release: prepare Desktop 0.13.10

src/main/assistant/assistant-database.ts

@@ -3,6 +3,7 @@ import { magicNoteCanvasAnalysisText } from '../../shared/magic-note-canvas-text
 import { knowledgeReferenceKey } from '../../shared/knowledge-reference'
 import { appendConversationQuestionBlock } from '../../shared/conversation-question-blocks'
 import { DatabaseSync } from 'node:sqlite'
+import { ExecutionStatsReader } from './execution-stats-reader'
 import { statSync } from 'node:fs'
 import { MagicNoteStorage } from '../magic-notes/magic-note-storage'
 import type { AssistantStorageProgress } from '../../shared/assistant-storage-contracts'
@@ -1786,13 +1787,20 @@ function deleteProjectRecords(
 }
 
 export class AssistantDatabase {
+  private static readonly executionStatsCacheTtlMs = 30_000
+  private static readonly executionStatsCacheLimit = 8
   private database?: DatabaseSync
+  private executionStatsReader?: ExecutionStatsReader
   private readonly noteStorage: MagicNoteStorage
   private readonly dirtyMagicNotes = new Set<string>()
   private readonly pendingMagicNoteCleanup = new Set<string | undefined>()
   private subagentProgress?: SubagentProgressStorage
   private channelEventWrites = 0
   private channelOutboxWrites = 0
+  private readonly executionStatsCache = new Map<
+    string,
+    { value: ExecutionStats; cachedAt: number; dataVersion: number; totalChanges: number }
+  >()
 
   constructor(
     private readonly databasePath: string,
@@ -2196,6 +2204,9 @@ export class AssistantDatabase {
   }
 
   close(): void {
+    this.executionStatsReader?.close()
+    this.executionStatsReader = undefined
+    this.executionStatsCache.clear()
     this.database?.close()
     this.database = undefined
     this.subagentProgress = undefined
@@ -4520,11 +4531,82 @@ export class AssistantDatabase {
     activeRequestIds: ReadonlySet<string> = new Set()
   ): ExecutionStats {
     const scope = executionStatsInputSchema.parse(input)
+    const cacheKey = 'conversationId' in scope
+      ? `conversation:${scope.conversationId}`
+      : `project:${scope.projectId}`
+    const database = this.requireDatabase()
+    // Never retain values read from a transaction that its caller can roll back.
+    if (database.isTransaction || activeRequestIds.size > 0) {
+      this.executionStatsCache.clear()
+      return this.readExecutionStatsSnapshot(scope, activeRequestIds)
+    }
+    const dataVersion = Number((database.prepare('PRAGMA data_version').get() as { data_version: number }).data_version)
+    const totalChanges = Number((database.prepare('SELECT total_changes() AS total_changes').get() as { total_changes: number }).total_changes)
+    const cached = activeRequestIds.size === 0
+      ? this.executionStatsCache.get(cacheKey)
+      : undefined
+    if (cached && cached.dataVersion === dataVersion && cached.totalChanges === totalChanges &&
+      Date.now() - cached.cachedAt < AssistantDatabase.executionStatsCacheTtlMs) {
+      this.executionStatsCache.delete(cacheKey)
+      this.executionStatsCache.set(cacheKey, cached)
+      return structuredClone(cached.value)
+    }
+    const result = this.readExecutionStatsSnapshot(scope, activeRequestIds)
+    this.executionStatsCache.delete(cacheKey)
+    this.executionStatsCache.set(cacheKey, {
+      value: structuredClone(result), cachedAt: Date.now(), dataVersion, totalChanges
+    })
+    while (this.executionStatsCache.size > AssistantDatabase.executionStatsCacheLimit) {
+      this.executionStatsCache.delete(this.executionStatsCache.keys().next().value!)
+    }
+    return result
+  }
+
+  getExecutionStatsAsync(
+    input: ExecutionStatsInput,
+    activeRequestIds: ReadonlySet<string>,
+    workerPath: string
+  ): Promise<ExecutionStats> {
+    this.requireDatabase()
+    const scope = executionStatsInputSchema.parse(input)
+    if (this.databasePath === ':memory:') {
+      return Promise.resolve(this.getExecutionStats(scope, activeRequestIds))
+    }
+    this.executionStatsReader ??= new ExecutionStatsReader(this.databasePath, workerPath)
+    return this.executionStatsReader.read(scope, activeRequestIds)
+  }
+
+  openReadOnly(): void {
+    if (this.database) throw new Error('Database already open')
+    this.database = new DatabaseSync(this.databasePath, { readOnly: true, timeout: 5_000 })
+  }
+
+  private readExecutionStatsSnapshot(
+    scope: ExecutionStatsInput,
+    activeRequestIds: ReadonlySet<string>
+  ): ExecutionStats {
+    const database = this.requireDatabase()
+    if (database.isTransaction) return this.computeExecutionStats(scope, activeRequestIds)
+    database.exec('BEGIN')
+    try {
+      const result = this.computeExecutionStats(scope, activeRequestIds)
+      database.exec('COMMIT')
+      return result
+    } catch (error) {
+      database.exec('ROLLBACK')
+      throw error
+    }
+  }
+
+  private computeExecutionStats(
+    scope: ExecutionStatsInput,
+    activeRequestIds: ReadonlySet<string>
+  ): ExecutionStats {
+    const database = this.requireDatabase()
     const result: ExecutionStats = {
       durationMs: 0, requestCount: 0, incompleteRequestCount: 0,
       activeRequestCount: 0, asOf: Date.now(), taskDurations: []
     }
-    const database = this.requireDatabase()
     const scopeId = 'conversationId' in scope ? scope.conversationId : scope.projectId
     const scopeColumn = 'conversationId' in scope ? 'conversation_id' : 'project_id'
     const durations = new Map<string, ExecutionStats['taskDurations'][number]>()

