diff --git a/core/db.py b/core/db.py
index bf1d10c..dfc7047 100644
--- a/core/db.py
+++ b/core/db.py
@@ -773,12 +773,6 @@ def _migrate(conn: sqlite3.Connection):
                 PRAGMA foreign_keys=ON;
             """)
 
-    # KIN-126: Add completed_at to tasks — set when task transitions to 'done'
-    task_cols_final = {r[1] for r in conn.execute("PRAGMA table_info(tasks)").fetchall()}
-    if "completed_at" not in task_cols_final:
-        conn.execute("ALTER TABLE tasks ADD COLUMN completed_at DATETIME DEFAULT NULL")
-        conn.commit()
-
 
 def _seed_default_hooks(conn: sqlite3.Connection):
     """Seed default hooks for the kin project (idempotent).
diff --git a/core/models.py b/core/models.py
index 6d004f3..dde8f65 100644
--- a/core/models.py
+++ b/core/models.py
@@ -304,15 +304,13 @@ def list_tasks(
 
 
 def update_task(conn: sqlite3.Connection, id: str, **fields) -> dict:
-    """Update task fields. Auto-sets updated_at. Sets completed_at when status transitions to 'done'."""
+    """Update task fields. Auto-sets updated_at."""
     if not fields:
         return get_task(conn, id)
     json_cols = ("brief", "spec", "review", "test_result", "security_result", "labels")
     for key in json_cols:
         if key in fields:
             fields[key] = _json_encode(fields[key])
-    if "status" in fields and fields["status"] == "done":
-        fields["completed_at"] = datetime.now().isoformat()
     fields["updated_at"] = datetime.now().isoformat()
     sets = ", ".join(f"{k} = ?" for k in fields)
     vals = list(fields.values()) + [id]
diff --git a/tests/test_kin_126_regression.py b/tests/test_kin_126_regression.py
deleted file mode 100644
index 5c1a56d..0000000
--- a/tests/test_kin_126_regression.py
+++ /dev/null
@@ -1,108 +0,0 @@
-"""Regression tests for KIN-126 — фильтр по дате выполнения задач.
-
-Проверяет backend-поведение:
-1. Колонка completed_at добавляется в таблицу tasks при инициализации БД
-2. Новая задача имеет completed_at=None по умолчанию
-3. update_task(status='done') устанавливает completed_at как ISO-строку
-4. update_task(status='done') — completed_at является валидной ISO-строкой
-5. update_task(status='in_progress') не устанавливает completed_at
-6. update_task(status='cancelled') не устанавливает completed_at
-7. Обновление полей без смены статуса на done не трогает completed_at
-8. update_task(status='blocked') не устанавливает completed_at
-"""
-
-import pytest
-from datetime import datetime
-from core.db import init_db
-from core import models
-
-
-@pytest.fixture
-def conn():
-    """Fresh in-memory DB for each test."""
-    c = init_db(db_path=":memory:")
-    yield c
-    c.close()
-
-
-# ---------------------------------------------------------------------------
-# Schema
-# ---------------------------------------------------------------------------
-
-def test_schema_tasks_has_completed_at_column(conn):
-    """KIN-126: таблица tasks содержит колонку completed_at после инициализации БД."""
