diff --git a/apps/desktop/src/app/session/hooks/use-session-actions.test.tsx b/apps/desktop/src/app/session/hooks/use-session-actions.test.tsx
index 57ef54e503..a20997708c 100644
--- a/apps/desktop/src/app/session/hooks/use-session-actions.test.tsx
+++ b/apps/desktop/src/app/session/hooks/use-session-actions.test.tsx
@@ -3549,4 +3549,47 @@ describe('removeSession / archiveSession profile routing (#78836)', () => {
     expect($messagingSessions.get().map(session => session.id)).toEqual(['tg-dual'])
     expect($sessions.get()).toEqual([])
   })
+
+  it('fails closed when a listed profile-less messaging DELETE cannot resolve an owner', async () => {
+    const row = storedSession({ id: 'tg-unresolved', source: 'telegram', title: 'QQ/TG' })
+    setMessagingSessions([row])
+    $pinnedSessionIds.set(['tg-unresolved'])
+    $sessionSeenCounts.set({
+      winefox: { 'tg-unresolved': 3 },
+      default: { 'desk-keep': 1 }
+    })
+    $unreadFinishedMarkers.set({
+      winefox: ['tg-unresolved'],
+      default: ['desk-keep']
+    })
+    mockGetSession.mockRejectedValue(new Error('404: Session not found'))
+
+    const handle = await readyActions()
+    await act(async () => {
+      await handle.removeSession('tg-unresolved')
+    })
+
+    expect(mockDeleteSession).not.toHaveBeenCalled()
+    expect($messagingSessions.get().map(session => session.id)).toEqual(['tg-unresolved'])
+    expect($sessions.get()).toEqual([])
+    expect($pinnedSessionIds.get()).toEqual(['tg-unresolved'])
+    expect($sessionSeenCounts.get().winefox?.['tg-unresolved']).toBe(3)
+    expect($unreadFinishedMarkers.get().winefox).toEqual(['tg-unresolved'])
+    expect($removedSessionIds.get().has('tg-unresolved')).toBe(false)
+    expect($sessionMutationsInFlight.get().has('tg-unresolved')).toBe(false)
+  })
+
+  it('fails closed when a listed profile-less messaging archive cannot resolve an owner', async () => {
+    setMessagingSessions([storedSession({ id: 'tg-arch-unresolved', source: 'telegram' })])
+    mockGetSession.mockRejectedValue(new Error('404: Session not found'))
+
+    const handle = await readyActions()
+    await act(async () => {
+      await handle.archiveSession('tg-arch-unresolved')
+    })
+
+    expect(mockSetSessionArchived).not.toHaveBeenCalled()
+    expect($messagingSessions.get().map(session => session.id)).toEqual(['tg-arch-unresolved'])
+    expect($sessions.get()).toEqual([])
+  })
 })
diff --git a/apps/desktop/src/app/session/hooks/use-session-actions/index.ts b/apps/desktop/src/app/session/hooks/use-session-actions/index.ts
index cd6a60a289..e39d74c3de 100644
--- a/apps/desktop/src/app/session/hooks/use-session-actions/index.ts
+++ b/apps/desktop/src/app/session/hooks/use-session-actions/index.ts
@@ -31,6 +31,7 @@ import {
   $gatewaySwapTarget,
   $newChatProfile,
   $newChatRoute,
+  $profiles,
   $showAllProfiles,
   type AgentProfileRoute,
   ensureGatewayAgent,
@@ -1953,7 +1954,21 @@ export function useSessionActions({
       // Messaging/cron rows frequently arrive without an inline profile; fall
       // back to the stored-session ownership lookup so their DELETE routes to
       // the owning profile instead of the ambient one.
-      const profile = removed?.profile?.trim() || (await resolveSessionProfile(storedSessionId))
+      const stampedProfile = removed?.profile?.trim()
+      const profile = stampedProfile || (await resolveSessionProfile(storedSessionId))
+
+      // Listed profile-less row + multiple profiles + unresolved owner:
+      // never fall through to the primary backend (fake already_absent).
+      if (
+        listed &&
+        !stampedProfile &&
+        !profile?.trim() &&
+        $profiles.get().filter(item => item.name.trim()).length > 1
+      ) {
+        notifyError(new Error('Session ownership could not be resolved'), copy.deleteFailed)
+
+        return
+      }
 
       const wasSelected = selectedStoredSessionId === storedSessionId
       const closingRuntimeId = wasSelected ? activeSessionId : null
@@ -2077,7 +2092,17 @@ export function useSessionActions({
 
       const listed = findListedSession(storedSessionId)
       const archived = listed?.session
-      const profile = archived?.profile?.trim() || (await resolveSessionProfile(storedSessionId))
+      const stampedProfile = archived?.profile?.trim()
+      const profile = stampedProfile || (await resolveSessionProfile(storedSessionId))
+      if (
+        listed &&
+        !stampedProfile &&
+        !profile?.trim() &&
+        $profiles.get().filter(item => item.name.trim()).length > 1
+      ) {
+        notifyError(new Error('Session ownership could not be resolved'), copy.archiveFailed)
+        return
+      }
       const wasSelected = selectedStoredSessionId === storedSessionId
       const previousPinned = $pinnedSessionIds.get()
       // Pins are keyed on the durable lineage-root id; the stored id may be the
diff --git a/tests/test_session_delete_profile_isolation.py b/tests/test_session_delete_profile_isolation.py
new file mode 100644
index 0000000000..1d995ae187
--- /dev/null
+++ b/tests/test_session_delete_profile_isolation.py
@@ -0,0 +1,51 @@
+"""Real-path proof for #78836: DELETE against the wrong profile is already_absent.
+
+The desktop bug is routing: messaging rows owned by ``winefox`` were DELETE'd
+against the primary ``default`` backend. This uses real SessionDB files under a
+temp HERMES_HOME — two profile databases, no mocks — and shows:
+
+- default DELETE does not remove the winefox row (already_absent)
+- winefox DELETE removes it
+- a subsequent winefox lookup stays gone
+"""
+
+from __future__ import annotations
+
+from hermes_state import SessionDB
+
+
+def _profile_db(home, name: str) -> SessionDB:
+    profile_dir = home / "profiles" / name if name != "default" else home
+    profile_dir.mkdir(parents=True, exist_ok=True)
+    return SessionDB(db_path=profile_dir / "state.db")
+
+
+def test_delete_against_default_does_not_remove_winefox_messaging_session(tmp_path):
+    home = tmp_path / ".hermes"
+    default_db = _profile_db(home, "default")
+    winefox_db = _profile_db(home, "winefox")
+    sid = "tg-winefox-realpath"
+
+    winefox_db.create_session(sid, source="telegram")
+    winefox_db.append_message(sid, "user", "hello from winefox")
+
+    assert winefox_db.resolve_session_id(sid)
+    assert default_db.resolve_session_id(sid) is None
+
+    default_hit = default_db.resolve_session_id(sid)
+    if not default_hit:
+        default_result = {"ok": True, "already_absent": True}
+    else:
+        default_db.delete_session(default_hit)
+        default_result = {"ok": True}
+
+    assert default_result == {"ok": True, "already_absent": True}
+    assert winefox_db.resolve_session_id(sid)
+
+    winefox_sid = winefox_db.resolve_session_id(sid)
+    assert winefox_sid
+    assert winefox_db.delete_session(winefox_sid) is True
+    assert winefox_db.resolve_session_id(sid) is None
+
+    default_db.close()
+    winefox_db.close()