diff --git a/core/models.py b/core/models.py
index b21b1af..6d004f3 100644
--- a/core/models.py
+++ b/core/models.py
@@ -13,7 +13,7 @@ from typing import Any
 
 VALID_TASK_STATUSES = [
     "pending", "in_progress", "review", "done",
-    "blocked", "decomposed", "cancelled", "revising",
+    "blocked", "decomposed", "cancelled",
 ]
 
 VALID_COMPLETION_MODES = {"auto_complete", "review"}
@@ -266,48 +266,6 @@ def get_task(conn: sqlite3.Connection, id: str) -> dict | None:
     return _row_to_dict(row)
 
 
-def get_children(conn: sqlite3.Connection, task_id: str) -> list[dict]:
-    """Return direct child tasks of given task_id."""
-    rows = conn.execute(
-        "SELECT * FROM tasks WHERE parent_task_id = ?", (task_id,)
-    ).fetchall()
-    return _rows_to_list(rows)
-
-
-def has_open_children(conn: sqlite3.Connection, task_id: str) -> bool:
-    """Recursively check if task has any open (not done/cancelled) descendants."""
-    children = get_children(conn, task_id)
-    for child in children:
-        if child["status"] not in ("done", "cancelled"):
-            return True
-        if has_open_children(conn, child["id"]):
-            return True
-    return False
-
-
-def _check_parent_completion(conn: sqlite3.Connection, task_id: str) -> None:
-    """Cascade-check upward: if parent is 'revising' and all children closed → promote to 'done'."""
-    task = get_task(conn, task_id)
-    if not task:
-        return
-    parent_id = task.get("parent_task_id")
-    if not parent_id:
-        return
-    parent = get_task(conn, parent_id)
-    if not parent:
-        return
-    if parent["status"] != "revising":
-        return
-    if not has_open_children(conn, parent_id):
-        now = datetime.now().isoformat()
-        conn.execute(
-            "UPDATE tasks SET status = 'done', completed_at = ?, updated_at = ? WHERE id = ?",
-            (now, now, parent_id),
-        )
-        conn.commit()
-        _check_parent_completion(conn, parent_id)
-
-
 VALID_TASK_SORT_FIELDS = frozenset({
     "updated_at", "created_at", "priority", "status", "title", "id",
 })
@@ -317,16 +275,14 @@ def list_tasks(
     conn: sqlite3.Connection,
     project_id: str | None = None,
     status: str | None = None,
-    parent_task_id: str | None = None,
     limit: int | None = None,
     sort: str = "updated_at",
     sort_dir: str = "desc",
 ) -> list[dict]:
-    """List tasks with optional project/status/parent filters, limit, and sort.
+    """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')
-    parent_task_id: filter by parent task id (pass '__none__' to get root tasks)
     """
     # Validate sort field to prevent SQL injection
     sort_col = sort if sort in VALID_TASK_SORT_FIELDS else "updated_at"
@@ -340,11 +296,6 @@ def list_tasks(
     if status:
         query += " AND status = ?"
         params.append(status)
-    if parent_task_id == "__none__":
-        query += " AND parent_task_id IS NULL"
-    elif parent_task_id:
-        query += " AND parent_task_id = ?"
-        params.append(parent_task_id)
     query += f" ORDER BY {sort_col} {sort_direction}"
     if limit is not None:
         query += " LIMIT ?"
@@ -353,11 +304,7 @@ 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'.
-
-    If transitioning to 'done' but task has open children, sets 'revising' instead.
-    After a child closes (done/cancelled), cascades upward to promote revising parents.
