diff --git a/server/src/nest/backup/backup.impl.ts b/server/src/nest/backup/backup.impl.ts
index 00b8d74b6..c78f28ad6 100644
--- a/server/src/nest/backup/backup.impl.ts
+++ b/server/src/nest/backup/backup.impl.ts
@@ -6,7 +6,7 @@ import fs from 'fs';
 import Database from 'better-sqlite3';
 import { db, closeDb, reinitialize } from '../../db/database';
 import { VALID_INTERVALS } from './auto-backup.settings';
-import { invalidatePermissionsCache } from '../permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../permissions/permissions-cache';
 import { pluginsCodeRoot, pluginsDataRoot } from '../plugins/paths';
 import { stageExtractedPluginTrees, applyStagedRestoreNow } from '../plugins/plugin-backup';
 import { snapshotAllPluginDataDbs } from '../plugins/host/plugin-data.service';
diff --git a/server/src/nest/permissions/permissions-cache.ts b/server/src/nest/permissions/permissions-cache.ts
new file mode 100644
index 000000000..6557b6a09
--- /dev/null
+++ b/server/src/nest/permissions/permissions-cache.ts
@@ -0,0 +1,27 @@
+import type { PermissionLevel } from './permissions.service';
+
+/**
+ * The permissions cache — module state on purpose, in its own home (the
+ * oauth.pending-codes.ts precedent) so every path that must see one shared
+ * cache actually does: the container PermissionsService singleton, the
+ * permissions.bridge instance the MCP _shared helper reaches, and the plain
+ * backup restore path (backup.impl.ts), which is free functions by design and
+ * has nothing to hang an injected service off. A restore rewrites
+ * app_settings under the request path's feet; invalidating here is what keeps
+ * every reader consistent afterwards.
+ */
+let cache: Map<string, PermissionLevel> | null = null;
+
+export function getPermissionsCache(): Map<string, PermissionLevel> | null {
+  return cache;
+}
+
+/** Install a fresh cache map and return it (the loader fills it in place). */
+export function setPermissionsCache(next: Map<string, PermissionLevel>): Map<string, PermissionLevel> {
+  cache = next;
+  return next;
+}
+
+export function invalidatePermissionsCache(): void {
+  cache = null;
+}
diff --git a/server/src/nest/permissions/permissions.bridge.ts b/server/src/nest/permissions/permissions.bridge.ts
index 16fdde12c..f19ad0257 100644
--- a/server/src/nest/permissions/permissions.bridge.ts
+++ b/server/src/nest/permissions/permissions.bridge.ts
@@ -9,19 +9,15 @@ import { PermissionsService } from './permissions.service';
  * Inside the container, inject PermissionsService instead. Delete this file
  * when the MCP/OAuth mount moves behind the container.
  *
- * The permissions cache is module-scoped in permissions.service.ts, so this
- * instance and the container singleton share one cache — invalidating through
- * either flushes both (backup restores depend on this).
+ * The permissions cache is module-scoped in permissions-cache.ts, so this
+ * instance and the container singleton share one cache (backup restores
+ * invalidate it through that module directly).
  *
  * Module-level construction is safe: `db` is the reinitialize-proof Proxy onto
  * the shared better-sqlite3 singleton.
  */
 const permissions = new PermissionsService(new DatabaseService(db));
 
-export function invalidatePermissionsCache(): void {
-  permissions.invalidatePermissionsCache();
-}
-
 export function checkPermission(
   actionKey: string,
   userRole: string,
diff --git a/server/src/nest/permissions/permissions.service.ts b/server/src/nest/permissions/permissions.service.ts
index 291875ce7..e71b5ba96 100644
--- a/server/src/nest/permissions/permissions.service.ts
+++ b/server/src/nest/permissions/permissions.service.ts
@@ -1,6 +1,11 @@
 import { Injectable } from '@nestjs/common';
 import { DatabaseService } from '../database/database.service';
 import { logError } from '../audit/audit-log.logger';
+import {
+  getPermissionsCache,
+  setPermissionsCache,
+  invalidatePermissionsCache as invalidateSharedCache,
+} from './permissions-cache';
 
 /**
  * Permission levels (hierarchical, higher includes lower):
@@ -58,21 +63,22 @@ export const PERMISSION_ACTIONS: PermissionAction[] = [
 
 const ACTIONS_MAP = new Map(PERMISSION_ACTIONS.map(a => [a.key, a]));
 
