fix the lint error in backend

backend/app/gateway/routers/threads.py

@@ -13,7 +13,6 @@ matching the LangGraph Platform wire format expected by the
 from __future__ import annotations
 
 import logging
-import re
 import time
 import uuid
 from typing import Any

backend/app/gateway/services.py

@@ -8,18 +8,16 @@ frames, and consuming stream bridge events.  Router modules
 from __future__ import annotations
 
 import asyncio
-import dataclasses
 import json
 import logging
 import re
-import time
 from collections.abc import Mapping
 from typing import Any
 
 from fastapi import HTTPException, Request
 from langchain_core.messages import HumanMessage
 
-from app.gateway.deps import get_run_context, get_run_manager, get_run_store, get_stream_bridge
+from app.gateway.deps import get_run_context, get_run_manager, get_stream_bridge
 from app.gateway.utils import sanitize_log_param
 from deerflow.runtime import (
     END_SENTINEL,

backend/packages/harness/deerflow/persistence/feedback/model.py

@@ -13,9 +13,7 @@ from deerflow.persistence.base import Base
 class FeedbackRow(Base):
     __tablename__ = "feedback"
 
-    __table_args__ = (
-        UniqueConstraint("thread_id", "run_id", "user_id", name="uq_feedback_thread_run_user"),
-    )
+    __table_args__ = (UniqueConstraint("thread_id", "run_id", "user_id", name="uq_feedback_thread_run_user"),)
 
     feedback_id: Mapped[str] = mapped_column(String(64), primary_key=True)
     run_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)

backend/scripts/migrate_user_isolation.py

@@ -5,11 +5,10 @@ Usage:
 
 The script is idempotent — re-running it after a successful migration is a no-op.
 """
+
 import argparse
-import json
 import logging
 import shutil
-from pathlib import Path
 
 from deerflow.config.paths import Paths, get_paths
 

backend/tests/_router_auth_helpers.py

@@ -29,7 +29,6 @@ apps with the real middleware — those should not use this module.
 from __future__ import annotations
 
 from collections.abc import Callable
-from typing import ParamSpec, TypeVar
 from unittest.mock import AsyncMock, MagicMock
 from uuid import uuid4
 
@@ -113,11 +112,7 @@ def make_authed_test_app(
     return app
 
 
-_P = ParamSpec("_P")
-_R = TypeVar("_R")
-
-
-def call_unwrapped(decorated: Callable[_P, _R], /, *args: _P.args, **kwargs: _P.kwargs) -> _R:
+def call_unwrapped[*P, R](decorated: Callable[P, R], /, *args: P.args, **kwargs: P.kwargs) -> R:
     """Invoke the underlying function of a ``@require_permission``-decorated route.
 
     ``functools.wraps`` sets ``__wrapped__`` on each layer; we walk all

backend/tests/test_memory_queue_user_isolation.py

@@ -1,4 +1,5 @@
 """Tests for user_id propagation through memory queue."""
+
 from unittest.mock import MagicMock, patch
 
 from deerflow.agents.memory.queue import ConversationContext, MemoryUpdateQueue

backend/tests/test_memory_storage_user_isolation.py

@@ -1,8 +1,10 @@
 """Tests for per-user memory storage isolation."""
-import pytest
+
 from pathlib import Path
 from unittest.mock import patch
 
+import pytest
+
 from deerflow.agents.memory.storage import FileMemoryStorage, create_empty_memory
 
 
@@ -65,8 +67,8 @@ class TestUserIsolatedStorage:
             assert loaded_a["user"]["workContext"]["summary"] == "A"
 
     def test_no_user_id_uses_legacy_path(self, base_dir: Path):
-        from deerflow.config.paths import Paths
         from deerflow.config.memory_config import MemoryConfig
+        from deerflow.config.paths import Paths
 
         paths = Paths(base_dir)
         with patch("deerflow.agents.memory.storage.get_paths", return_value=paths):
@@ -79,8 +81,8 @@ class TestUserIsolatedStorage:
 
     def test_user_and_legacy_do_not_interfere(self, base_dir: Path):
         """user_id=None (legacy) and user_id='alice' must use different files and caches."""
-        from deerflow.config.paths import Paths
         from deerflow.config.memory_config import MemoryConfig
+        from deerflow.config.paths import Paths
 
         paths = Paths(base_dir)
         with patch("deerflow.agents.memory.storage.get_paths", return_value=paths):

backend/tests/test_memory_updater_user_isolation.py

@@ -1,7 +1,8 @@
 """Tests for user_id propagation in memory updater."""
+
 from unittest.mock import MagicMock, patch
 
-from deerflow.agents.memory.updater import get_memory_data, clear_memory_data, _save_memory_to_file
+from deerflow.agents.memory.updater import _save_memory_to_file, clear_memory_data, get_memory_data
 
 
 def test_get_memory_data_passes_user_id():

backend/tests/test_migration_user_isolation.py

@@ -1,8 +1,10 @@
 """Tests for per-user data migration."""
+
 import json
-import pytest
 from pathlib import Path
 