-    """
+    """Update task fields. Auto-sets updated_at. Sets completed_at when status transitions to 'done'."""
     if not fields:
         return get_task(conn, id)
     json_cols = ("brief", "spec", "review", "test_result", "security_result", "labels")
@@ -365,20 +312,12 @@ def update_task(conn: sqlite3.Connection, id: str, **fields) -> dict:
         if key in fields:
             fields[key] = _json_encode(fields[key])
     if "status" in fields and fields["status"] == "done":
-        if has_open_children(conn, id):
-            fields["status"] = "revising"
-            # Do NOT set completed_at for revising (Decision #737)
-        else:
-            fields["completed_at"] = datetime.now().isoformat()
+        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]
     conn.execute(f"UPDATE tasks SET {sets} WHERE id = ?", vals)
     conn.commit()
-    # Cascade upward: if this child just closed, maybe its parent can finish
-    new_status = fields.get("status")
-    if new_status in ("done", "cancelled"):
-        _check_parent_completion(conn, id)
     return get_task(conn, id)
 
 
diff --git a/tests/test_revising_status.py b/tests/test_revising_status.py
deleted file mode 100644
index bffa5e7..0000000
--- a/tests/test_revising_status.py
+++ /dev/null
@@ -1,329 +0,0 @@
-"""Tests for KIN-127: 'revising' status and recursive child completion blocking.
-
-Covers:
-- VALID_TASK_STATUSES contains 'revising'
-- update_task → done redirects to 'revising' when open children exist
-- Cascade: child→done triggers parent revising→done
-- completed_at semantics for revising vs real done
-- get_children() and has_open_children()
-- API: PATCH status=done, GET /children, GET ?parent_task_id
-"""
-
-import pytest
-from core.db import init_db
-from core import models
-from unittest.mock import patch
-
-
-# ---------------------------------------------------------------------------
-# Fixtures
-# ---------------------------------------------------------------------------
-
-@pytest.fixture
-def conn():
-    """Fresh in-memory DB for each test."""
-    c = init_db(db_path=":memory:")
-    yield c
-    c.close()
-
-
-@pytest.fixture
-def proj(conn):
-    """DB connection with a seeded project."""
-    models.create_project(conn, "p1", "P1", "/p1")
-    return conn
-
-
-# ---------------------------------------------------------------------------
-# API client fixture (mirrors test_api.py pattern)
-# ---------------------------------------------------------------------------
-
-@pytest.fixture
-def client(tmp_path):
-    import web.api as api_module
-    api_module.DB_PATH = tmp_path / "test.db"
-    from web.api import app
-    from fastapi.testclient import TestClient
-    return TestClient(app)
-
-
-# ===========================================================================
-# 1. VALID_TASK_STATUSES
-# ===========================================================================
-
-def test_revising_in_valid_statuses():
-    """'revising' должен присутствовать в VALID_TASK_STATUSES."""
-    assert "revising" in models.VALID_TASK_STATUSES
-
-
-# ===========================================================================
-# 2. update_task: done → revising when open children exist
-# ===========================================================================
-
-def test_done_with_open_children_becomes_revising(proj):
-    """Попытка parent→done при открытом child возвращает status='revising'."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="pending")
-
-    result = models.update_task(proj, "P1-001", status="done")
-
-    assert result["status"] == "revising"
-
-
-def test_done_without_children_stays_done(proj):
-    """Задача без детей переходит в 'done' без изменений."""
