diff --git a/core/models.py b/core/models.py
index dde8f65..62587a6 100644
--- a/core/models.py
+++ b/core/models.py
@@ -266,28 +266,12 @@ def get_task(conn: sqlite3.Connection, id: str) -> dict | None:
     return _row_to_dict(row)
 
 
-VALID_TASK_SORT_FIELDS = frozenset({
-    "updated_at", "created_at", "priority", "status", "title", "id",
-})
-
-
 def list_tasks(
     conn: sqlite3.Connection,
     project_id: str | None = None,
     status: str | None = None,
-    limit: int | None = None,
-    sort: str = "updated_at",
-    sort_dir: str = "desc",
 ) -> list[dict]:
-    """List tasks with optional project/status filters, limit, and sort.
-
-    sort: column name (validated against VALID_TASK_SORT_FIELDS, default 'updated_at')
-    sort_dir: 'asc' or 'desc' (default 'desc')
-    """
-    # Validate sort field to prevent SQL injection
-    sort_col = sort if sort in VALID_TASK_SORT_FIELDS else "updated_at"
-    sort_direction = "DESC" if sort_dir.lower() != "asc" else "ASC"
-
+    """List tasks with optional project/status filters."""
     query = "SELECT * FROM tasks WHERE 1=1"
     params: list = []
     if project_id:
@@ -296,10 +280,7 @@ def list_tasks(
     if status:
         query += " AND status = ?"
         params.append(status)
-    query += f" ORDER BY {sort_col} {sort_direction}"
-    if limit is not None:
-        query += " LIMIT ?"
-        params.append(limit)
+    query += " ORDER BY priority, created_at"
     return _rows_to_list(conn.execute(query, params).fetchall())
 
 
diff --git a/tests/test_kin_ui_015_regression.py b/tests/test_kin_ui_015_regression.py
deleted file mode 100644
index e05872e..0000000
--- a/tests/test_kin_ui_015_regression.py
+++ /dev/null
@@ -1,139 +0,0 @@
-"""Regression tests for KIN-UI-015 — GET /api/tasks endpoint.
-
-New endpoint: GET /api/tasks?status=...&limit=...&sort=...
-Acceptance criteria:
-- Эндпоинт существует и возвращает корректные данные
-- Фильтрация по status работает корректно
-- Параметр limit ограничивает количество результатов
-- Параметр sort задаёт порядок сортировки
-- Невалидный sort-field фоллбэчит на updated_at (защита от SQL-инъекций)
-
-Coverage:
-(1) GET /api/tasks возвращает все задачи проекта
-(2) GET /api/tasks?status=completed возвращает только completed
-(3) GET /api/tasks?status=completed не возвращает задачи с другим статусом
-(4) GET /api/tasks?limit=1 возвращает не более 1 результата
-(5) GET /api/tasks?sort=priority — сортировка по priority работает
-(6) GET /api/tasks?sort=invalid_field — фоллбэк на updated_at (нет 500-ошибки)
-(7) GET /api/tasks?status=completed&limit=20&sort=updated_at — все параметры вместе
-(8) GET /api/tasks возвращает 200 при пустой базе
-"""
-
-import pytest
-import web.api as api_module
-from fastapi.testclient import TestClient
-from core.db import init_db
-from core import models
-
-
-@pytest.fixture
-def client(tmp_path):
-    db_path = tmp_path / "test.db"
-    api_module.DB_PATH = db_path
-    from web.api import app
-    c = TestClient(app)
-    c.post("/api/projects", json={"id": "p1", "name": "P1", "path": "/tmp/p1"})
-    return c
-
-
-@pytest.fixture
-def client_with_tasks(client, tmp_path):
-    """Client pre-seeded with tasks of various statuses."""
-    conn = init_db(api_module.DB_PATH)
-    models.create_task(conn, "P1-001", "p1", "Pending task", status="pending")
-    models.create_task(conn, "P1-002", "p1", "Completed task 1", status="completed")
-    models.create_task(conn, "P1-003", "p1", "Completed task 2", status="completed")
-    models.create_task(conn, "P1-004", "p1", "In-progress task", status="in_progress")
-    conn.close()
-    return client
-
-
-# ---------------------------------------------------------------------------
-# (1) GET /api/tasks возвращает все задачи
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_returns_all(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 4
-
-
-# ---------------------------------------------------------------------------
-# (2) GET /api/tasks?status=completed возвращает только completed
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_filter_by_status_completed(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?status=completed")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 2
-    assert all(t["status"] == "completed" for t in tasks)
-
-
-# ---------------------------------------------------------------------------
-# (3) Другие статусы не попадают в фильтр status=completed
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_filter_excludes_other_statuses(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?status=completed")
-    assert r.status_code == 200
-    tasks = r.json()
-    titles = [t["title"] for t in tasks]
-    assert "Pending task" not in titles
-    assert "In-progress task" not in titles
-
-
-# ---------------------------------------------------------------------------
-# (4) GET /api/tasks?limit=1 возвращает не более 1 результата
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_limit_respected(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?limit=1")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 1
-
-
-# ---------------------------------------------------------------------------
-# (5) GET /api/tasks?sort=priority — сортировка работает (нет 500-ошибки)
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_sort_by_priority(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?sort=priority")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 4
-
-
-# ---------------------------------------------------------------------------
-# (6) Невалидный sort-field фоллбэчит на updated_at (нет 500-ошибки)
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_invalid_sort_falls_back(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?sort='; DROP TABLE tasks; --")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert isinstance(tasks, list)
-
-
-# ---------------------------------------------------------------------------
-# (7) Все параметры вместе: status=completed&limit=20&sort=updated_at
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_combined_params(client_with_tasks):
-    r = client_with_tasks.get("/api/tasks?status=completed&limit=20&sort=updated_at")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 2
-    assert all(t["status"] == "completed" for t in tasks)
-
-
-# ---------------------------------------------------------------------------
-# (8) Пустая база — возвращает 200 и пустой список
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_empty_db(client):
-    r = client.get("/api/tasks")
-    assert r.status_code == 200
-    assert r.json() == []
diff --git a/web/api.py b/web/api.py
index c788acd..adc169d 100644
--- a/web/api.py
+++ b/web/api.py
@@ -654,28 +654,6 @@ def start_project_phase(project_id: str):
 # Tasks
 # ---------------------------------------------------------------------------
 