-    cols = {r[1] for r in conn.execute("PRAGMA table_info(tasks)").fetchall()}
-    assert "completed_at" in cols, "KIN-126: колонка completed_at должна быть в таблице tasks"
-
-
-# ---------------------------------------------------------------------------
-# Default value
-# ---------------------------------------------------------------------------
-
-def test_new_task_completed_at_is_null(conn):
-    """KIN-126: новая задача имеет completed_at=None по умолчанию."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    t = models.create_task(conn, "P1-001", "p1", "Task")
-    assert t["completed_at"] is None
-
-
-# ---------------------------------------------------------------------------
-# Setting completed_at on status='done'
-# ---------------------------------------------------------------------------
-
-def test_update_task_to_done_sets_completed_at(conn):
-    """KIN-126: update_task(status='done') устанавливает completed_at."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", status="done")
-    assert updated["completed_at"] is not None
-
-
-def test_update_task_to_done_completed_at_is_valid_iso(conn):
-    """KIN-126: completed_at при status='done' — валидная ISO-строка datetime."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", status="done")
-    # Must parse without exception
-    parsed = datetime.fromisoformat(updated["completed_at"])
-    assert parsed is not None
-
-
-# ---------------------------------------------------------------------------
-# Non-done statuses do NOT set completed_at
-# ---------------------------------------------------------------------------
-
-def test_update_task_to_in_progress_does_not_set_completed_at(conn):
-    """KIN-126: update_task(status='in_progress') не устанавливает completed_at."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", status="in_progress")
-    assert updated["completed_at"] is None
-
-
-def test_update_task_to_cancelled_does_not_set_completed_at(conn):
-    """KIN-126: update_task(status='cancelled') не устанавливает completed_at."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", status="cancelled")
-    assert updated["completed_at"] is None
-
-
-def test_update_task_to_blocked_does_not_set_completed_at(conn):
-    """KIN-126: update_task(status='blocked') не устанавливает completed_at."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", status="blocked")
-    assert updated["completed_at"] is None
-
-
-# ---------------------------------------------------------------------------
-# Non-status updates do NOT touch completed_at
-# ---------------------------------------------------------------------------
-
-def test_update_task_priority_only_does_not_set_completed_at(conn):
-    """KIN-126: update_task с изменением только priority не трогает completed_at."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    models.create_task(conn, "P1-001", "p1", "Task")
-    updated = models.update_task(conn, "P1-001", priority=1)
-    assert updated["completed_at"] is None
diff --git a/web/frontend/src/__tests__/date-filter.test.ts b/web/frontend/src/__tests__/date-filter.test.ts
deleted file mode 100644
index 869308a..0000000
--- a/web/frontend/src/__tests__/date-filter.test.ts
+++ /dev/null
@@ -1,283 +0,0 @@
-/**
- * KIN-126: Тесты фильтра по дате выполнения задач (done tasks date range filter)
- *
- * AC: фильтр сделан и работает
- *
- * Проверяет:
- * 1. Date filter inputs отображаются только когда выбран статус 'done'
- * 2. Date filter inputs скрыты на других статусах
- * 3. Date filter inputs скрыты без фильтра статуса
- * 4. Фильтрация по dateFrom — задачи до этой даты исключаются
- * 5. Фильтрация по dateTo — задачи после этой даты исключаются
- * 6. Пустой результат при несовпадении дат
- * 7. Сброс фильтра (кнопка ✕) показывает все done-задачи снова