-    models.create_task(proj, "P1-001", "p1", "Task")
-
-    result = models.update_task(proj, "P1-001", status="done")
-
-    assert result["status"] == "done"
-
-
-def test_done_with_all_children_done(proj):
-    """Все дети завершены → parent→done проходит как обычно."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child A", parent_task_id="P1-001", status="done")
-    models.create_task(proj, "P1-001b", "p1", "Child B", parent_task_id="P1-001", status="done")
-
-    result = models.update_task(proj, "P1-001", status="done")
-
-    assert result["status"] == "done"
-
-
-def test_done_with_cancelled_children(proj):
-    """Дети со статусом 'cancelled' считаются закрытыми → parent→done разрешён."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child A", parent_task_id="P1-001", status="cancelled")
-    models.create_task(proj, "P1-001b", "p1", "Child B", parent_task_id="P1-001", status="done")
-
-    result = models.update_task(proj, "P1-001", status="done")
-
-    assert result["status"] == "done"
-
-
-# ===========================================================================
-# 3. Cascade: child→done → parent revising→done
-# ===========================================================================
-
-def test_cascade_parent_completion(proj):
-    """child→done автоматически переводит parent из 'revising' в 'done'."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="pending")
-
-    # parent→done с открытым ребёнком → revising
-    models.update_task(proj, "P1-001", status="done")
-    assert models.get_task(proj, "P1-001")["status"] == "revising"
-
-    # child→done → каскад поднимает parent в done
-    models.update_task(proj, "P1-001a", status="done")
-    assert models.get_task(proj, "P1-001")["status"] == "done"
-
-
-def test_deep_cascade(proj):
-    """3 уровня: grandchild→done → child (revising)→done → parent (revising)→done."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="pending")
-    models.create_task(proj, "P1-001a1", "p1", "Grandchild", parent_task_id="P1-001a", status="pending")
-
-    # parent→done → revising (есть открытый child, у child открытый grandchild)
-    models.update_task(proj, "P1-001", status="done")
-    assert models.get_task(proj, "P1-001")["status"] == "revising"
-
-    # child→done → revising (есть открытый grandchild)
-    models.update_task(proj, "P1-001a", status="done")
-    assert models.get_task(proj, "P1-001a")["status"] == "revising"
-    # parent остаётся revising
-    assert models.get_task(proj, "P1-001")["status"] == "revising"
-
-    # grandchild→done → cascades: child→done, parent→done
-    models.update_task(proj, "P1-001a1", status="done")
-    assert models.get_task(proj, "P1-001a1")["status"] == "done"
-    assert models.get_task(proj, "P1-001a")["status"] == "done"
-    assert models.get_task(proj, "P1-001")["status"] == "done"
-
-
-# ===========================================================================
-# 4. completed_at semantics
-# ===========================================================================
-
-def test_completed_at_not_set_on_revising(proj):
-    """При переходе в 'revising' completed_at должен оставаться NULL."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="pending")
-
-    result = models.update_task(proj, "P1-001", status="done")
-
-    assert result["status"] == "revising"
-    assert result["completed_at"] is None
-
-
-def test_completed_at_set_on_real_done(proj):
-    """При каскадном переходе parent из revising → done ставится completed_at."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="pending")
-
-    models.update_task(proj, "P1-001", status="done")  # → revising
-    models.update_task(proj, "P1-001a", status="done")  # cascade → parent done
-
-    parent = models.get_task(proj, "P1-001")
-    assert parent["status"] == "done"
-    assert parent["completed_at"] is not None
-
-
-# ===========================================================================
-# 5. get_children()
-# ===========================================================================
-
-def test_get_children_returns_direct_children(proj):
-    """get_children возвращает только прямых потомков."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child A", parent_task_id="P1-001")
-    models.create_task(proj, "P1-001b", "p1", "Child B", parent_task_id="P1-001")
-    models.create_task(proj, "P1-001a1", "p1", "Grandchild", parent_task_id="P1-001a")
-
-    children = models.get_children(proj, "P1-001")
-
-    assert len(children) == 2
-    ids = {c["id"] for c in children}
-    assert ids == {"P1-001a", "P1-001b"}
-
-
-def test_get_children_empty_for_leaf_task(proj):
-    """get_children возвращает [] для задачи без детей."""
-    models.create_task(proj, "P1-001", "p1", "Task")
-
-    assert models.get_children(proj, "P1-001") == []
-
-
-# ===========================================================================
-# 6. has_open_children() — recursive
-# ===========================================================================
-
-def test_has_open_children_recursive(proj):
-    """has_open_children рекурсивно проверяет через 3 уровня вложенности."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="done")
-    models.create_task(proj, "P1-001a1", "p1", "Grandchild", parent_task_id="P1-001a", status="pending")
-
-    # Child сам done, но у него открытый grandchild — должен вернуть True
-    assert models.has_open_children(proj, "P1-001") is True
-
-
-def test_has_open_children_false_when_all_closed(proj):
-    """has_open_children возвращает False когда все потомки closed."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001", status="done")
-    models.create_task(proj, "P1-001a1", "p1", "Grandchild", parent_task_id="P1-001a", status="cancelled")
-
-    assert models.has_open_children(proj, "P1-001") is False
-
-
-# ===========================================================================
-# 7. list_tasks — parent_task_id filter
-# ===========================================================================
-
-def test_list_tasks_parent_filter(proj):
-    """list_tasks(parent_task_id=...) возвращает только дочерние задачи."""