-// In-memory cache, invalidated on save. Deliberately MODULE-scoped, not
-// instance state: two instances exist at runtime (the container singleton and
-// the permissions.bridge instance for out-of-container consumers), and legacy
-// callers — backupService invalidating after a restore, integration tests —
-// must flush the same cache the request path reads. Both instances wrap the
-// same shared connection, so a single cache is also the correct data shape.
-let cache: Map<string, PermissionLevel> | null = null;
+// The in-memory cache is deliberately MODULE-scoped, not instance state, and
+// lives in ./permissions-cache: two service instances exist at runtime (the
+// container singleton and the permissions.bridge instance for
+// out-of-container consumers), and the backup restore path — plain functions,
+// no DI — must flush the same cache the request path reads. Both instances
+// wrap the same shared connection, so a single cache is also the correct
+// data shape.
 
 @Injectable()
 export class PermissionsService {
   constructor(private readonly dbs: DatabaseService) {}
 
   private loadPermissions(): Map<string, PermissionLevel> {
-    if (cache) return cache;
-    cache = new Map<string, PermissionLevel>();
+    const cached = getPermissionsCache();
+    if (cached) return cached;
+    const cache = setPermissionsCache(new Map<string, PermissionLevel>());
     try {
       const rows = this.dbs.all<{ key: string; value: string }>(
         "SELECT key, value FROM app_settings WHERE key LIKE 'perm_%'"
@@ -98,7 +104,7 @@ export class PermissionsService {
   }
 
   invalidatePermissionsCache(): void {
-    cache = null;
+    invalidateSharedCache();
   }
 
   getPermissionLevel(actionKey: string): PermissionLevel {
diff --git a/server/src/nest/system-notices/system-notices.module.ts b/server/src/nest/system-notices/system-notices.module.ts
index 3a6761058..1255285a8 100644
--- a/server/src/nest/system-notices/system-notices.module.ts
+++ b/server/src/nest/system-notices/system-notices.module.ts
@@ -1,9 +1,11 @@
 import { Module } from '@nestjs/common';
+import { AddonsModule } from '../addons/addons.module';
 import { SystemNoticesController } from './system-notices.controller';
 import { SystemNoticesService } from './system-notices.service';
 
-/** System-notices domain (L2 leaf module). Registered in AppModule. */
+/** System-notices domain. Registered in AppModule. */
 @Module({
+  imports: [AddonsModule],
   controllers: [SystemNoticesController],
   providers: [SystemNoticesService],
 })
diff --git a/server/src/nest/system-notices/system-notices.service.ts b/server/src/nest/system-notices/system-notices.service.ts
index 872dd6990..f50dd64da 100644
--- a/server/src/nest/system-notices/system-notices.service.ts
+++ b/server/src/nest/system-notices/system-notices.service.ts
@@ -1,16 +1,21 @@
 import { Injectable } from '@nestjs/common';
 import type { SystemNoticeDto } from '@trek/shared';
 import { getActiveNoticesFor, dismissNotice } from '../../systemNotices/service';
+import { AddonsService } from '../addons/addons.service';
 
 /**
  * Thin Nest wrapper around the existing system-notices service. The condition
  * evaluation, version gating, sorting and dismissal persistence all stay in the
- * upstream service — this only adapts it for DI, so behaviour is unchanged.
+ * upstream service — this only adapts it for DI (and threads the injected
+ * addon-enablement check into the condition context, so the plain modules
+ * underneath carry no bridge import), so behaviour is unchanged.
  */
 @Injectable()
 export class SystemNoticesService {
+  constructor(private readonly addons: AddonsService) {}
+
   getActiveFor(userId: number): SystemNoticeDto[] {
-    return getActiveNoticesFor(userId) as SystemNoticeDto[];
+    return getActiveNoticesFor(userId, (addonId) => this.addons.isAddonEnabled(addonId)) as SystemNoticeDto[];
   }
 
   dismiss(userId: number, noticeId: string): boolean {
diff --git a/server/src/systemNotices/conditions.ts b/server/src/systemNotices/conditions.ts
index a3a1f3c7d..2dbff5ff8 100644
--- a/server/src/systemNotices/conditions.ts
+++ b/server/src/systemNotices/conditions.ts
@@ -1,11 +1,15 @@
 import semver from 'semver';
-import { isAddonEnabled } from '../nest/addons/addons.bridge.js';
 import type { NoticeCondition, SystemNotice } from './types.js';
 
 interface ConditionContext {
   user: { login_count: number; first_seen_version: string; role: string; noTrips: number };
   currentAppVersion: string;
   now: Date;
+  /**
+   * Addon-enablement check, threaded in by the caller (the Nest service passes
+   * its injected AddonsService) so this plain module carries no bridge import.
+   */
+  addonEnabled: (addonId: string) => boolean;
 }
 