src/main/assistant/assistant-execution-stats.test.ts

@@ -67,6 +67,58 @@ describe('execution duration evidence', () => {
     expect(database.getExecutionStats({ conversationId: randomUUID() })).toMatchObject({ durationMs: 0, requestCount: 0 })
   })
 
+  it('invalidates cached scopes for local messages, remote events and external deletion', () => {
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(0)
+    database.saveLocalConversations([{
+      header: { id: conversationId, projectId, title: 'History', updatedAt: epoch },
+      messages: [{ id: randomUUID(), role: 'assistant', content: 'Retained', state: 'complete', createdAt: epoch }]
+    }])
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(1)
+    const id = request()
+    database.getExecutionStats({ projectId })
+    database.appendRemoteTaskEventOnce({ taskId: id, bindingId: randomUUID(), operationId: randomUUID(), semanticSequence: '1', eventIndex: 0, kind: 'done', payload: { requestId: id, type: 'done' } })
+    expect(database.getExecutionStats({ projectId }).incompleteRequestCount).toBe(1)
+    const raw = new DatabaseSync(join(directory, 'assistant.sqlite'))
+    try {
+      raw.prepare('DELETE FROM messages WHERE conversation_id = ?').run(conversationId)
+      raw.prepare('DELETE FROM tasks WHERE id = ?').run(id)
+      expect(database.getExecutionStats({ conversationId }).requestCount).toBe(0)
+      expect(database.getExecutionStats({ projectId }).requestCount).toBe(0)
+    } finally { raw.close() }
+  })
+
+  it('does not cache transaction snapshots across rollback, or serve a closed connection', () => {
+    const connection = (database as unknown as { database: DatabaseSync }).database
+    const id = request()
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(0)
+    connection.exec('BEGIN')
+    text(id)
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(1)
+    connection.exec('ROLLBACK')
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(0)
+    database.close()
+    expect(() => database.getExecutionStats({ conversationId })).toThrow()
+    database.initialize(directory)
+    expect(database.getExecutionStats({ conversationId }).requestCount).toBe(0)
+  })
+
+  it('bounds cache scopes, expires idle entries and isolates returned objects', () => {
+    const prepare = vi.spyOn(DatabaseSync.prototype, 'prepare')
+    const reads = (): number => prepare.mock.calls.filter(([sql]) => sql.includes('WITH scoped AS MATERIALIZED')).length
+    try {
+      const first = database.getExecutionStats({ projectId })
+      first.requestCount = 999
+      expect(database.getExecutionStats({ projectId }).requestCount).toBe(0)
+      expect(reads()).toBe(1)
+      for (let index = 0; index < 8; index++) database.getExecutionStats({ conversationId: randomUUID() })
+      database.getExecutionStats({ projectId })
+      expect(reads()).toBe(10)
+      at(31)
+      database.getExecutionStats({ projectId })
+      expect(reads()).toBe(11)
+    } finally { prepare.mockRestore() }
+  })
+
   it('excludes stable schedules, nested experts, and status-only maintenance but includes scheduled reply requests', () => {
     const schedule = database.createSchedule({ projectId, title: 'Schedule', prompt: 'Reply', workMode: 'ask', recurrence: 'daily', nextRunAt: new Date(epoch).toISOString() })
     database.updateTaskStatus(schedule.taskId, 'running')