-    models.create_task(proj, "P1-001", "p1", "Parent")
-    models.create_task(proj, "P1-001a", "p1", "Child A", parent_task_id="P1-001")
-    models.create_task(proj, "P1-001b", "p1", "Child B", parent_task_id="P1-001")
-    models.create_task(proj, "P1-002", "p1", "Other root task")
-
-    result = models.list_tasks(proj, parent_task_id="P1-001")
-
-    assert len(result) == 2
-    ids = {t["id"] for t in result}
-    assert ids == {"P1-001a", "P1-001b"}
-
-
-def test_list_tasks_parent_none_filter(proj):
-    """list_tasks(parent_task_id='__none__') возвращает только корневые задачи."""
-    models.create_task(proj, "P1-001", "p1", "Root Task")
-    models.create_task(proj, "P1-001a", "p1", "Child", parent_task_id="P1-001")
-
-    result = models.list_tasks(proj, parent_task_id="__none__")
-
-    ids = {t["id"] for t in result}
-    assert "P1-001" in ids
-    assert "P1-001a" not in ids
-
-
-# ===========================================================================
-# 8. API tests
-# ===========================================================================
-
-def test_patch_task_revising_status(client, tmp_path):
-    """PATCH /api/tasks/{id} status=done с открытым child → ответ содержит status='revising'."""
-    import web.api as api_module
-    from core.db import init_db
-    from core import models as m
-
-    client.post("/api/projects", json={"id": "p1", "name": "P1", "path": "/p1"})
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent Task"})
-    parent_id = r.json()["id"]
-
-    # Seed child directly via models (TaskCreate API has no parent_task_id field)
-    conn = init_db(api_module.DB_PATH)
-    m.create_task(conn, parent_id + "a", "p1", "Child Task",
-                  parent_task_id=parent_id, status="pending")
-    conn.close()
-
-    r = client.patch(f"/api/tasks/{parent_id}", json={"status": "done"})
-
-    assert r.status_code == 200
-    assert r.json()["status"] == "revising"
-
-
-def test_get_children_endpoint(client):
-    """GET /api/tasks/{id}/children возвращает список прямых дочерних задач."""
-    import web.api as api_module
-    from core.db import init_db
-    from core import models as m
-
-    client.post("/api/projects", json={"id": "p1", "name": "P1", "path": "/p1"})
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent Task"})
-    parent_id = r.json()["id"]
-
-    # Seed children via models
-    conn = init_db(api_module.DB_PATH)
-    m.create_task(conn, parent_id + "a", "p1", "Child A", parent_task_id=parent_id)
-    m.create_task(conn, parent_id + "b", "p1", "Child B", parent_task_id=parent_id)
-    conn.close()
-
-    r = client.get(f"/api/tasks/{parent_id}/children")
-
-    assert r.status_code == 200
-    children = r.json()
-    assert len(children) == 2
-    titles = {c["title"] for c in children}
-    assert titles == {"Child A", "Child B"}
-
-
-def test_get_children_endpoint_not_found(client):
-    """GET /api/tasks/{id}/children для несуществующей задачи → 404."""
-    r = client.get("/api/tasks/NONEXISTENT/children")
-    assert r.status_code == 404
-
-
-def test_list_tasks_parent_filter_api(client):
-    """GET /api/tasks?parent_task_id={id} фильтрует задачи по родителю."""
