diff --git a/neode-ui/src/stores/__tests__/resourcesClear.test.ts b/neode-ui/src/stores/__tests__/resourcesClear.test.ts
new file mode 100644
index 00000000..7bda3863
--- /dev/null
+++ b/neode-ui/src/stores/__tests__/resourcesClear.test.ts
@@ -0,0 +1,139 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { setActivePinia, createPinia } from 'pinia'
+
+import { useResourcesStore } from '../resources'
+
+vi.mock('@/api/rpc-client', () => ({
+  rpcClient: {
+    logout: vi.fn(),
+  },
+}))
+
+describe('resources store — clearAll (T-02-02 logout purge)', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    sessionStorage.clear()
+    vi.useFakeTimers()
+  })
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('drops every in-memory entry', async () => {
+    const store = useResourcesStore()
+    await store.refresh('k1', async () => 'a')
+    await store.refresh('k2', async () => 'b')
+    expect(store.entries.size).toBe(2)
+    store.clearAll()
+    expect(store.entries.size).toBe(0)
+  })
+
+  it('removes every resource:-prefixed sessionStorage key and leaves unrelated keys untouched', async () => {
+    const store = useResourcesStore()
+    await store.refresh('k1', async () => 'a')
+    sessionStorage.setItem('unrelated-app-setting', 'keep-me')
+
+    expect(sessionStorage.getItem('resource:k1')).not.toBeNull()
+    expect(sessionStorage.getItem('unrelated-app-setting')).toBe('keep-me')
+
+    store.clearAll()
+
+    expect(sessionStorage.getItem('resource:k1')).toBeNull()
+    expect(sessionStorage.getItem('unrelated-app-setting')).toBe('keep-me')
+  })
+
+  it('cancels pending invalidate timers so a scheduled revalidate never fires post-logout', async () => {
+    const store = useResourcesStore()
+    await store.refresh('k1', async () => 'a')
+    const revalidate = vi.fn()
+    store.subscribe('k1', revalidate)
+    store.invalidate('k1') // schedules a debounced revalidate
+
+    store.clearAll()
+
+    // Advance past the debounce window — the cancelled timer must not fire.
+    vi.advanceTimersByTime(2000)
+    expect(revalidate).not.toHaveBeenCalled()
+  })
+
+  it('drops in-flight bookkeeping so a fetch resolving after clearAll does not repopulate memory or sessionStorage', async () => {
+    const store = useResourcesStore()
+    let resolveOld!: (v: string) => void
+    const oldFetch = new Promise<string>((res) => { resolveOld = res })
+    const p = store.refresh('k2', () => oldFetch)
+
+    store.clearAll()
+    // The key was dropped from `entries` by clearAll — a fresh lookup must
+    // not see the old session's in-flight fetch as still pending for it.
+    expect(store.entries.has('k2')).toBe(false)
+
+    resolveOld('stale-session-data')
+    await p
+
+    // The old fetch resolved after clearAll's generation bump — its result
+    // must be dropped, not written into a fresh entry or sessionStorage.
+    expect(store.entries.has('k2')).toBe(false)
+    const e = store.entry<string>('k2')
+    expect(e.data).toBeNull()
+    expect(sessionStorage.getItem('resource:k2')).toBeNull()
+  })
+
+  it('does not throw when sessionStorage.removeItem throws', async () => {
+    const store = useResourcesStore()
+    await store.refresh('k1', async () => 'a')
+    const spy = vi.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {
+      throw new Error('sessionStorage unavailable')
+    })
+    expect(() => store.clearAll()).not.toThrow()
+    spy.mockRestore()
+  })
+
+  it('does not throw when sessionStorage.key/length throw', async () => {
+    const store = useResourcesStore()
+    await store.refresh('k1', async () => 'a')
+    const spy = vi.spyOn(Storage.prototype, 'key').mockImplementation(() => {
+      throw new Error('sessionStorage inaccessible')
+    })
+    expect(() => store.clearAll()).not.toThrow()
+    spy.mockRestore()
+  })
+})
+
+describe('auth store — logout purges the cache even when the RPC rejects', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    sessionStorage.clear()
+    vi.resetModules()
+  })
+
+  it('clears the resources cache after a rejected rpcClient.logout()', async () => {
+    const { rpcClient } = await import('@/api/rpc-client')
+    vi.mocked(rpcClient.logout).mockRejectedValueOnce(new Error('network down'))
+
+    const resources = useResourcesStore()
+    await resources.refresh('some.cached.key', async () => 'sensitive-data')
+    expect(resources.entries.size).toBe(1)
+
+    const { useAuthStore } = await import('../auth')
+    const auth = useAuthStore()
+    await auth.logout()
+
+    expect(resources.entries.size).toBe(0)
+    expect(sessionStorage.getItem('resource:some.cached.key')).toBeNull()
+  })
+
+  it('clears the resources cache after a successful logout', async () => {
+    const { rpcClient } = await import('@/api/rpc-client')
+    vi.mocked(rpcClient.logout).mockResolvedValueOnce(undefined as never)
+
+    const resources = useResourcesStore()
+    await resources.refresh('another.key', async () => 'data')
+    expect(resources.entries.size).toBe(1)
+
+    const { useAuthStore } = await import('../auth')
+    const auth = useAuthStore()
+    await auth.logout()
+
+    expect(resources.entries.size).toBe(0)
+  })
+})
diff --git a/neode-ui/src/stores/auth.ts b/neode-ui/src/stores/auth.ts
index 29d06583..5966cb7c 100644
--- a/neode-ui/src/stores/auth.ts
+++ b/neode-ui/src/stores/auth.ts
@@ -4,6 +4,7 @@ import { defineStore } from 'pinia'
 import { ref } from 'vue'
 import { rpcClient } from '../api/rpc-client'
 import { useSyncStore } from './sync'
+import { useResourcesStore } from './resources'
 