src/main/assistant/execution-stats-reader.test.ts

@@ -0,0 +1,68 @@
+// @vitest-environment node
+import { randomUUID } from 'node:crypto'
+import { mkdtemp, rm } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join, resolve } from 'node:path'
+import { DatabaseSync } from 'node:sqlite'
+import { build } from 'esbuild'
+import { afterAll, beforeAll, expect, it } from 'vitest'
+import { AssistantDatabase } from './assistant-database'
+import { ExecutionStatsReader } from './execution-stats-reader'
+
+let directory: string
+let workerPath: string
+beforeAll(async () => {
+  directory = await mkdtemp(join(tmpdir(), 'goodbuddy-statistics-reader-'))
+  workerPath = process.env.GOODBUDDY_STATS_WORKER_PATH ?? join(directory, 'worker.cjs')
+  if (!process.env.GOODBUDDY_STATS_WORKER_PATH) {
+    await build({ entryPoints: [resolve('src/main/execution-stats-worker.ts')], outfile: workerPath,
+      bundle: true, platform: 'node', format: 'cjs', logLevel: 'silent' })
+  }
+})
+afterAll(async () => { await rm(directory, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 }) })
+
+it('reads committed WAL evidence off-thread without recovering live tasks and refreshes external writes', async () => {
+  const path = join(directory, 'assistant.sqlite')
+  const database = new AssistantDatabase(path)
+  database.initialize(directory)
+  const projectId = database.listProjects()[0]!.id
+  const conversationId = randomUUID()
+  const id = randomUUID()
+  database.createTask({ id, projectId, conversationId, title: 'Live', instructions: 'Reply', workMode: 'ask', visible: false })
+  database.appendTaskEvent(id, 'text', { requestId: id, type: 'text', delta: 'Reply' })
+  const sql = new DatabaseSync(path)
+  try {
+    const status = database.getTask(id).status
+    const [conversation, project] = await Promise.all([
+      database.getExecutionStatsAsync({ conversationId }, new Set([id]), workerPath),
+      database.getExecutionStatsAsync({ projectId }, new Set([id]), workerPath)
+    ])
+    expect(conversation).toMatchObject({ requestCount: 1, activeRequestCount: 1, incompleteRequestCount: 0 })
+    expect(project.requestCount).toBe(1)
+    expect(database.getTask(id).status).toBe(status)
+    database.updateTaskStatus(id, 'completed')
+    expect(await database.getExecutionStatsAsync({ conversationId }, new Set(), workerPath)).toMatchObject({ requestCount: 1, activeRequestCount: 0 })
+    sql.exec('BEGIN IMMEDIATE')
+    sql.prepare('DELETE FROM tasks WHERE id = ?').run(id)
+    expect((await database.getExecutionStatsAsync({ conversationId }, new Set(), workerPath)).requestCount).toBe(1)
+    sql.exec('ROLLBACK')
+    expect((await database.getExecutionStatsAsync({ conversationId }, new Set(), workerPath)).requestCount).toBe(1)
+    sql.prepare('DELETE FROM tasks WHERE id = ?').run(id)
+    expect((await database.getExecutionStatsAsync({ conversationId }, new Set(), workerPath)).requestCount).toBe(0)
+    // A returned result must not leave a read transaction pinning the WAL.
+    expect(sql.prepare('PRAGMA wal_checkpoint(TRUNCATE)').get()?.busy).toBe(0)
+    const pending = database.getExecutionStatsAsync({ projectId }, new Set(), workerPath)
+    const rejection = expect(pending).rejects.toThrow('closed')
+    database.close()
+    await rejection
+  } finally { sql.close(); database.close() }
+})
+
+it('rejects worker startup errors and permits the next read to retry', async () => {
+  const reader = new ExecutionStatsReader(join(directory, 'missing.sqlite'), workerPath)
+  try {
+    for (let attempt = 0; attempt < 2; attempt++) {
+      await expect(reader.read({ projectId: randomUUID() }, new Set())).rejects.toThrow()
+    }
+  } finally { reader.close() }
+})

