README.md

@@ -213,7 +213,11 @@ closures, and pull-request merges. The separate SQLite journal retains at most
 10,000 events for 90 days and stores only bounded device labels and action targets.
 It never stores access tokens, cookies, session/CSRF values, credential IDs, raw
 network addresses, request bodies, or comment content. Keep its database on the
-same class of persistent, writable storage as the session registry.
+same class of persistent, writable storage as the session registry. Before a
+session revocation or issue closure, the journal durably reserves a pending event;
+if that reservation fails, the destructive action does not begin. A successful
+action remains truthfully reported even if its event cannot immediately be finalized,
+and the activity sheet marks that durable record as **Outcome confirmation pending**.
 
 After token bootstrap, **Active devices → Add a passkey for this device** enrolls a
 WebAuthn credential with required user verification. That device can then sign in

frontend/session.js

@@ -105,8 +105,12 @@
             title.textContent = labels[event.kind] || 'Security event';
             const details = root.document.createElement('span');
             details.className = 'small muted';
-            const context = [event.device_label, event.method, event.target]
-              .filter(value => typeof value === 'string' && value).join(' · ');
+            const context = [
+              event.device_label,
+              event.method,
+              event.target,
+              event.status === 'pending' ? 'Outcome confirmation pending' : null,
+            ].filter(value => typeof value === 'string' && value).join(' · ');
             details.textContent = `${new Date(event.created_at * 1000).toLocaleString()}${context ? ' · ' + context : ''}`;
             row.append(title, details);
             activityList.append(row);

src/main.py

@@ -1020,6 +1020,7 @@ async def list_security_events(
                     "device_label": event.device_label,
                     "target": event.target,
                     "created_at": event.created_at,
+                    "status": event.status,
                 }
                 for event in page.events
             ],
@@ -1508,25 +1509,38 @@ async def update_later_plan(payload: LaterOperation | LaterOperationBatch):
 @app.delete("/api/v1/session")
 async def sign_out(request: Request, response: Response):
     session = request.state.dashboard_session
+    journal = _security_event_store()
     try:
-        await asyncio.to_thread(dashboard_auth.revoke_session, session)
-        await asyncio.to_thread(
-            _security_event_store().record,
+        operation_id = await asyncio.to_thread(
+            journal.reserve,
             "sign_out",
             target="current_device",
         )
-    except dashboard_auth.SessionStoreError:
-        return JSONResponse(
-            {"detail": "Session registry is temporarily unavailable"},
-            status_code=503,
-            headers={"Cache-Control": "no-store"},
-        )
     except SecurityEventStoreError:
         return JSONResponse(
             {"detail": "Security activity is temporarily unavailable"},
             status_code=503,
             headers={"Cache-Control": "no-store"},
         )
+    try:
+        await asyncio.to_thread(dashboard_auth.revoke_session, session)
+    except dashboard_auth.SessionStoreError:
+        try:
+            await asyncio.to_thread(journal.discard, operation_id)
+        except SecurityEventStoreError:
+            pass
+        return JSONResponse(
+            {"detail": "Session registry is temporarily unavailable"},
+            status_code=503,
+            headers={"Cache-Control": "no-store"},
+        )
+    try:
+        await asyncio.to_thread(journal.finalize, operation_id)
+    except SecurityEventStoreError:
+        # The pending reservation is durable evidence; do not report a
+        # successful revocation as failed merely because completion could not
+        # be marked yet.
+        pass
     path = dashboard_auth.cookie_path(request)
     response.delete_cookie(
         dashboard_auth.SESSION_COOKIE,
@@ -1592,30 +1606,44 @@ async def revoke_active_device(
         target = next(
             (device for device in devices if device.management_id == management_id), None
         )
-        await asyncio.to_thread(_security_event_store().list, limit=1)
-        await asyncio.to_thread(_passkey_store().revoke_management_id, management_id)
-        revoked = await dashboard_auth.revoke_managed_session(management_id)
-        if target is not None and revoked:
-            await asyncio.to_thread(
-                _security_event_store().record,
-                "device_revoked",
-                device_label=target.device_label,
-                target="device",
-            )
     except dashboard_auth.SessionStoreError:
         return JSONResponse(
             {"detail": "Session registry is temporarily unavailable"},
             status_code=503,
             headers={"Cache-Control": "no-store"},
         )
+    if target is None:
+        raise HTTPException(status_code=404, detail="Active device not found")
+
+    journal = _security_event_store()
+    try:
+        operation_id = await asyncio.to_thread(
+            journal.reserve,
+            "device_revoked",
+            device_label=target.device_label,
+            target="device",
+        )
     except SecurityEventStoreError:
         return JSONResponse(
             {"detail": "Security activity is temporarily unavailable"},
             status_code=503,
             headers={"Cache-Control": "no-store"},
         )
-    if target is None or not revoked:
+    try:
+        await asyncio.to_thread(_passkey_store().revoke_management_id, management_id)
+        revoked = await dashboard_auth.revoke_managed_session(management_id)
+    except dashboard_auth.SessionStoreError:
+        return JSONResponse(
+            {"detail": "Session registry is temporarily unavailable"},
+            status_code=503,
+            headers={"Cache-Control": "no-store"},
+        )
+    if not revoked:
         raise HTTPException(status_code=404, detail="Active device not found")
+    try:
+        await asyncio.to_thread(journal.finalize, operation_id)
+    except SecurityEventStoreError:
+        pass
     return {"revoked": True, "current_session": target.current}
 
