diff --git a/apps/pwa/src/api/client.test.ts b/apps/pwa/src/api/client.test.ts
index 7f6a2f5..7bee75c 100644
--- a/apps/pwa/src/api/client.test.ts
+++ b/apps/pwa/src/api/client.test.ts
@@ -200,6 +200,115 @@ describe('fetchWritableCalendars', () => {
   })
 })
 
+// ── deleteEvent tests ─────────────────────────────────────────────────────────
+
+describe('deleteEvent', () => {
+  beforeEach(() => {
+    vi.stubGlobal('fetch', vi.fn())
+  })
+  afterEach(() => {
+    vi.unstubAllGlobals()
+  })
+
+  it('DELETEs /api/events/:uid with credentials:include', async () => {
+    const mockFetch = vi.mocked(fetch)
+    mockFetch.mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({}),
+    } as Response)
+
+    const { deleteEvent } = await import('./client.js')
+    await deleteEvent('uid-to-delete')
+
+    expect(mockFetch).toHaveBeenCalledWith(
+      '/api/events/uid-to-delete',
+      expect.objectContaining({
+        method: 'DELETE',
+        credentials: 'include',
+      }),
+    )
+  })
+
+  it('resolves void on success (204/202)', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({}),
+    } as Response)
+
+    const { deleteEvent } = await import('./client.js')
+    const result = await deleteEvent('uid-abc')
+    expect(result).toBeUndefined()
+  })
+
+  it('throws on non-ok response', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: false,
+      status: 404,
+    } as Response)
+
+    const { deleteEvent } = await import('./client.js')
+    await expect(deleteEvent('missing-uid')).rejects.toThrow()
+  })
+})
+
+// ── fetchSyncStatus tests ─────────────────────────────────────────────────────
+
+describe('fetchSyncStatus', () => {
+  beforeEach(() => {
+    vi.stubGlobal('fetch', vi.fn())
+  })
+  afterEach(() => {
+    vi.unstubAllGlobals()
+  })
+
+  it('GETs /api/events/sync-status?uid= with credentials:include', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({ uid: 'my-uid', status: 'pending' }),
+    } as Response)
+
+    const { fetchSyncStatus } = await import('./client.js')
+    await fetchSyncStatus('my-uid')
+
+    expect(vi.mocked(fetch)).toHaveBeenCalledWith(
+      '/api/events/sync-status?uid=my-uid',
+      expect.objectContaining({ credentials: 'include' }),
+    )
+  })
+
+  it('returns SyncStatus object with uid and status', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({ uid: 'test-uid', status: 'done' }),
+    } as Response)
+
+    const { fetchSyncStatus } = await import('./client.js')
+    const result = await fetchSyncStatus('test-uid')
+    expect(result).toEqual({ uid: 'test-uid', status: 'done' })
+  })
+
+  it('returns SyncStatus with error field for failed status', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: true,
+      json: async () => ({ uid: 'fail-uid', status: 'failed', error: '412 Conflict' }),
+    } as Response)
+
+    const { fetchSyncStatus } = await import('./client.js')
+    const result = await fetchSyncStatus('fail-uid')
+    expect(result).toEqual({ uid: 'fail-uid', status: 'failed', error: '412 Conflict' })
+  })
+
+  it('throws on non-ok response', async () => {
+    vi.mocked(fetch).mockResolvedValueOnce({
+      ok: false,
+      status: 500,
+    } as Response)
+
+    const { fetchSyncStatus } = await import('./client.js')
+    await expect(fetchSyncStatus('any-uid')).rejects.toThrow()
+  })
+})
+
 // ── Zustand store new keys tests ──────────────────────────────────────────────
 
 describe('calendarStore — eventForm keys', () => {
@@ -249,3 +358,54 @@ describe('calendarStore — eventForm keys', () => {
     expect(state.eventFormUid).toBeNull()
   })
 })
+
+describe('calendarStore — delete/sync keys', () => {
+  it('deleteDialogOpen defaults to false', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    const state = useCalendarStore.getState()
+    expect(state.deleteDialogOpen).toBe(false)
+  })
+
+  it('deleteDialogUid defaults to null', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    const state = useCalendarStore.getState()
+    expect(state.deleteDialogUid).toBeNull()
+  })
+
+  it('lastSyncedUid defaults to null', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    const state = useCalendarStore.getState()
+    expect(state.lastSyncedUid).toBeNull()
+  })
+
+  it('setDeleteDialog(true, uid) opens dialog with uid', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    useCalendarStore.getState().setDeleteDialog(true, 'delete-uid-999')
+    const state = useCalendarStore.getState()
+    expect(state.deleteDialogOpen).toBe(true)
+    expect(state.deleteDialogUid).toBe('delete-uid-999')
+  })
+
+  it('setDeleteDialog(false) closes dialog', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    useCalendarStore.getState().setDeleteDialog(true, 'some-uid')
+    useCalendarStore.getState().setDeleteDialog(false)
+    const state = useCalendarStore.getState()
+    expect(state.deleteDialogOpen).toBe(false)
+  })
+
+  it('setLastSyncedUid sets the UID', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    useCalendarStore.getState().setLastSyncedUid('synced-uid-abc')
+    const state = useCalendarStore.getState()
+    expect(state.lastSyncedUid).toBe('synced-uid-abc')
+  })
+
+  it('setLastSyncedUid(null) clears the UID', async () => {
+    const { useCalendarStore } = await import('../store/calendarStore.js')
+    useCalendarStore.getState().setLastSyncedUid('some-uid')
+    useCalendarStore.getState().setLastSyncedUid(null)
+    const state = useCalendarStore.getState()
+    expect(state.lastSyncedUid).toBeNull()
+  })
+})