-@app.get("/api/tasks")
-def list_tasks(
-    status: str | None = Query(default=None),
-    limit: int = Query(default=20, ge=1, le=500),
-    sort: str = Query(default="updated_at"),
-    project_id: str | None = Query(default=None),
-):
-    """List tasks with optional filters. sort defaults to updated_at desc."""
-    from core.models import VALID_TASK_SORT_FIELDS
-    conn = get_conn()
-    tasks = models.list_tasks(
-        conn,
-        project_id=project_id,
-        status=status,
-        limit=limit,
-        sort=sort if sort in VALID_TASK_SORT_FIELDS else "updated_at",
-        sort_dir="desc",
-    )
-    conn.close()
-    return tasks
-
-
 @app.get("/api/tasks/{task_id}")
 def get_task(task_id: str):
     conn = get_conn()
diff --git a/web/frontend/src/__tests__/completed-tasks-banner.test.ts b/web/frontend/src/__tests__/completed-tasks-banner.test.ts
index 7b35975..a71c160 100644
--- a/web/frontend/src/__tests__/completed-tasks-banner.test.ts
+++ b/web/frontend/src/__tests__/completed-tasks-banner.test.ts
@@ -19,7 +19,8 @@ vi.mock('vue-router', () => ({
 vi.mock('../api', () => ({
   api: {
     notifications: vi.fn(),
-    listTasks: vi.fn(),
+    projects: vi.fn(),
+    project: vi.fn(),
     reviseTask: vi.fn(),
   },
 }))
@@ -37,6 +38,40 @@ const localStorageMock = (() => {
 })()
 Object.defineProperty(globalThis, 'localStorage', { value: localStorageMock, configurable: true })
 
+function makeProject(id = 'proj-1', name = 'MyProject', doneCount = 1) {
+  return {
+    id,
+    name,
+    path: '/projects/test',
+    status: 'active',
+    priority: 1,
+    tech_stack: ['python'],
+    execution_mode: null,
+    autocommit_enabled: null,
+    auto_test_enabled: null,
+    worktrees_enabled: null,
+    obsidian_vault_path: null,
+    deploy_command: null,
+    test_command: null,
+    deploy_host: null,
+    deploy_path: null,
+    deploy_runtime: null,
+    deploy_restart_cmd: null,
+    created_at: '2024-01-01',
+    total_tasks: doneCount,
+    done_tasks: doneCount,
+    active_tasks: 0,
+    blocked_tasks: 0,
+    review_tasks: 0,
+    project_type: null,
+    ssh_host: null,
+    ssh_user: null,
+    ssh_key_path: null,
+    ssh_proxy_jump: null,
+    description: null,
+  }
+}
+
 function makeCompletedTask(id = 'TSK-1', title = 'Test task') {
   return {
     id,
@@ -58,13 +93,21 @@ function makeCompletedTask(id = 'TSK-1', title = 'Test task') {
   }
 }
 