src/main/assistant/execution-stats-reader.ts

@@ -0,0 +1,52 @@
+import { Worker } from 'node:worker_threads'
+import type { ExecutionStats, ExecutionStatsInput } from '../../shared/assistant-contracts'
+
+export class ExecutionStatsReader {
+  private worker?: Worker
+  private nextId = 0
+  private readonly pending = new Map<number, {
+    resolve: (value: ExecutionStats) => void
+    reject: (error: Error) => void
+  }>()
+
+  constructor(private readonly databasePath: string, private readonly workerPath: string) {}
+
+  read(scope: ExecutionStatsInput, activeRequestIds: ReadonlySet<string>): Promise<ExecutionStats> {
+    if (!this.worker) {
+      const worker = new Worker(this.workerPath, { workerData: { databasePath: this.databasePath } })
+      this.worker = worker
+      worker.on('message', (message: { id: number; result?: ExecutionStats; error?: string }) => {
+        const request = this.pending.get(message.id)
+        if (!request) return
+        this.pending.delete(message.id)
+        if (message.result) request.resolve(message.result)
+        else request.reject(new Error(message.error ?? 'Statistics query failed'))
+      })
+      const failed = (error: Error): void => {
+        if (this.worker !== worker) return
+        this.worker = undefined
+        for (const request of this.pending.values()) request.reject(error)
+        this.pending.clear()
+        void worker.terminate()
+      }
+      worker.once('error', failed)
+      worker.once('exit', (code) => failed(new Error(`Statistics worker exited (${code})`)))
+      worker.unref()
+    }
+    // Bound outstanding work when a window repeatedly changes scope during a slow read.
+    if (this.pending.size >= 16) return Promise.reject(new Error('Statistics reader is busy'))
+    const id = ++this.nextId
+    return new Promise((resolve, reject) => {
+      this.pending.set(id, { resolve, reject })
+      this.worker!.postMessage({ id, scope, activeRequestIds: [...activeRequestIds] })
+    })
+  }
+
+  close(): void {
+    const worker = this.worker
+    this.worker = undefined
+    for (const request of this.pending.values()) request.reject(new Error('Statistics reader closed'))
+    this.pending.clear()
+    if (worker) void worker.terminate()
+  }
+}

src/main/execution-stats-worker.ts

@@ -0,0 +1,17 @@
+import { parentPort, workerData } from 'node:worker_threads'
+import type { ExecutionStatsInput } from '../shared/assistant-contracts'
+import { AssistantDatabase } from './assistant/assistant-database'
+
+const database = new AssistantDatabase((workerData as { databasePath: string }).databasePath)
+database.openReadOnly()
+parentPort!.on('message', (message: {
+  id: number; scope: ExecutionStatsInput; activeRequestIds: string[]
+}) => {
+  try {
+    const result = database.getExecutionStats(message.scope, new Set(message.activeRequestIds))
+    parentPort!.postMessage({ id: message.id, result })
+  } catch (error) {
+    parentPort!.postMessage({ id: message.id, error: error instanceof Error ? error.message : String(error) })
+  }
+})
+parentPort!.on('close', () => database.close())

src/main/ipc.test.ts

@@ -1324,6 +1324,7 @@ describe('registerIpcHandlers model download source routing', () => {
 vi.mock('electron', () => ({
   nativeImage: { createFromBuffer: (buffer: Buffer) => ({ isEmpty: () => false, toPNG: () => buffer }) },
   app: {
+    getAppPath: vi.fn(() => process.cwd()),
     getName: vi.fn(() => 'GoodBuddy'),
     getVersion: vi.fn(() => '0.1.0')
   },
@@ -4382,7 +4383,7 @@ describe('registerIpcHandlers token usage', () => {
       queueDueSchedules: vi.fn(() => []),
       listConversationQueueItems: vi.fn(() => []),
       listPendingConversationQueueIds: vi.fn(() => []),
-      getExecutionStats: vi.fn(() => summary)
+      getExecutionStatsAsync: vi.fn(async () => summary)
     }
     const webContents = {
       mainFrame: { url: 'file:///goodbuddy/index.html' },
@@ -4400,13 +4401,13 @@ describe('registerIpcHandlers token usage', () => {
       const event = { sender: webContents, senderFrame: webContents.mainFrame }
       const id = '00000000-0000-4000-8000-000000000301'
       for (const scope of [{ conversationId: id }, { projectId: id }]) {
-        expect(handler(event, scope)).toBe(summary)
-        expect(assistantDatabase.getExecutionStats).toHaveBeenLastCalledWith(scope, new Set())
+        await expect(handler(event, scope)).resolves.toEqual(summary)
+        expect(assistantDatabase.getExecutionStatsAsync).toHaveBeenLastCalledWith(scope, new Set(), expect.stringContaining('execution-stats-worker.js'))
       }
       expect(() => handler(event, {})).toThrow()
       expect(() => handler(event, { projectId: id, conversationId: id })).toThrow()
       expect(() => handler({ sender: {}, senderFrame: webContents.mainFrame }, { projectId: id })).toThrow()
-      expect(assistantDatabase.getExecutionStats).toHaveBeenCalledTimes(2)
+      expect(assistantDatabase.getExecutionStatsAsync).toHaveBeenCalledTimes(2)
     } finally {
       await dispose()
     }