+import pytest
+
 from deerflow.config.paths import Paths
 
 
@@ -23,6 +25,7 @@ class TestMigrateThreadDirs:
         (legacy / "file.txt").write_text("hello")
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         migrate_thread_dirs(paths, thread_owner_map={"t1": "alice"})
 
         expected = base_dir / "users" / "alice" / "threads" / "t1" / "user-data" / "workspace" / "file.txt"
@@ -35,6 +38,7 @@ class TestMigrateThreadDirs:
         legacy.mkdir(parents=True)
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         migrate_thread_dirs(paths, thread_owner_map={})
 
         expected = base_dir / "users" / "default" / "threads" / "t2"
@@ -45,6 +49,7 @@ class TestMigrateThreadDirs:
         new_dir.mkdir(parents=True)
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         migrate_thread_dirs(paths, thread_owner_map={"t1": "alice"})
         assert new_dir.exists()
 
@@ -58,6 +63,7 @@ class TestMigrateThreadDirs:
         (dest / "new.txt").write_text("new")
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         migrate_thread_dirs(paths, thread_owner_map={"t1": "alice"})
 
         assert (dest / "new.txt").read_text() == "new"
@@ -69,6 +75,7 @@ class TestMigrateThreadDirs:
         legacy.mkdir(parents=True)
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         migrate_thread_dirs(paths, thread_owner_map={})
 
         assert not (base_dir / "threads").exists()
@@ -78,6 +85,7 @@ class TestMigrateThreadDirs:
         legacy.mkdir(parents=True)
 
         from scripts.migrate_user_isolation import migrate_thread_dirs
+
         report = migrate_thread_dirs(paths, thread_owner_map={"t1": "alice"}, dry_run=True)
 
         assert len(report) == 1
@@ -91,6 +99,7 @@ class TestMigrateMemory:
         legacy_mem.write_text(json.dumps({"version": "1.0", "facts": []}))
 
         from scripts.migrate_user_isolation import migrate_memory
+
         migrate_memory(paths, user_id="default")
 
         expected = base_dir / "users" / "default" / "memory.json"
@@ -106,6 +115,7 @@ class TestMigrateMemory:
         dest.write_text(json.dumps({"version": "new"}))
 
         from scripts.migrate_user_isolation import migrate_memory
+
         migrate_memory(paths, user_id="default")
 
         assert json.loads(dest.read_text())["version"] == "new"
@@ -113,4 +123,5 @@ class TestMigrateMemory:
 
     def test_no_legacy_memory_is_noop(self, base_dir: Path, paths: Paths):
         from scripts.migrate_user_isolation import migrate_memory
+
         migrate_memory(paths, user_id="default")  # should not raise

backend/tests/test_paths_user_isolation.py

@@ -1,7 +1,9 @@
 """Tests for user-scoped path resolution in Paths."""
-import pytest
+
 from pathlib import Path
 
+import pytest
+
 from deerflow.config.paths import Paths
 
 

backend/tests/test_run_event_store_pagination.py

@@ -1,4 +1,5 @@
 """Tests for paginated list_messages_by_run across all RunEventStore backends."""
+
 import pytest
 
 from deerflow.runtime.events.store.memory import MemoryRunEventStore
@@ -14,14 +15,19 @@ async def test_list_messages_by_run_default_returns_all(base_store):
     store = base_store
     for i in range(7):
         await store.put(
-            thread_id="t1", run_id="run-a",
+            thread_id="t1",
+            run_id="run-a",
             event_type="human_message" if i % 2 == 0 else "ai_message",
-            category="message", content=f"msg-a-{i}",
+            category="message",
+            content=f"msg-a-{i}",
         )
     for i in range(3):
         await store.put(
-            thread_id="t1", run_id="run-b",
-            event_type="human_message", category="message", content=f"msg-b-{i}",
+            thread_id="t1",
+            run_id="run-b",
+            event_type="human_message",
+            category="message",
+            content=f"msg-b-{i}",
         )
     await store.put(thread_id="t1", run_id="run-a", event_type="tool_call", category="trace", content="trace")
 
@@ -36,9 +42,11 @@ async def test_list_messages_by_run_with_limit(base_store):
     store = base_store
     for i in range(7):
         await store.put(
-            thread_id="t1", run_id="run-a",
+            thread_id="t1",
+            run_id="run-a",
             event_type="human_message" if i % 2 == 0 else "ai_message",
-            category="message", content=f"msg-a-{i}",
+            category="message",
+            content=f"msg-a-{i}",
         )
 
     msgs = await store.list_messages_by_run("t1", "run-a", limit=3)
@@ -52,9 +60,11 @@ async def test_list_messages_by_run_after_seq(base_store):
     store = base_store
     for i in range(7):
         await store.put(
-            thread_id="t1", run_id="run-a",
+            thread_id="t1",
+            run_id="run-a",
             event_type="human_message" if i % 2 == 0 else "ai_message",
-            category="message", content=f"msg-a-{i}",
+            category="message",
+            content=f"msg-a-{i}",
         )
 
