components/settings/ReaderCard.svelte b/oxibadge/src/lib/components/settings/ReaderCard.svelte
index dedd187..3050191 100644
--- a/oxibadge/src/lib/components/settings/ReaderCard.svelte
+++ b/oxibadge/src/lib/components/settings/ReaderCard.svelte
@@ -7,7 +7,7 @@
   import { PRIMARY_READER_INDEX, type EmployeeCache, type EmployeeNames } from '$lib/employees';
   import Field from '../Field.svelte';
   import ErrorBanner from '../ErrorBanner.svelte';
-  import ActionButton from '../review/ActionButton.svelte';
+  import ActionButton from '../ActionButton.svelte';
   import PillButton from '../PillButton.svelte';
   import EmployeesDrawer from './EmployeesDrawer.svelte';
   import { IPV4 } from './logic';
diff --git a/oxibadge/src/lib/locales/en.json b/oxibadge/src/lib/locales/en.json
index adfe3ed..b80d0a6 100644
--- a/oxibadge/src/lib/locales/en.json
+++ b/oxibadge/src/lib/locales/en.json
@@ -114,7 +114,17 @@
     "export_warning_unrounded": "The times are complete, but some aren't rounded to {step} minutes. You can round them automatically before exporting, or export them as they are.",
     "back_to_review": "Back to review",
     "round_and_export": "Round and export",
-    "export_anyway": "Export anyway"
+    "export_anyway": "Export anyway",
+    "leave_confirm_title": "Unexported changes",
+    "leave_confirm_message": "If you leave now, the changes made in this review will be lost.",
+    "leave_anyway": "Leave without exporting",
+    "undo_day_aria": "Undo the changes to {label}",
+    "undo_short": "Undo",
+    "undo_all": "Undo changes",
+    "undo_all_title": "Restore this employee's times to what the time clock originally reported",
+    "undo_all_confirm_title": "Undo all changes?",
+    "undo_all_confirm_message": "All edited times for this employee will revert to what the time clock reported. This can't be undone.",
+    "undo_all_confirm": "Undo all changes"
   },
   "settings": {
     "title": "Settings",
diff --git a/oxibadge/src/lib/locales/it.json b/oxibadge/src/lib/locales/it.json
index 3ec3827..2417705 100644
--- a/oxibadge/src/lib/locales/it.json
+++ b/oxibadge/src/lib/locales/it.json
@@ -114,7 +114,17 @@
     "export_warning_unrounded": "Gli orari sono completi, ma alcuni non sono arrotondati a {step} minuti. Puoi arrotondarli automaticamente prima di esportare, oppure esportarli così come sono.",
     "back_to_review": "Torna alla revisione",
     "round_and_export": "Arrotonda ed esporta",
-    "export_anyway": "Esporta comunque"
+    "export_anyway": "Esporta comunque",
+    "leave_confirm_title": "Modifiche non esportate",
+    "leave_confirm_message": "Se esci ora, le modifiche fatte in questa revisione andranno perse.",
+    "leave_anyway": "Esci senza esportare",
+    "undo_day_aria": "Annulla le modifiche di {label}",
+    "undo_short": "Annulla",
+    "undo_all": "Annulla modifiche",
+    "undo_all_title": "Ripristina gli orari di questo dipendente a quelli letti dal timbratore",
+    "undo_all_confirm_title": "Annullare tutte le modifiche?",
+    "undo_all_confirm_message": "Tutti gli orari modificati per questo dipendente torneranno a quelli letti dal timbratore. L'operazione non si può annullare.",
+    "undo_all_confirm": "Annulla tutte le modifiche"
   },
   "settings": {
     "title": "Impostazioni",
diff --git a/oxibadge/src/routes/+page.svelte b/oxibadge/src/routes/+page.svelte
index e1fd6b8..3539828 100644
--- a/oxibadge/src/routes/+page.svelte
+++ b/oxibadge/src/routes/+page.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
   import { invoke } from '@tauri-apps/api/core';
+  import { getCurrentWindow } from '@tauri-apps/api/window';
   import { onMount } from 'svelte';
   import { _, locale } from 'svelte-i18n';
   import { monthName } from '$lib/month';
@@ -12,6 +13,7 @@
   import SettingsButton from '$lib/components/SettingsButton.svelte';
   import Settings from '$lib/components/Settings.svelte';
   import NewEmployees from '$lib/components/NewEmployees.svelte';
+  import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
   import { buildEmployees, type AttendanceRecord } from '$lib/components/review/fromRecords';
   import type { NewEmployee } from '$lib/components/new-employees/logic';
   import type { Shifts } from '$lib/shifts';
@@ -38,14 +40,45 @@
   let newEmployees = $state<NewEmployee[]>([]);
   // Placeholder: overwritten by load_settings before the review screen is reachable.
   let shifts = $state<Shifts>({ in1: '', out1: '', in2: '', out2: '', round_step_min: 0 });
+  let reviewDirty = $state(false);
+  let pendingLeaveAction = $state<null | (() => void)>(null);
 
   const period = $derived(`${monthName($locale, selectedMonth)} ${selectedYear}`);
   const reviewEmployees = $derived(buildEmployees(selectedYear, selectedMonth, records, employeeNames));
 
+  /** Runs `action` immediately, unless the review screen has unexported
+   * edits, in which case it asks for confirmation first. */
+  function requestLeaveReview(action: () => void) {
+    if (step === 'review' && reviewDirty) {
+      pendingLeaveAction = action;
+    } else {
+      action();
+    }
+  }
+
+  function confirmLeaveReview() {
+    const action = pendingLeaveAction;
+    pendingLeaveAction = null;
+    action?.();
+  }
+
+  function cancelLeaveReview() {
+    pendingLeaveAction = null;
+  }
+
   onMount(async () => {
     const settings = await invoke<SettingsData>('load_settings');
     shifts = settings.shifts;
     step = settings.readers[0] ? 'confirm-month' : 'setup';
+
+    // Lives for the whole app, so there's no need to ever unlisten.
+    const appWindow = getCurrentWindow();
+    await appWindow.onCloseRequested((event) => {
+      if (step === 'review' && reviewDirty) {
+        event.preventDefault();
+        requestLeaveReview(() => appWindow.destroy());
+      }
+    });
   });
 
   function openSettings() {
@@ -118,9 +151,10 @@
     month={selectedMonth}
     employees={reviewEmployees}
     shift={shifts}
-    onback={() => (step = 'confirm-month')}
+    onback={() => requestLeaveReview(() => (step = 'confirm-month'))}
     onexport={(payload) => invoke('export_timesheet', { payload })}
     onrename={onEmployeeRenamed}
+    ondirtychange={(dirty) => (reviewDirty = dirty)}
   />
 {:else if step === 'new-employees'}
   <NewEmployees employees={newEmployees} oncontinue={onNewEmployeesContinue} />
@@ -150,3 +184,15 @@
     {/if}
   </Screen>
 {/if}
+
+{#if pendingLeaveAction}
+  <ConfirmDialog
+    fixed
+    title={$_('review.leave_confirm_title')}
+    message={$_('review.leave_confirm_message')}
+    confirmLabel={$_('review.leave_anyway')}
+    cancelLabel={$_('review.cancel')}
+    onconfirm={confirmLeaveReview}
+    oncancel={cancelLeaveReview}
+  />
+{/if}