 
@@ -1633,26 +1661,32 @@ async def sign_out_all_devices(
         action="revoke_all_sessions",
         target="all",
     )
+    journal = _security_event_store()
     try:
-        await asyncio.to_thread(_passkey_store().revoke_all)
-        await dashboard_auth.revoke_all_sessions()
-        await asyncio.to_thread(
-            _security_event_store().record,
+        operation_id = await asyncio.to_thread(
+            journal.reserve,
             "all_sessions_revoked",
             target="all_devices",
         )
-    except dashboard_auth.SessionStoreError:
-        return JSONResponse(
-            {"detail": "Session registry is temporarily unavailable"},
-            status_code=503,
-            headers={"Cache-Control": "no-store"},
-        )
     except SecurityEventStoreError:
         return JSONResponse(
             {"detail": "Security activity is temporarily unavailable"},
             status_code=503,
             headers={"Cache-Control": "no-store"},
         )
+    try:
+        await asyncio.to_thread(_passkey_store().revoke_all)
+        await dashboard_auth.revoke_all_sessions()
+    except dashboard_auth.SessionStoreError:
+        return JSONResponse(
+            {"detail": "Session registry is temporarily unavailable"},
+            status_code=503,
+            headers={"Cache-Control": "no-store"},
+        )
+    try:
+        await asyncio.to_thread(journal.finalize, operation_id)
+    except SecurityEventStoreError:
+        pass
     path = dashboard_auth.cookie_path(request)
     response.delete_cookie(
         dashboard_auth.SESSION_COOKIE,
@@ -3309,21 +3343,20 @@ async def close_assigned_issue(
         target=f"{repository}#{number}",
     )
 
-    async def close_issue():
-        if not await gitea_proxy.is_assigned_issue(repository, number):
-            raise HTTPException(status_code=404, detail="Assigned issue not found")
-        return await gitea_proxy.close_issue(repository, number)
-
+    target = f"{repository}#{number}"
     try:
-        result = await asyncio.wait_for(
-            close_issue(), timeout=ISSUE_ACTION_TIMEOUT_SECONDS
+        assigned = await asyncio.wait_for(
+            gitea_proxy.is_assigned_issue(repository, number),
+            timeout=ISSUE_ACTION_TIMEOUT_SECONDS,
         )
-        await asyncio.to_thread(
-            _security_event_store().record,
+        if not assigned:
+            raise HTTPException(status_code=404, detail="Assigned issue not found")
+        journal = _security_event_store()
+        operation_id = await asyncio.to_thread(
+            journal.reserve,
             "issue_closed",
-            target=f"{repository}#{number}",
+            target=target,
         )
-        return result
     except HTTPException:
         raise
     except Exception:
@@ -3333,6 +3366,30 @@ async def close_assigned_issue(
             headers={"Retry-After": "1"},
         )
 
+    try:
+        result = await asyncio.wait_for(
+            gitea_proxy.close_issue(repository, number),
+            timeout=ISSUE_ACTION_TIMEOUT_SECONDS,
+        )
+    except Exception:
+        try:
+            await asyncio.to_thread(journal.discard, operation_id)
+        except SecurityEventStoreError:
+            pass
+        return JSONResponse(
+            {"error": "The issue could not be closed. It remains in My Work; please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+
+    try:
+        await asyncio.to_thread(journal.finalize, operation_id)
+    except SecurityEventStoreError:
+        # The close result is authoritative; the pending reservation preserves
+        # evidence without telling the operator the issue remains open.
+        pass
+    return result
+
 
 @app.get("/api/v1/repos/{owner}/{repo}/issues/{number}/labels")
 async def assigned_issue_label_options(

src/security_event_store.py

@@ -1,5 +1,6 @@
 """Bounded, privacy-preserving journal of operator security activity."""
 