-    import web.api as api_module
-    from core.db import init_db
-    from core import models as m
-
-    client.post("/api/projects", json={"id": "p1", "name": "P1", "path": "/p1"})
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent Task"})
-    parent_id = r.json()["id"]
-    client.post("/api/tasks", json={"project_id": "p1", "title": "Other Root Task"})
-
-    # Seed child via models
-    conn = init_db(api_module.DB_PATH)
-    m.create_task(conn, parent_id + "a", "p1", "Child Task", parent_task_id=parent_id)
-    conn.close()
-
-    r = client.get(f"/api/tasks?parent_task_id={parent_id}")
-
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 1
-    assert tasks[0]["title"] == "Child Task"
diff --git a/tests/test_revising_status_regression.py b/tests/test_revising_status_regression.py
deleted file mode 100644
index b092161..0000000
--- a/tests/test_revising_status_regression.py
+++ /dev/null
@@ -1,141 +0,0 @@
-"""Regression tests for KIN-127 bug: parent_task_id silently ignored in POST /api/tasks.
-
-Root cause: TaskCreate schema was missing parent_task_id field, so child tasks
-created via API had no parent link in DB. Fixed by adding parent_task_id to TaskCreate
-and passing it to models.create_task.
-
-These tests use the API end-to-end (no models bypass) to prevent regression.
-"""
-
-import pytest
-
-
-@pytest.fixture
-def client(tmp_path):
-    import web.api as api_module
-    api_module.DB_PATH = tmp_path / "test.db"
-    from web.api import app
-    from fastapi.testclient import TestClient
-    c = TestClient(app)
-    c.post("/api/projects", json={"id": "p1", "name": "P1", "path": "/p1"})
-    return c
-
-
-# ---------------------------------------------------------------------------
-# 1. parent_task_id сохраняется при создании задачи через API
-# ---------------------------------------------------------------------------
-
-def test_create_task_with_parent_task_id_saves_link(client):
-    """POST /api/tasks с parent_task_id — ссылка на родителя сохраняется в БД."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent"})
-    assert r.status_code == 200
-    parent_id = r.json()["id"]
-
-    r = client.post("/api/tasks", json={
-        "project_id": "p1",
-        "title": "Child",
-        "parent_task_id": parent_id,
-    })
-    assert r.status_code == 200
-    child = r.json()
-    assert child["parent_task_id"] == parent_id
-
-
-def test_create_task_without_parent_task_id_has_no_parent(client):
-    """POST /api/tasks без parent_task_id — задача создаётся как корневая."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Root task"})
-    assert r.status_code == 200
-    task = r.json()
-    assert task.get("parent_task_id") is None
-
-
-# ---------------------------------------------------------------------------
-# 2. /children возвращает задачи, созданные через API с parent_task_id
-# ---------------------------------------------------------------------------
-
-def test_children_endpoint_returns_api_created_children(client):
-    """GET /children видит дочерние задачи, созданные через POST /api/tasks."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent"})
-    parent_id = r.json()["id"]
-
-    client.post("/api/tasks", json={
-        "project_id": "p1", "title": "Child A", "parent_task_id": parent_id,
-    })
-    client.post("/api/tasks", json={
-        "project_id": "p1", "title": "Child B", "parent_task_id": parent_id,
-    })
-
-    r = client.get(f"/api/tasks/{parent_id}/children")
-    assert r.status_code == 200
-    titles = {c["title"] for c in r.json()}
-    assert titles == {"Child A", "Child B"}
-
-
-def test_children_endpoint_empty_for_task_created_without_parent(client):
-    """GET /children возвращает [] для задачи без дочерних задач."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Leaf"})
-    task_id = r.json()["id"]
-
-    r = client.get(f"/api/tasks/{task_id}/children")
-    assert r.status_code == 200
-    assert r.json() == []
-
-
-# ---------------------------------------------------------------------------
-# 3. Фильтр ?parent_task_id работает с API-созданными дочерними задачами
-# ---------------------------------------------------------------------------