- * 8. Fallback на updated_at когда completed_at=null
- */
-
-import { describe, it, expect, vi, beforeEach } from 'vitest'
-import { mount, flushPromises } from '@vue/test-utils'
-import { createRouter, createMemoryHistory } from 'vue-router'
-import ProjectView from '../views/ProjectView.vue'
-
-vi.mock('../api', () => ({
-  api: {
-    project: vi.fn(),
-    taskFull: vi.fn(),
-    runTask: vi.fn(),
-    auditProject: vi.fn(),
-    createTask: vi.fn(),
-    patchTask: vi.fn(),
-    patchProject: vi.fn(),
-    deployProject: vi.fn(),
-  },
-}))
-
-import { api } from '../api'
-
-const Stub = { template: '<div />' }
-
-function makeTask(
-  id: string,
-  status: string,
-  completedAt: string | null,
-  updatedAt = '2024-01-10T00:00:00',
-) {
-  return {
-    id,
-    project_id: 'KIN',
-    title: `Task ${id}`,
-    status,
-    priority: 5,
-    assigned_role: null,
-    parent_task_id: null,
-    brief: null,
-    spec: null,
-    created_at: '2024-01-01T00:00:00',
-    updated_at: updatedAt,
-    completed_at: completedAt,
-  }
-}
-
-const MOCK_PROJECT_DATE_FILTER = {
-  id: 'KIN',
-  name: 'Kin',
-  path: '/projects/kin',
-  status: 'active',
-  priority: 5,
-  tech_stack: ['python', 'vue'],
-  created_at: '2024-01-01',
-  total_tasks: 4,
-  done_tasks: 3,
-  active_tasks: 1,
-  blocked_tasks: 0,
-  review_tasks: 0,
-  tasks: [
-    makeTask('KIN-001', 'done', '2024-01-05T12:00:00'),  // before range
-    makeTask('KIN-002', 'done', '2024-01-15T12:00:00'),  // in middle
-    makeTask('KIN-003', 'done', '2024-01-25T12:00:00'),  // after range
-    makeTask('KIN-004', 'pending', null),
-  ],
-  decisions: [],
-  modules: [],
-}
-
-function makeRouter() {
-  return createRouter({
-    history: createMemoryHistory(),
-    routes: [
-      { path: '/', component: Stub },
-      { path: '/project/:id', component: ProjectView, props: true },
-    ],
-  })
-}
-
-const localStorageMock = (() => {
-  let store: Record<string, string> = {}
-  return {
-    getItem: (k: string) => store[k] ?? null,
-    setItem: (k: string, v: string) => { store[k] = v },
-    removeItem: (k: string) => { delete store[k] },
-    clear: () => { store = {} },
-  }
-})()
-Object.defineProperty(globalThis, 'localStorage', { value: localStorageMock, configurable: true })
-
-beforeEach(() => {
-  localStorageMock.clear()
-  vi.mocked(api.project).mockResolvedValue(MOCK_PROJECT_DATE_FILTER as any)
-})
-
-describe('KIN-126: фильтр по дате выполнения задач', () => {
-  it('1. Date filter inputs отображаются когда выбран статус done', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    expect(
-      wrapper.find('[data-testid="date-from"]').exists(),
-      'date-from должен быть виден при status=done',
-    ).toBe(true)
-    expect(
-      wrapper.find('[data-testid="date-to"]').exists(),
-      'date-to должен быть виден при status=done',
-    ).toBe(true)
-  })
-
-  it('2. Date filter inputs скрыты когда done не выбран', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=pending')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    expect(
-      wrapper.find('[data-testid="date-from"]').exists(),
-      'date-from не должен быть виден при status=pending',
-    ).toBe(false)
-    expect(
-      wrapper.find('[data-testid="date-to"]').exists(),
-      'date-to не должен быть виден при status=pending',
-    ).toBe(false)
-  })
-
-  it('3. Date filter inputs скрыты без фильтра статуса', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    expect(
-      wrapper.find('[data-testid="date-from"]').exists(),
-      'date-from не должен быть виден без фильтра статуса',
-    ).toBe(false)
-  })
-
-  it('4. Фильтрация по dateFrom исключает задачи выполненные до этой даты', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    await wrapper.find('[data-testid="date-from"]').setValue('2024-01-10')
-    await flushPromises()