+import secrets
 import sqlite3
 from dataclasses import dataclass
 from pathlib import Path
@@ -18,6 +19,7 @@ class SecurityEvent:
     device_label: str | None
     target: str | None
     created_at: int
+    status: str
 
 
 @dataclass(frozen=True)
@@ -61,20 +63,48 @@ class SecurityEventStore:
                     method TEXT,
                     device_label TEXT,
                     target TEXT,
-                    created_at INTEGER NOT NULL
+                    created_at INTEGER NOT NULL,
+                    status TEXT NOT NULL DEFAULT 'completed',
+                    operation_id TEXT
                 )
                 """
             )
+            columns = {
+                row[1] for row in connection.execute("PRAGMA table_info(security_events)")
+            }
+            if "status" not in columns:
+                connection.execute(
+                    "ALTER TABLE security_events ADD COLUMN status TEXT NOT NULL DEFAULT 'completed'"
+                )
+            if "operation_id" not in columns:
+                connection.execute(
+                    "ALTER TABLE security_events ADD COLUMN operation_id TEXT"
+                )
             connection.execute(
                 "CREATE INDEX IF NOT EXISTS security_events_created "
                 "ON security_events(created_at DESC, id DESC)"
             )
+            connection.execute(
+                "CREATE UNIQUE INDEX IF NOT EXISTS security_events_operation "
+                "ON security_events(operation_id) WHERE operation_id IS NOT NULL"
+            )
             return connection
         except (OSError, sqlite3.Error) as exc:
             raise SecurityEventStoreError(
                 "Security activity is temporarily unavailable"
             ) from exc
 
+    def _prune(self, connection: sqlite3.Connection, now: int) -> None:
+        connection.execute(
+            "DELETE FROM security_events WHERE created_at < ?",
+            (now - self.retention_seconds,),
+        )
+        connection.execute(
+            "DELETE FROM security_events WHERE id NOT IN "
+            "(SELECT id FROM security_events ORDER BY id DESC LIMIT ?)",
+            (self.max_events,),
+        )
+
     def record(
         self,
         kind: str,
@@ -87,12 +117,8 @@ class SecurityEventStore:
         try:
             with self._connect() as connection:
                 connection.execute(
-                    "DELETE FROM security_events WHERE created_at < ?",
-                    (now - self.retention_seconds,),
-                )
-                connection.execute(
-                    "INSERT INTO security_events(kind, method, device_label, target, created_at) "
-                    "VALUES (?, ?, ?, ?, ?)",
+                    "INSERT INTO security_events(kind, method, device_label, target, created_at, status) "
+                    "VALUES (?, ?, ?, ?, ?, 'completed')",
                     (
                         self._bounded(kind, 48) or "security_event",
                         self._bounded(method, 32),
@@ -101,10 +127,65 @@ class SecurityEventStore:
                         now,
                     ),
                 )
+                self._prune(connection, now)
+        except (OSError, sqlite3.Error) as exc:
+            raise SecurityEventStoreError(
+                "Security activity is temporarily unavailable"
+            ) from exc
+
+    def reserve(
+        self,
+        kind: str,
+        *,
+        method: str | None = None,
+        device_label: str | None = None,
+        target: str | None = None,
+    ) -> str:
+        now = int(self.clock())
+        operation_id = secrets.token_urlsafe(24)
+        try:
+            with self._connect() as connection:
                 connection.execute(
-                    "DELETE FROM security_events WHERE id NOT IN "
-                    "(SELECT id FROM security_events ORDER BY id DESC LIMIT ?)",
-                    (self.max_events,),
+                    "INSERT INTO security_events(kind, method, device_label, target, created_at, status, operation_id) "
+                    "VALUES (?, ?, ?, ?, ?, 'pending', ?)",
+                    (
+                        self._bounded(kind, 48) or "security_event",
+                        self._bounded(method, 32),
+                        self._bounded(device_label, 64),
+                        self._bounded(target, 255),
+                        now,
+                        operation_id,
+                    ),
+                )
+                self._prune(connection, now)
+        except (OSError, sqlite3.Error) as exc:
+            raise SecurityEventStoreError(
+                "Security activity is temporarily unavailable"
+            ) from exc
+        return operation_id
+
+    def finalize(self, operation_id: str) -> None:
+        try:
+            with self._connect() as connection:
+                cursor = connection.execute(
+                    "UPDATE security_events SET status = 'completed' WHERE operation_id = ?",
+                    (operation_id,),
+                )
+                if cursor.rowcount != 1:
+                    raise SecurityEventStoreError(
+                        "Security activity reservation was not found"
+                    )
+        except (OSError, sqlite3.Error) as exc:
+            raise SecurityEventStoreError(
+                "Security activity is temporarily unavailable"
+            ) from exc
+
+    def discard(self, operation_id: str) -> None:
+        try:
+            with self._connect() as connection:
+                connection.execute(
+                    "DELETE FROM security_events WHERE operation_id = ? AND status = 'pending'",
+                    (operation_id,),
                 )
         except (OSError, sqlite3.Error) as exc:
             raise SecurityEventStoreError(
@@ -122,7 +203,7 @@ class SecurityEventStore:
         try:
             with self._connect() as connection:
                 rows = connection.execute(
-                    "SELECT id, kind, method, device_label, target, created_at "
+                    "SELECT id, kind, method, device_label, target, created_at, status "
                     f"FROM security_events {where} ORDER BY id DESC LIMIT ?",
                     parameters,
                 ).fetchall()