src/main/ipc.ts

@@ -7504,9 +7504,10 @@ export function registerIpcHandlers(
   })
   registerHandler(ipcChannels.tasksExecutionStats, (event, input: unknown) => {
     assertTrustedSender(event, window)
-    return assistantDatabase.getExecutionStats(
+    return assistantDatabase.getExecutionStatsAsync(
       executionStatsInputSchema.parse(input),
-      new Set([...activeRequests].filter(([, lease]) => lease.isReply && !lease.controller.signal.aborted).map(([id]) => id))
+      new Set([...activeRequests].filter(([, lease]) => lease.isReply && !lease.controller.signal.aborted).map(([id]) => id)),
+      join(app.getAppPath(), 'out/main/execution-stats-worker.js')
     )
   })
   registerHandler(ipcChannels.tasksSetStatus, (event, input: unknown) => {

src/renderer/src/App.test.tsx

@@ -4372,11 +4372,7 @@ describe("App", () => {
     const dialog = screen.getByRole("alertdialog", {
       name: "确认永久删除对话 新对话",
     });
-    expect(dialog).toHaveTextContent("将永久删除此会话的全部内容");
-    expect(dialog).toHaveTextContent(
-      "如果此会话有正在运行的任务，也会同时停止",
-    );
-    expect(dialog).toHaveTextContent("此操作不可恢复");
+      expect(dialog).not.toHaveTextContent("将永久删除此会话的全部内容");
     const cancel = screen.getByRole("button", {
       name: "取消删除对话 新对话",
     });

src/renderer/src/App.tsx

@@ -9373,7 +9373,6 @@ function App(): React.JSX.Element {
                           }
                           disabled={deletingConversationId === conversation.id}
                           icon={<Trash2 aria-hidden="true" size={14} />}
-                          message={t("conversation.delete.message")}
                           onCancel={() => setConfirmingConversationId("")}
                           onConfirm={() =>
                             void deleteConversation(conversation.id)

src/renderer/src/WorkbarShell.test.tsx

@@ -10,6 +10,7 @@ import {
 import { readFileSync } from 'node:fs'
 import { join } from 'node:path'
 import {
+  useEffect,
   useState,
   type ReactNode
 } from 'react'
@@ -86,6 +87,34 @@ function ControlledShell({
 }
 
 describe('WorkbarShell', () => {
+  it('preserves task state and latest props while keeping hidden terminal and browser effects live', () => {
+    const stopped = vi.fn()
+    function Panel({ id, value }: { id: string; value: string }): ReactNode {
+      const [count, setCount] = useState(0)
+      useEffect(() => () => stopped(id), [id])
+      return <button onClick={() => setCount(count + 1)}>{id}:{value}:{count}</button>
+    }
+    const props = {
+      instances: [...DEFAULT_WORKBAR_INSTANCES, terminalOne],
+      onActiveInstanceChange: vi.fn(), onCloseInstance: vi.fn(), onCreateInstance: vi.fn(),
+      onResolveTerminalTarget: (): WorkbarTargetRef => ({ type: 'local' })
+    }
+    const panel = (value: string) => (instance: WorkbarTabInstance): ReactNode =>
+      <Panel id={instance.appId} value={value} />
+    const { rerender } = render(<WorkbarShell {...props}
+      activeInstanceId={DEFAULT_WORKBAR_INSTANCES[0]!.id} renderPanel={panel('old')} />)
+    fireEvent.click(screen.getByRole('button', { name: 'tasks:old:0' }))
+    rerender(<WorkbarShell {...props} activeInstanceId={terminalOne.id} renderPanel={panel('new')} />)
+    expect(stopped).toHaveBeenCalledWith('tasks')
+    expect(stopped).not.toHaveBeenCalledWith('terminal')
+    expect(stopped).not.toHaveBeenCalledWith('browser')
+    rerender(<WorkbarShell {...props}
+      activeInstanceId={DEFAULT_WORKBAR_INSTANCES[0]!.id} renderPanel={panel('latest')} />)
+    expect(screen.getByRole('button', { name: 'tasks:latest:1' })).toBeVisible()
+    expect(stopped).not.toHaveBeenCalledWith('terminal')
+    expect(stopped).not.toHaveBeenCalledWith('browser')
+  })
+
   it('shows overflow controls, scrolls without switching tabs, and hides them after widening', () => {
     let resize = (): void => {}
     vi.stubGlobal('ResizeObserver', class {