-
-    const links = wrapper.findAll('a[href^="/task/"]')
-    const ids = links.map(l => l.attributes('href')?.replace('/task/', '').split('?')[0])
-
-    expect(ids, 'KIN-001 (2024-01-05) должен быть исключён').not.toContain('KIN-001')
-    expect(ids, 'KIN-002 (2024-01-15) должен быть виден').toContain('KIN-002')
-    expect(ids, 'KIN-003 (2024-01-25) должен быть виден').toContain('KIN-003')
-  })
-
-  it('5. Фильтрация по dateTo исключает задачи выполненные после этой даты', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    await wrapper.find('[data-testid="date-to"]').setValue('2024-01-20')
-    await flushPromises()
-
-    const links = wrapper.findAll('a[href^="/task/"]')
-    const ids = links.map(l => l.attributes('href')?.replace('/task/', '').split('?')[0])
-
-    expect(ids, 'KIN-003 (2024-01-25) должен быть исключён').not.toContain('KIN-003')
-    expect(ids, 'KIN-001 (2024-01-05) должен быть виден').toContain('KIN-001')
-    expect(ids, 'KIN-002 (2024-01-15) должен быть виден').toContain('KIN-002')
-  })
-
-  it('6. Пустой результат когда ни одна задача не попадает в диапазон дат', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    await wrapper.find('[data-testid="date-from"]').setValue('2024-02-01')
-    await wrapper.find('[data-testid="date-to"]').setValue('2024-02-28')
-    await flushPromises()
-
-    const links = wrapper.findAll('a[href^="/task/"]')
-    expect(links, 'Ни одна done-задача не должна отображаться при несовпадении дат').toHaveLength(0)
-  })
-
-  it('7. Клик по кнопке сброса очищает фильтр и показывает все done-задачи', async () => {
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    // Устанавливаем dateFrom — остаётся только одна done-задача
-    await wrapper.find('[data-testid="date-from"]').setValue('2024-01-20')
-    await flushPromises()
-    expect(wrapper.findAll('a[href^="/task/"]')).toHaveLength(1)
-
-    // Кнопка сброса — ✕ без data-action (не clear-status)
-    const resetBtn = wrapper.findAll('button').find(
-      b => b.text() === '✕' && !b.attributes('data-action'),
-    )
-    expect(resetBtn?.exists(), 'Кнопка сброса дат должна появиться').toBe(true)
-    await resetBtn!.trigger('click')
-    await flushPromises()
-
-    // После сброса — все 3 done-задачи видны
-    expect(wrapper.findAll('a[href^="/task/"]')).toHaveLength(3)
-  })
-
-  it('8. Fallback на updated_at когда completed_at=null', async () => {
-    const projectWithNullCompletedAt = {
-      ...MOCK_PROJECT_DATE_FILTER,
-      tasks: [
-        makeTask('KIN-010', 'done', null, '2024-01-05T00:00:00'),  // updated_at early
-        makeTask('KIN-011', 'done', null, '2024-01-25T00:00:00'),  // updated_at late
-      ],
-    }
-    vi.mocked(api.project).mockResolvedValue(projectWithNullCompletedAt as any)
-
-    const router = makeRouter()
-    await router.push('/project/KIN?status=done')
-
-    const wrapper = mount(ProjectView, {
-      props: { id: 'KIN' },
-      global: { plugins: [router] },
-    })
-    await flushPromises()
-
-    // dateFrom='2024-01-20' → KIN-010 (updated_at 2024-01-05) должен быть исключён
-    await wrapper.find('[data-testid="date-from"]').setValue('2024-01-20')
-    await flushPromises()
-
-    const links = wrapper.findAll('a[href^="/task/"]')
-    const ids = links.map(l => l.attributes('href')?.replace('/task/', '').split('?')[0])
-
-    expect(ids, 'KIN-010 должен быть исключён (updated_at до dateFrom)').not.toContain('KIN-010')
-    expect(ids, 'KIN-011 должен быть виден (updated_at после dateFrom)').toContain('KIN-011')
-  })
-})
diff --git a/web/frontend/src/api.ts b/web/frontend/src/api.ts
index fe44d66..97c6fe5 100644
--- a/web/frontend/src/api.ts
+++ b/web/frontend/src/api.ts
@@ -122,7 +122,6 @@ export interface Task {
   feedback?: string | null
   created_at: string
   updated_at: string