tests/test_dashboard_auth.py

@@ -152,6 +152,7 @@ async def test_enrolled_passkey_can_sign_in_without_the_operator_token(
         "device_label": "Phone",
         "target": "dashboard",
         "created_at": activity.json()["events"][0]["created_at"],
+        "status": "completed",
     }
     assert "stackchain_session=" in signed_in.headers["set-cookie"]
     assert "correct horse battery staple" not in signed_in.text

tests/test_dashboard_session_frontend.py

@@ -614,6 +614,13 @@ process.stdout.write(JSON.stringify(state));
     ]
 
 
+def test_security_activity_explains_pending_outcome_confirmation():
+    source = SESSION_JS.read_text()
+
+    assert "Outcome confirmation pending" in source
+    assert "event.status === 'pending'" in source
+
+
 def test_authenticated_dashboard_load_requests_queued_delivery_resume():
     result = run_session_scenario(
         """

tests/test_security_activity.py

@@ -4,7 +4,7 @@ import httpx
 import pytest
 
 from src import main
-from src.security_event_store import SecurityEventStore
+from src.security_event_store import SecurityEventStore, SecurityEventStoreError
 
 
 @pytest.fixture
@@ -50,6 +50,7 @@ async def test_authenticated_security_activity_lists_private_sign_in_history(sec
                 "device_label": "Timmy's phone",
                 "target": "dashboard",
                 "created_at": activity.json()["events"][0]["created_at"],
+                "status": "completed",
             }
         ],
         "next_cursor": None,
@@ -121,6 +122,54 @@ async def test_revoked_device_activity_survives_live_session_removal(security_ac
     ]
 
 
+@pytest.mark.anyio
+async def test_remote_revocation_reservation_failure_preserves_the_device(
+    security_access, monkeypatch
+):
+    transport = httpx.ASGITransport(app=main.app)
+    async with (
+        httpx.AsyncClient(transport=transport, base_url="https://test") as phone,
+        httpx.AsyncClient(transport=transport, base_url="https://test") as laptop,
+    ):
+        await phone.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+        await laptop.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Laptop"},
+        )
+        devices = (await laptop.get("/api/v1/sessions")).json()["devices"]
+        target = next(device for device in devices if device["device_label"] == "Phone")
+        headers = {
+            "Origin": "https://test",
+            "X-CSRF-Token": laptop.cookies["stackchain_csrf"],
+        }
+        grant = await laptop.post(
+            "/api/v1/fresh-authorization",
+            json={
+                "access_token": "correct horse battery staple",
+                "action": "revoke_device",
+                "target": target["management_id"],
+            },
+            headers=headers,
+        )
+
+        class UnavailableJournal:
+            def reserve(self, *_args, **_kwargs):
+                raise SecurityEventStoreError("unavailable")
+
+        monkeypatch.setattr(main, "_security_event_store", lambda: UnavailableJournal())
+        response = await laptop.delete(
+            f"/api/v1/sessions/{target['management_id']}",
+            headers={**headers, "X-Step-Up-Grant": grant.json()["grant"]},
+        )
+        remaining = (await laptop.get("/api/v1/sessions")).json()["devices"]
+
+    assert response.status_code == 503
+    assert {device["device_label"] for device in remaining} == {"Phone", "Laptop"}
+
+
 @pytest.mark.anyio
 async def test_successful_protected_actions_record_only_bounded_targets(
     security_access, monkeypatch
@@ -185,6 +234,104 @@ async def test_successful_protected_actions_record_only_bounded_targets(
     assert b"abc123" not in persisted
 