src/renderer/src/WorkbarShell.tsx

@@ -10,6 +10,7 @@ import {
   type LucideIcon
 } from 'lucide-react'
 import {
+  Activity,
   useCallback,
   useEffect,
   useId,
@@ -77,6 +78,15 @@ export type WorkbarShellProps = {
   className?: string
 }
 
+type WorkbarPanelProps = {
+  instance: WorkbarTabInstance
+  renderPanel: (instance: WorkbarTabInstance) => ReactNode
+}
+
+function WorkbarPanel({ instance, renderPanel }: WorkbarPanelProps): React.JSX.Element {
+  return <>{renderPanel(instance)}</>
+}
+
 function joinClassNames(...values: (string | false | undefined)[]): string {
   return values.filter(Boolean).join(' ')
 }
@@ -525,7 +535,11 @@ export function WorkbarShell({
             role="tabpanel"
             tabIndex={0}
           >
-            {renderPanel(instance)}
+            {instance.appId === 'tasks' ? (
+              <Activity mode={!catalogOpen && instance.id === activeInstanceId ? 'visible' : 'hidden'}>
+                <WorkbarPanel instance={instance} renderPanel={renderPanel} />
+              </Activity>
+            ) : <WorkbarPanel instance={instance} renderPanel={renderPanel} />}
           </div>
         ))}
 

src/renderer/src/use-execution-stats.test.tsx

@@ -49,6 +49,16 @@ afterEach(() => {
 })
 
 describe('useExecutionStats', () => {
+  it('retains snapshot references for identical cached polling results', async () => {
+    getExecutionStats.mockImplementation(async () => stats(10))
+    const { result } = renderStats()
+    await act(async () => {})
+    const before = result.current
+    await act(async () => { vi.advanceTimersByTime(5_000) })
+    expect(result.current.conversation).toBe(before.conversation)
+    expect(result.current.project).toBe(before.project)
+    expect(getExecutionStats).toHaveBeenCalledTimes(4)
+  })
   it.each(['project', 'conversation'] as const)(
     'clears the previous %s selection and ignores its late polling result', async (scope) => {
       const { result, rerender } = renderStats()

src/renderer/src/use-execution-stats.ts

@@ -1,4 +1,4 @@
-import { useEffect, useState } from 'react'
+import { startTransition, useEffect, useState } from 'react'
 import type { ExecutionStats } from '../../shared/assistant-contracts'
 
 // Keep timing evidence in Main; never extrapolate a stopped or disconnected run.
@@ -26,11 +26,18 @@ export function useExecutionStats(
         window.goodbuddy.tasks.getExecutionStats({ projectId })
       ])
       pending = false
-      if (!cancelled) setSnapshot({
-        conversationId, projectId,
-        conversation: conversation.status === 'fulfilled' ? conversation.value : undefined,
-        project: project.status === 'fulfilled' ? project.value : undefined
-      })
+      if (!cancelled) startTransition(() => setSnapshot((current) => {
+        const next = {
+          conversationId, projectId,
+          conversation: conversation.status === 'fulfilled' ? conversation.value : undefined,
+          project: project.status === 'fulfilled' ? project.value : undefined
+        }
+        // IPC clones cached snapshots. Preserve references when their contents are unchanged
+        // so idle polling does not rerender App and rebuild task duration maps.
+        return current.conversationId === conversationId && current.projectId === projectId &&
+          JSON.stringify(current.conversation) === JSON.stringify(next.conversation) &&
+          JSON.stringify(current.project) === JSON.stringify(next.project) ? current : next
+      }))
     }
     void refresh()
     const interval = window.setInterval(() => { void refresh() }, 5_000)