 export const useAuthStore = defineStore('auth', () => {
   // State
@@ -84,6 +85,10 @@ export const useAuthStore = defineStore('auth', () => {
       sessionValidated = false
       localStorage.removeItem('neode-auth')
       sync.resetOnLogout()
+      // Purge every cached resource (memory + sessionStorage) regardless of
+      // whether the server-side logout RPC succeeded — a failed remote
+      // logout must not leave a locally-cached payload behind (T-02-02).
+      useResourcesStore().clearAll()
     }
   }
 
diff --git a/neode-ui/src/stores/resources.ts b/neode-ui/src/stores/resources.ts
index d0ea37ea..533d1b7c 100644
--- a/neode-ui/src/stores/resources.ts
+++ b/neode-ui/src/stores/resources.ts
@@ -56,6 +56,11 @@ export const useResourcesStore = defineStore('resources', () => {
   const inflight = new Map<string, Promise<void>>()
   const revalidators = new Map<string, Set<() => void>>()
   const invalidateTimers = new Map<string, ReturnType<typeof setTimeout>>()
+  // Bumped by clearAll() so an in-flight fetch from a just-ended session that
+  // resolves afterward can detect it and skip writing its result — without
+  // this guard the resolving promise would still call writeSnapshot() and
+  // repopulate sessionStorage even though the cache was just purged.
+  let generation = 0
 
   /** Get (or create) the reactive entry for a key, hydrating from the
    * sessionStorage snapshot on first sight so revisits after a reload paint
@@ -84,17 +89,22 @@ export const useResourcesStore = defineStore('resources', () => {
   ): Promise<void> {
     const existing = inflight.get(key)
     if (existing) return existing
+    const startGeneration = generation
     const e = entry<T>(key, opts.persist ?? true)
     e.loadState = e.loadState === 'ready' || e.loadState === 'refreshing' ? 'refreshing' : 'loading'
     const p = (async () => {
       try {
         const data = await fetcher()
+        // A clearAll() (logout) ran while this fetch was in flight — drop
+        // the result rather than repopulate a cache that was just purged.
+        if (generation !== startGeneration) return
         e.data = data
         e.error = null
         e.fetchedAt = Date.now()
         e.loadState = 'ready'
         if (opts.persist ?? true) writeSnapshot(key, data, e.fetchedAt)
       } catch (err) {
+        if (generation !== startGeneration) return
         e.error = err instanceof Error ? err.message : String(err)
         // Keep last-known data visible; only 'error' when we have nothing.
         e.loadState = e.data !== null ? 'ready' : 'error'
@@ -162,5 +172,29 @@ export const useResourcesStore = defineStore('resources', () => {
     }
   }
 
-  return { entries, entry, refresh, invalidate, subscribe, optimistic, evict }
+  /** Purge every cached resource — memory and sessionStorage — so no payload
+   * from this session outlives a logout or identity switch (T-02-02). Cancels
+   * pending invalidate timers and drops in-flight/revalidator bookkeeping
+   * first, so a fetch that resolves after this call cannot repopulate the
+   * cache with data from the ending session. */
+  function clearAll(): void {
+    generation++
+    for (const timer of invalidateTimers.values()) clearTimeout(timer)
+    invalidateTimers.clear()
+    inflight.clear()
+    revalidators.clear()
+    entries.clear()
+    try {
+      const keys: string[] = []
+      for (let i = 0; i < sessionStorage.length; i++) {
+        const k = sessionStorage.key(i)
+        if (k && k.startsWith(SNAPSHOT_PREFIX)) keys.push(k)
+      }
+      for (const k of keys) sessionStorage.removeItem(k)
+    } catch {
+      /* sessionStorage unavailable or inaccessible — memory is already clear */
+    }
+  }
+
+  return { entries, entry, refresh, invalidate, subscribe, optimistic, evict, clearAll }
 })