 
+@pytest.mark.anyio
+async def test_issue_close_reservation_failure_prevents_the_gitea_mutation(
+    security_access, monkeypatch
+):
+    close_calls = []
+
+    async def yes(*_args):
+        return True
+
+    async def close(*args):
+        close_calls.append(args)
+        return {"number": 7, "state": "closed"}
+
+    class UnavailableJournal:
+        def reserve(self, *_args, **_kwargs):
+            raise SecurityEventStoreError("unavailable")
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_issue", yes)
+    monkeypatch.setattr(main.gitea_proxy, "close_issue", close)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="https://test") as client:
+        await client.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+        headers = {
+            "Origin": "https://test",
+            "X-CSRF-Token": client.cookies["stackchain_csrf"],
+        }
+        grant = await client.post(
+            "/api/v1/fresh-authorization",
+            json={
+                "access_token": "correct horse battery staple",
+                "action": "close_issue",
+                "target": "stackchain/api#7",
+            },
+            headers=headers,
+        )
+        monkeypatch.setattr(main, "_security_event_store", lambda: UnavailableJournal())
+        response = await client.patch(
+            "/api/v1/repos/stackchain/api/issues/7/close",
+            headers={**headers, "X-Step-Up-Grant": grant.json()["grant"]},
+        )
+
+    assert response.status_code == 503
+    assert close_calls == []
+
+
+@pytest.mark.anyio
+async def test_issue_close_finalization_failure_still_reports_the_closed_issue(
+    security_access, monkeypatch
+):
+    async def yes(*_args):
+        return True
+
+    async def close(*_args):
+        return {"number": 7, "state": "closed"}
+
+    class FinalizationUnavailable:
+        def reserve(self, *_args, **_kwargs):
+            return "durable-operation"
+
+        def finalize(self, _operation_id):
+            raise SecurityEventStoreError("unavailable")
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_issue", yes)
+    monkeypatch.setattr(main.gitea_proxy, "close_issue", close)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="https://test") as client:
+        await client.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+        headers = {
+            "Origin": "https://test",
+            "X-CSRF-Token": client.cookies["stackchain_csrf"],
+        }
+        grant = await client.post(
+            "/api/v1/fresh-authorization",
+            json={
+                "access_token": "correct horse battery staple",
+                "action": "close_issue",
+                "target": "stackchain/api#7",
+            },
+            headers=headers,
+        )
+        monkeypatch.setattr(
+            main, "_security_event_store", lambda: FinalizationUnavailable()
+        )
+        response = await client.patch(
+            "/api/v1/repos/stackchain/api/issues/7/close",
+            headers={**headers, "X-Step-Up-Grant": grant.json()["grant"]},
+        )
+
+    assert response.status_code == 200
+    assert response.json() == {"number": 7, "state": "closed"}
+
+
 @pytest.mark.anyio
 async def test_sign_out_is_journaled_before_the_session_is_removed(security_access):
     transport = httpx.ASGITransport(app=main.app)
@@ -211,6 +358,71 @@ async def test_sign_out_is_journaled_before_the_session_is_removed(security_acce
     ]
 