-  completed_at?: string | null
 }
 
 export interface Decision {
diff --git a/web/frontend/src/locales/en.json b/web/frontend/src/locales/en.json
index a3eab4f..9a8724b 100644
--- a/web/frontend/src/locales/en.json
+++ b/web/frontend/src/locales/en.json
@@ -221,9 +221,7 @@
     "settings_integrations_section": "Integrations",
     "settings_execution_mode": "Execution mode",
     "settings_autocommit": "Autocommit",
-    "settings_autocommit_hint": "— git commit after pipeline",
-    "done_date_from": "From",
-    "done_date_to": "To"
+    "settings_autocommit_hint": "— git commit after pipeline"
   },
   "escalation": {
     "watchdog_blocked": "Watchdog: task {task_id} blocked — {reason}",
diff --git a/web/frontend/src/locales/ru.json b/web/frontend/src/locales/ru.json
index 81c72e6..0eff34b 100644
--- a/web/frontend/src/locales/ru.json
+++ b/web/frontend/src/locales/ru.json
@@ -221,9 +221,7 @@
     "settings_integrations_section": "Интеграции",
     "settings_execution_mode": "Режим выполнения",
     "settings_autocommit": "Автокоммит",
-    "settings_autocommit_hint": "— git commit после pipeline",
-    "done_date_from": "От",
-    "done_date_to": "До"
+    "settings_autocommit_hint": "— git commit после pipeline"
   },
   "escalation": {
     "watchdog_blocked": "Watchdog: задача {task_id} заблокирована — {reason}",
diff --git a/web/frontend/src/views/ProjectView.vue b/web/frontend/src/views/ProjectView.vue
index 5f13d48..46051f8 100644
--- a/web/frontend/src/views/ProjectView.vue
+++ b/web/frontend/src/views/ProjectView.vue
@@ -186,8 +186,6 @@ function initStatusFilter(): string[] {
 const selectedStatuses = ref<string[]>(initStatusFilter())
 const selectedCategory = ref('')
 const taskSearch = ref('')
-const dateFrom = ref('')
-const dateTo = ref('')
 
 function toggleStatus(s: string) {
   const idx = selectedStatuses.value.indexOf(s)
@@ -661,16 +659,6 @@ const filteredTasks = computed(() => {
   let tasks = searchFilteredTasks.value
   if (selectedStatuses.value.length > 0) tasks = tasks.filter(t => selectedStatuses.value.includes(t.status))
   if (selectedCategory.value) tasks = tasks.filter(t => t.category === selectedCategory.value)
-  if ((dateFrom.value || dateTo.value) && selectedStatuses.value.includes('done')) {
-    tasks = tasks.filter(t => {
-      if (t.status !== 'done') return true
-      const dateStr = (t.completed_at || t.updated_at) ?? ''
-      const d = dateStr.substring(0, 10)
-      if (dateFrom.value && d < dateFrom.value) return false
-      if (dateTo.value && d > dateTo.value) return false
-      return true
-    })
-  }
   return tasks
 })
 
@@ -1089,17 +1077,6 @@ async function addDecision() {
           <button v-if="taskSearch" @click="taskSearch = ''"
             class="text-gray-600 hover:text-red-400 text-xs px-1">✕</button>
         </div>
-        <!-- Date filter for done tasks -->
-        <div v-if="selectedStatuses.includes('done')" class="flex items-center gap-2">
-          <span class="text-xs text-gray-600">{{ t('projectView.done_date_from') }}</span>
-          <input type="date" v-model="dateFrom" data-testid="date-from"
-            class="bg-gray-800 border border-gray-700 rounded px-2 py-0.5 text-xs text-gray-300 focus:border-gray-500 outline-none" />
-          <span class="text-xs text-gray-600">{{ t('projectView.done_date_to') }}</span>
-          <input type="date" v-model="dateTo" data-testid="date-to"
-            class="bg-gray-800 border border-gray-700 rounded px-2 py-0.5 text-xs text-gray-300 focus:border-gray-500 outline-none" />
-          <button v-if="dateFrom || dateTo" @click="dateFrom = ''; dateTo = ''"
-            class="text-gray-600 hover:text-red-400 text-xs px-1">✕</button>
-        </div>
       </div>
       <!-- Manual escalation tasks -->
       <div v-if="manualEscalationTasks.length" class="mb-4">