 // Custom predicate registry — extensible without modifying this file
@@ -48,7 +52,7 @@ function evaluateOne(condition: NoticeCondition, ctx: ConditionContext): boolean
       return condition.roles.includes(ctx.user.role as 'admin' | 'user');
 
     case 'addonEnabled':
-      return isAddonEnabled(condition.addonId);
+      return ctx.addonEnabled(condition.addonId);
 
     case 'custom': {
       const fn = customPredicates.get(condition.id);
diff --git a/server/src/systemNotices/service.ts b/server/src/systemNotices/service.ts
index d5eb727d4..16f10f458 100644
--- a/server/src/systemNotices/service.ts
+++ b/server/src/systemNotices/service.ts
@@ -36,7 +36,10 @@ function severityWeight(s: string): number {
   return s === 'critical' ? 2 : s === 'warn' ? 1 : 0;
 }
 
-export function getActiveNoticesFor(userId: number): SystemNoticeDTO[] {
+export function getActiveNoticesFor(
+  userId: number,
+  addonEnabled: (addonId: string) => boolean
+): SystemNoticeDTO[] {
   const user = db.prepare(
     'SELECT login_count, first_seen_version, role FROM users WHERE id = ?'
   ).get(userId) as { login_count: number; first_seen_version: string; role: string } | undefined;
@@ -56,7 +59,7 @@ export function getActiveNoticesFor(userId: number): SystemNoticeDTO[] {
 
   const now = new Date();
   const currentAppVersion = getCurrentAppVersion();
-  const ctx = { user: { ...user, noTrips: tripCount }, currentAppVersion, now };
+  const ctx = { user: { ...user, noTrips: tripCount }, currentAppVersion, now, addonEnabled };
   const appVer = semver.coerce(currentAppVersion)?.version ?? '0.0.0';
 
   const isStillDismissed = (n: SystemNotice): boolean => {
diff --git a/server/tests/e2e/system-notices.e2e.test.ts b/server/tests/e2e/system-notices.e2e.test.ts
index 34adda5ac..cdbca93c5 100644
--- a/server/tests/e2e/system-notices.e2e.test.ts
+++ b/server/tests/e2e/system-notices.e2e.test.ts
@@ -30,6 +30,7 @@ vi.mock('../../src/systemNotices/service', () => ({
 }));
 
 import { SystemNoticesModule } from '../../src/nest/system-notices/system-notices.module';
+import { DatabaseModule } from '../../src/nest/database/database.module';
 import { TrekExceptionFilter } from '../../src/nest/common/trek-exception.filter';
 
 const notice = {
@@ -42,7 +43,10 @@ describe('System-notices e2e (real auth guard + temp SQLite)', () => {
   let app: Awaited<ReturnType<typeof build>>;
 
   async function build() {
-    const moduleRef = await Test.createTestingModule({ imports: [SystemNoticesModule] }).compile();
+    // DatabaseModule is @Global in the real app; a partial graph has to
+    // provide it for SystemNoticesModule's AddonsModule import (the
+    // addons.e2e precedent).
+    const moduleRef = await Test.createTestingModule({ imports: [DatabaseModule, SystemNoticesModule] }).compile();
     const nest = moduleRef.createNestApplication();
     nest.use(cookieParser());
     nest.useGlobalFilters(new TrekExceptionFilter());
@@ -71,7 +75,7 @@ describe('System-notices e2e (real auth guard + temp SQLite)', () => {
     const res = await request(server).get('/api/system-notices/active').set('Cookie', sessionCookie(1));
     expect(res.status).toBe(200);
     expect(res.body).toEqual([notice]);
-    expect(mockGetActive).toHaveBeenCalledWith(1);
+    expect(mockGetActive).toHaveBeenCalledWith(1, expect.any(Function));
   });
 
   it('204 with no body on a successful dismiss', async () => {
diff --git a/server/tests/integration/budget.test.ts b/server/tests/integration/budget.test.ts
index 92db6ed9c..a7b4c19ea 100644
--- a/server/tests/integration/budget.test.ts
+++ b/server/tests/integration/budget.test.ts
@@ -424,7 +424,7 @@ describe('Reorder budget items', () => {
 