 
+@pytest.mark.anyio
+async def test_sign_out_reservation_failure_preserves_the_active_session(
+    security_access, monkeypatch
+):
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="https://test") as client:
+        await client.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+
+        class UnavailableJournal:
+            def reserve(self, *_args, **_kwargs):
+                raise SecurityEventStoreError("unavailable")
+
+        monkeypatch.setattr(main, "_security_event_store", lambda: UnavailableJournal())
+        response = await client.delete(
+            "/api/v1/session",
+            headers={
+                "Origin": "https://test",
+                "X-CSRF-Token": client.cookies["stackchain_csrf"],
+            },
+        )
+        still_authenticated = await client.get("/api/v1/sessions")
+
+    assert response.status_code == 503
+    assert still_authenticated.status_code == 200
+
+
+@pytest.mark.anyio
+async def test_sign_out_finalization_failure_reports_success_and_clears_cookies(
+    security_access, monkeypatch
+):
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="https://test") as client:
+        await client.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+
+        class FinalizationUnavailable:
+            def reserve(self, *_args, **_kwargs):
+                return "durable-operation"
+
+            def finalize(self, _operation_id):
+                raise SecurityEventStoreError("unavailable")
+
+        monkeypatch.setattr(
+            main, "_security_event_store", lambda: FinalizationUnavailable()
+        )
+        response = await client.delete(
+            "/api/v1/session",
+            headers={
+                "Origin": "https://test",
+                "X-CSRF-Token": client.cookies["stackchain_csrf"],
+            },
+        )
+        rejected = await client.get("/api/v1/sessions")
+
+    assert response.status_code == 200
+    assert response.json()["authenticated"] is False
+    assert "stackchain_session=" in response.headers["set-cookie"]
+    assert rejected.status_code == 401
+
+
 @pytest.mark.anyio
 async def test_sign_out_all_is_journaled_after_sessions_are_removed(security_access):
     transport = httpx.ASGITransport(app=main.app)
@@ -243,3 +455,42 @@ async def test_sign_out_all_is_journaled_after_sessions_are_removed(security_acc
     assert response.status_code == 200
     assert events[0].kind == "all_sessions_revoked"
     assert events[0].target == "all_devices"
+
+
+@pytest.mark.anyio
+async def test_sign_out_all_reservation_failure_preserves_the_active_session(
+    security_access, monkeypatch
+):
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="https://test") as client:
+        await client.post(
+            "/api/v1/session",
+            json={"access_token": "correct horse battery staple", "device_label": "Phone"},
+        )
+        headers = {
+            "Origin": "https://test",
+            "X-CSRF-Token": client.cookies["stackchain_csrf"],
+        }
+        grant = await client.post(
+            "/api/v1/fresh-authorization",
+            json={
+                "access_token": "correct horse battery staple",
+                "action": "revoke_all_sessions",
+                "target": "all",
+            },
+            headers=headers,
+        )
+
+        class UnavailableJournal:
+            def reserve(self, *_args, **_kwargs):
+                raise SecurityEventStoreError("unavailable")
+
+        monkeypatch.setattr(main, "_security_event_store", lambda: UnavailableJournal())
+        response = await client.delete(
+            "/api/v1/sessions",
+            headers={**headers, "X-Step-Up-Grant": grant.json()["grant"]},
+        )
+        still_authenticated = await client.get("/api/v1/sessions")
+
+    assert response.status_code == 503
+    assert still_authenticated.status_code == 200

tests/test_security_event_store.py

@@ -30,7 +30,10 @@ def test_security_events_are_private_bounded_and_reverse_chronological(tmp_path)
     columns = {
         row[1] for row in sqlite3.connect(store.path).execute("PRAGMA table_info(security_events)")
     }
-    assert columns == {"id", "kind", "method", "device_label", "target", "created_at"}
+    assert columns == {
+        "id", "kind", "method", "device_label", "target", "created_at",
+        "status", "operation_id",
+    }
 
 
 def test_security_event_retention_prunes_age_and_count(tmp_path):
@@ -52,3 +55,32 @@ def test_security_event_retention_prunes_age_and_count(tmp_path):
     now[0] = 20
     store.record("sign_out", device_label="Current")
     assert [event.kind for event in store.list(limit=10).events] == ["sign_out"]
+
+
+def test_security_event_reservation_is_durable_until_finalized(tmp_path):
+    store = SecurityEventStore(tmp_path / "security.sqlite3", clock=lambda: 1_000)
+
+    operation_id = store.reserve("issue_closed", target="stackchain/api#7")
+
+    pending = SecurityEventStore(
+        tmp_path / "security.sqlite3", clock=lambda: 1_001
+    ).list(limit=10).events
+    assert [(event.kind, event.target, event.status) for event in pending] == [
+        ("issue_closed", "stackchain/api#7", "pending")
+    ]
+
+    store.finalize(operation_id)
+
+    completed = store.list(limit=10).events
+    assert [(event.kind, event.target, event.status) for event in completed] == [
+        ("issue_closed", "stackchain/api#7", "completed")
+    ]
+
+
+def test_failed_operation_can_discard_its_pending_reservation(tmp_path):
+    store = SecurityEventStore(tmp_path / "security.sqlite3", clock=lambda: 1_000)
+    operation_id = store.reserve("issue_closed", target="stackchain/api#7")
+
+    store.discard(operation_id)
+
+    assert store.list(limit=10).events == []