+function makeProjectDetail(
+  project: ReturnType<typeof makeProject>,
+  tasks: ReturnType<typeof makeCompletedTask>[],
+) {
+  return { ...project, tasks, modules: [], decisions: [] }
+}
+
 beforeEach(() => {
   localStorageMock.clear()
   vi.clearAllMocks()
   mockPush.mockClear()
   vi.useFakeTimers()
   vi.mocked(api.notifications).mockResolvedValue([])
-  vi.mocked(api.listTasks).mockResolvedValue([])
+  vi.mocked(api.projects).mockResolvedValue([])
+  vi.mocked(api.project).mockResolvedValue(makeProjectDetail(makeProject(), []))
   vi.mocked(api.reviseTask).mockResolvedValue({ status: 'ok', comment: '' })
 })
 
@@ -73,8 +116,13 @@ afterEach(() => {
   vi.restoreAllMocks()
 })
 
-async function mountWithCompleted(tasks = [makeCompletedTask()]) {
-  vi.mocked(api.listTasks).mockResolvedValue(tasks)
+async function mountWithCompleted(
+  tasks = [makeCompletedTask()],
+  projectName = 'MyProject',
+) {
+  const project = makeProject('proj-1', projectName)
+  vi.mocked(api.projects).mockResolvedValue([project])
+  vi.mocked(api.project).mockResolvedValue(makeProjectDetail(project, tasks))
   const wrapper = mount(EscalationBanner)
   await flushPromises()
   return wrapper
@@ -110,7 +158,7 @@ describe('KIN-125 AC1: завершённые задачи отображают
   })
 
   it('Бейдж не отображается когда нет завершённых задач', async () => {
-    vi.mocked(api.listTasks).mockResolvedValue([])
+    vi.mocked(api.projects).mockResolvedValue([makeProject('proj-1', 'P', 0)])
     const wrapper = mount(EscalationBanner)
     await flushPromises()
     const badge = wrapper.findAll('button').find(b => b.text().includes('Completed'))
diff --git a/web/frontend/src/api.ts b/web/frontend/src/api.ts
index 97c6fe5..b446172 100644
--- a/web/frontend/src/api.ts
+++ b/web/frontend/src/api.ts
@@ -410,11 +410,6 @@ export const api = {
   deleteAttachment: (taskId: string, id: number) =>
     del<void>(`/tasks/${taskId}/attachments/${id}`),
   attachmentUrl: (id: number) => `${BASE}/attachments/${id}/file`,
-  listTasks: (status?: string, limit = 20, sort = 'updated_at') => {
-    const q = new URLSearchParams({ limit: String(limit), sort })
-    if (status) q.set('status', status)
-    return get<Task[]>(`/tasks?${q.toString()}`)
-  },
   getPipelineLogs: (pipelineId: string, sinceId: number) =>
     get<PipelineLog[]>(`/pipelines/${pipelineId}/logs?since_id=${sinceId}`),
   projectLinks: (projectId: string) =>
diff --git a/web/frontend/src/components/EscalationBanner.vue b/web/frontend/src/components/EscalationBanner.vue
index 043f0ba..04a78cb 100644
--- a/web/frontend/src/components/EscalationBanner.vue
+++ b/web/frontend/src/components/EscalationBanner.vue
@@ -148,8 +148,24 @@ const visibleCompleted = computed(() =>
 
 async function loadCompletedTasks() {
   try {
-    const tasks = await api.listTasks('completed', 20, 'updated_at')
-    completedTasks.value = tasks.map(t => ({ ...t, project_name: t.project_id }))
+    const projects = await api.projects()
+    const withCompleted = projects.filter(p => p.done_tasks > 0)
+    if (withCompleted.length === 0) {
+      completedTasks.value = []
+      return
+    }
+    const details = await Promise.all(withCompleted.map(p => api.project(p.id)))
+    const results: CompletedTaskItem[] = []
+    for (let i = 0; i < details.length; i++) {
+      const projectName = withCompleted[i].name
+      for (const task of details[i].tasks) {
+        if (task.status === 'completed') {
+          results.push({ ...task, project_name: projectName })
+        }
+      }
+    }
+    results.sort((a, b) => new Date(b.updated_at).getTime() - new Date(a.updated_at).getTime())
+    completedTasks.value = results.slice(0, 20)
   } catch {
     // silent
   }