     // Restrict budget_edit to trip_owner only
     testDb.prepare("INSERT OR REPLACE INTO app_settings (key, value) VALUES ('perm_budget_edit', 'trip_owner')").run();
-    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions.bridge');
+    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions-cache');
     invalidatePermissionsCache();
 
     const res = await request(app)
@@ -527,7 +527,7 @@ describe('Budget edit permission enforcement', () => {
     const trip = createTrip(testDb, owner.id);
     addTripMember(testDb, trip.id, member.id);
 
-    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions.bridge');
+    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions-cache');
     testDb.prepare("INSERT OR REPLACE INTO app_settings (key, value) VALUES ('perm_budget_edit', 'trip_owner')").run();
     invalidatePermissionsCache();
 
@@ -548,7 +548,7 @@ describe('Budget edit permission enforcement', () => {
     addTripMember(testDb, trip.id, member.id);
     createBudgetItem(testDb, trip.id, { name: 'Item', category: 'Transport' });
 
-    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions.bridge');
+    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions-cache');
     testDb.prepare("INSERT OR REPLACE INTO app_settings (key, value) VALUES ('perm_budget_edit', 'trip_owner')").run();
     invalidatePermissionsCache();
 
diff --git a/server/tests/integration/journey.test.ts b/server/tests/integration/journey.test.ts
index 7f912d71f..af2c9f11c 100644
--- a/server/tests/integration/journey.test.ts
+++ b/server/tests/integration/journey.test.ts
@@ -72,7 +72,7 @@ import {
   addJourneyContributor,
 } from '../helpers/factories';
 import { authCookie } from '../helpers/auth';
-import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions-cache';
 
 let nestApp: INestApplication;
 let app: Application;
diff --git a/server/tests/integration/places.test.ts b/server/tests/integration/places.test.ts
index 8a82b0b5a..7223d6ce7 100644
--- a/server/tests/integration/places.test.ts
+++ b/server/tests/integration/places.test.ts
@@ -56,7 +56,7 @@ import { resetTestDb, resetRateLimits } from '../helpers/test-db';
 import { createUser, createAdmin, createTrip, createPlace, addTripMember } from '../helpers/factories';
 import { authCookie } from '../helpers/auth';
 import { PlacesService } from '../../src/nest/places/places.service';
-import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions-cache';
 
 let nestApp: INestApplication;
 let app: Application;
diff --git a/server/tests/integration/share.test.ts b/server/tests/integration/share.test.ts
index 42d89dd56..b8484d8cf 100644
--- a/server/tests/integration/share.test.ts
+++ b/server/tests/integration/share.test.ts
@@ -307,7 +307,7 @@ describe('Shared trip access', () => {
     addTripMember(testDb, trip.id, member.id);
     await request(app).post(`/api/trips/${trip.id}/share-link`).set('Cookie', authCookie(owner.id)).send({});
 
-    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions.bridge');
+    const { invalidatePermissionsCache } = await import('../../src/nest/permissions/permissions-cache');
     testDb.prepare("INSERT OR REPLACE INTO app_settings (key, value) VALUES ('perm_share_manage', 'trip_member')").run();
     invalidatePermissionsCache();
     try {
diff --git a/server/tests/integration/todo.test.ts b/server/tests/integration/todo.test.ts
index 168bb2449..c5bad7e9f 100644
--- a/server/tests/integration/todo.test.ts
+++ b/server/tests/integration/todo.test.ts
@@ -44,7 +44,7 @@ import { runMigrations } from '../../src/db/migrations';
 import { resetTestDb, resetRateLimits } from '../helpers/test-db';
 import { createUser, createTrip, addTripMember } from '../helpers/factories';
 import { authCookie } from '../helpers/auth';
-import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions-cache';
 
 let nestApp: INestApplication;
 let app: Application;
diff --git a/server/tests/integration/trips.test.ts b/server/tests/integration/trips.test.ts
index aa473aad6..4fd5d5c6e 100644
--- a/server/tests/integration/trips.test.ts
+++ b/server/tests/integration/trips.test.ts
@@ -57,7 +57,7 @@ import { runMigrations } from '../../src/db/migrations';
 import { resetTestDb, resetRateLimits } from '../helpers/test-db';
 import { createUser, createAdmin, createTrip, addTripMember, createPlace, createReservation, createTag, createDayAccommodation, createBudgetItem, createPackingItem, createDayNote, createDayAssignment } from '../helpers/factories';
 import { authCookie } from '../helpers/auth';
-import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../../src/nest/permissions/permissions-cache';
 