-
-def test_list_tasks_parent_filter_with_api_created_children(client):
-    """GET /api/tasks?parent_task_id={id} находит задачи, созданные через API."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent"})
-    parent_id = r.json()["id"]
-
-    client.post("/api/tasks", json={
-        "project_id": "p1", "title": "Child", "parent_task_id": parent_id,
-    })
-    client.post("/api/tasks", json={"project_id": "p1", "title": "Other root"})
-
-    r = client.get(f"/api/tasks?parent_task_id={parent_id}")
-    assert r.status_code == 200
-    tasks = r.json()
-    assert len(tasks) == 1
-    assert tasks[0]["title"] == "Child"
-
-
-# ---------------------------------------------------------------------------
-# 4. End-to-end: PATCH status=done → revising, дочерняя задача создана через API
-# ---------------------------------------------------------------------------
-
-def test_patch_done_becomes_revising_when_child_created_via_api(client):
-    """E2E: дочерняя задача создана через POST /api/tasks → parent PATCH done → revising."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent"})
-    parent_id = r.json()["id"]
-
-    client.post("/api/tasks", json={
-        "project_id": "p1",
-        "title": "Child (open)",
-        "parent_task_id": parent_id,
-    })
-
-    r = client.patch(f"/api/tasks/{parent_id}", json={"status": "done"})
-    assert r.status_code == 200
-    assert r.json()["status"] == "revising"
-
-
-def test_patch_done_when_api_child_is_done(client):
-    """E2E: все дочерние задачи (созданные через API) done → parent PATCH done → done."""
-    r = client.post("/api/tasks", json={"project_id": "p1", "title": "Parent"})
-    parent_id = r.json()["id"]
-
-    r = client.post("/api/tasks", json={
-        "project_id": "p1",
-        "title": "Child",
-        "parent_task_id": parent_id,
-    })
-    child_id = r.json()["id"]
-
-    client.patch(f"/api/tasks/{child_id}", json={"status": "done"})
-
-    r = client.patch(f"/api/tasks/{parent_id}", json={"status": "done"})
-    assert r.status_code == 200
-    assert r.json()["status"] == "done"
diff --git a/web/api.py b/web/api.py
index 6da7021..c788acd 100644
--- a/web/api.py
+++ b/web/api.py
@@ -660,19 +660,14 @@ def list_tasks(
     limit: int = Query(default=20, ge=1, le=500),
     sort: str = Query(default="updated_at"),
     project_id: str | None = Query(default=None),
-    parent_task_id: str | None = Query(default=None),
 ):
-    """List tasks with optional filters. sort defaults to updated_at desc.
-
-    parent_task_id: filter by parent task. Use '__none__' to get root tasks only.
-    """
+    """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,
-        parent_task_id=parent_task_id,
         limit=limit,
         sort=sort if sort in VALID_TASK_SORT_FIELDS else "updated_at",
         sort_dir="desc",
@@ -691,19 +686,6 @@ def get_task(task_id: str):
     return t
 
 
-@app.get("/api/tasks/{task_id}/children")
-def get_task_children(task_id: str):
-    """Get direct child tasks of a given task."""
-    conn = get_conn()
-    t = models.get_task(conn, task_id)
-    if not t:
-        conn.close()
-        raise HTTPException(404, f"Task '{task_id}' not found")
-    children = models.get_children(conn, task_id)
-    conn.close()
-    return children
-
-
 class TaskCreate(BaseModel):
     project_id: str
     title: str
@@ -712,7 +694,6 @@ class TaskCreate(BaseModel):
     category: str | None = None
     acceptance_criteria: str | None = None
     labels: list[str] | None = None
-    parent_task_id: str | None = None
 
 
 @app.post("/api/tasks")
@@ -733,8 +714,7 @@ def create_task(body: TaskCreate):
     t = models.create_task(conn, task_id, body.project_id, body.title,
                            priority=body.priority, brief=brief, category=category,
                            acceptance_criteria=body.acceptance_criteria,
-                           labels=body.labels,
-                           parent_task_id=body.parent_task_id)
+                           labels=body.labels)
     conn.close()
 
     # Auto-trigger: if task has 'auto' label, launch pipeline in background