 let nestApp: INestApplication;
 let app: Application;
diff --git a/server/tests/unit/mcp/tools-transit.test.ts b/server/tests/unit/mcp/tools-transit.test.ts
index b29a3573c..2ef2cda1f 100644
--- a/server/tests/unit/mcp/tools-transit.test.ts
+++ b/server/tests/unit/mcp/tools-transit.test.ts
@@ -1,6 +1,6 @@
 import { runMigrations } from '../../../src/db/migrations';
 import { createTables } from '../../../src/db/schema';
-import { invalidatePermissionsCache } from '../../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache } from '../../../src/nest/permissions/permissions-cache';
 import { PermissionsService } from '../../../src/nest/permissions/permissions.service';
 import { DatabaseService } from '../../../src/nest/database/database.service';
 import { addTripMember, createDay, createTrip, createUser } from '../../helpers/factories';
diff --git a/server/tests/unit/nest/permissions.service.test.ts b/server/tests/unit/nest/permissions.service.test.ts
index fd9c32d23..665b8a717 100644
--- a/server/tests/unit/nest/permissions.service.test.ts
+++ b/server/tests/unit/nest/permissions.service.test.ts
@@ -43,10 +43,8 @@ import { runMigrations } from '../../../src/db/migrations';
 import { logError } from '../../../src/nest/audit/audit-log.logger';
 import { DatabaseService } from '../../../src/nest/database/database.service';
 import { PermissionsService, PERMISSION_ACTIONS } from '../../../src/nest/permissions/permissions.service';
-import {
-  checkPermission as bridgeCheckPermission,
-  invalidatePermissionsCache as bridgeInvalidatePermissionsCache,
-} from '../../../src/nest/permissions/permissions.bridge';
+import { checkPermission as bridgeCheckPermission } from '../../../src/nest/permissions/permissions.bridge';
+import { invalidatePermissionsCache as invalidateSharedCache } from '../../../src/nest/permissions/permissions-cache';
 
 const svc = new PermissionsService(new DatabaseService(testDb));
 
@@ -253,11 +251,12 @@ describe('permissions.bridge delegation', () => {
     // (checkPermission for a plain member flips with the stored level).
     svc.savePermissions({ trip_edit: 'trip_member' });
     expect(bridgeCheckPermission('trip_edit', 'user', 10, 20, true)).toBe(true);
-    // Raw SQL write, then invalidate through the BRIDGE — the DI instance
-    // must serve the fresh value (backup-restore relies on exactly this).
+    // Raw SQL write, then invalidate through permissions-cache — the plain
+    // function backup.impl.ts calls after a restore. Both service instances
+    // must serve the fresh value afterwards.
     testDb.prepare('INSERT OR REPLACE INTO app_settings (key, value) VALUES (?, ?)').run('perm_trip_edit', 'trip_owner');
     expect(svc.getPermissionLevel('trip_edit')).toBe('trip_member'); // still cached
-    bridgeInvalidatePermissionsCache();
+    invalidateSharedCache();
     expect(svc.getPermissionLevel('trip_edit')).toBe('trip_owner');
     expect(bridgeCheckPermission('trip_edit', 'user', 10, 20, true)).toBe(false);
   });
diff --git a/server/tests/unit/systemNotices/conditions.test.ts b/server/tests/unit/systemNotices/conditions.test.ts
index 2aa214295..2a9d108f6 100644
--- a/server/tests/unit/systemNotices/conditions.test.ts
+++ b/server/tests/unit/systemNotices/conditions.test.ts
@@ -25,6 +25,9 @@ const baseCtx = {
   user: { login_count: 5, first_seen_version: '1.0.0', role: 'user', noTrips: 1 },
   currentAppVersion: '2.0.0',
   now: new Date('2026-06-01T00:00:00Z'),
+  // Threaded in by the caller since the addons.bridge import left this module;
+  // false keeps every case below reading as it did.
+  addonEnabled: () => false,
 };
 
 describe('firstLogin', () => {
@@ -100,3 +103,12 @@ describe('empty conditions', () => {
     expect(evaluate(baseNotice, baseCtx)).toBe(true);
   });
 });
+
+describe('addonEnabled', () => {
+  it('asks the threaded-in check with the condition addon id', () => {
+    const notice = noticeWith({ kind: 'addonEnabled', addonId: 'journey' });
+    expect(evaluate(notice, { ...baseCtx, addonEnabled: (id) => id === 'journey' })).toBe(true);
+    expect(evaluate(notice, { ...baseCtx, addonEnabled: (id) => id === 'vacay' })).toBe(false);
+    expect(evaluate(notice, baseCtx)).toBe(false);
+  });
+});