     all_msgs = await store.list_messages_by_run("t1", "run-a")
@@ -69,9 +79,11 @@ async def test_list_messages_by_run_before_seq(base_store):
     store = base_store
     for i in range(7):
         await store.put(
-            thread_id="t1", run_id="run-a",
+            thread_id="t1",
+            run_id="run-a",
             event_type="human_message" if i % 2 == 0 else "ai_message",
-            category="message", content=f"msg-a-{i}",
+            category="message",
+            content=f"msg-a-{i}",
         )
 
     all_msgs = await store.list_messages_by_run("t1", "run-a")
@@ -86,13 +98,19 @@ async def test_list_messages_by_run_does_not_include_other_run(base_store):
     store = base_store
     for i in range(7):
         await store.put(
-            thread_id="t1", run_id="run-a",
-            event_type="human_message", category="message", content=f"msg-a-{i}",
+            thread_id="t1",
+            run_id="run-a",
+            event_type="human_message",
+            category="message",
+            content=f"msg-a-{i}",
         )
     for i in range(3):
         await store.put(
-            thread_id="t1", run_id="run-b",
-            event_type="human_message", category="message", content=f"msg-b-{i}",
+            thread_id="t1",
+            run_id="run-b",
+            event_type="human_message",
+            category="message",
+            content=f"msg-b-{i}",
         )
 
     msgs = await store.list_messages_by_run("t1", "run-b")

backend/tests/test_run_journal.py

@@ -381,5 +381,3 @@ class TestMiddlewareEvents:
         event_types = {e["event_type"] for e in events}
         assert "middleware:title" in event_types
         assert "middleware:guardrail" in event_types
-
-

backend/tests/test_runs_api_endpoints.py

@@ -1,15 +1,14 @@
 """Tests for GET /api/runs/{run_id}/messages and GET /api/runs/{run_id}/feedback endpoints."""
+
 from __future__ import annotations
 
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, MagicMock
 
-import pytest
 from _router_auth_helpers import make_authed_test_app
 from fastapi.testclient import TestClient
 
 from app.gateway.routers import runs
 
-
 # ---------------------------------------------------------------------------
 # Helpers
 # ---------------------------------------------------------------------------
@@ -113,7 +112,8 @@ def test_run_messages_passes_after_seq_to_event_store():
         response = client.get("/api/runs/run-3/messages?after_seq=5")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-3", "run-3",
+        "thread-3",
+        "run-3",
         limit=51,  # default limit(50) + 1
         before_seq=None,
         after_seq=5,
@@ -133,7 +133,8 @@ def test_run_messages_respects_custom_limit():
         response = client.get("/api/runs/run-4/messages?limit=10")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-4", "run-4",
+        "thread-4",
+        "run-4",
         limit=11,  # 10 + 1
         before_seq=None,
         after_seq=None,
@@ -153,7 +154,8 @@ def test_run_messages_passes_before_seq_to_event_store():
         response = client.get("/api/runs/run-5/messages?before_seq=10")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-5", "run-5",
+        "thread-5",
+        "run-5",
         limit=51,
         before_seq=10,
         after_seq=None,

backend/tests/test_thread_run_messages_pagination.py

@@ -1,15 +1,14 @@
 """Tests for paginated GET /api/threads/{thread_id}/runs/{run_id}/messages endpoint."""
+
 from __future__ import annotations
 
 from unittest.mock import AsyncMock, MagicMock
 
-import pytest
 from _router_auth_helpers import make_authed_test_app
 from fastapi.testclient import TestClient
 
 from app.gateway.routers import thread_runs
 
-
 # ---------------------------------------------------------------------------
 # Helpers
 # ---------------------------------------------------------------------------
@@ -78,7 +77,8 @@ def test_after_seq_forwarded_to_event_store():
         response = client.get("/api/threads/thread-3/runs/run-3/messages?after_seq=5")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-3", "run-3",
+        "thread-3",
+        "run-3",
         limit=51,  # default limit(50) + 1
         before_seq=None,
         after_seq=5,
@@ -94,7 +94,8 @@ def test_before_seq_forwarded_to_event_store():
         response = client.get("/api/threads/thread-4/runs/run-4/messages?before_seq=10")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-4", "run-4",
+        "thread-4",
+        "run-4",
         limit=51,
         before_seq=10,
         after_seq=None,
@@ -110,7 +111,8 @@ def test_custom_limit_forwarded_to_event_store():
         response = client.get("/api/threads/thread-5/runs/run-5/messages?limit=10")
     assert response.status_code == 200
     event_store.list_messages_by_run.assert_awaited_once_with(
-        "thread-5", "run-5",
+        "thread-5",
+        "run-5",
         limit=11,  # 10 + 1
         before_seq=None,
         after_seq=None,

backend/tests/test_user_context.py

@@ -10,8 +10,8 @@ from types import SimpleNamespace
 import pytest
 
 from deerflow.runtime.user_context import (
-    CurrentUser,
     DEFAULT_USER_ID,
+    CurrentUser,
     get_current_user,
     get_effective_user_id,
     require_current_user,
@@ -100,6 +100,7 @@ def test_effective_user_id_returns_user_id_when_set():
 def test_effective_user_id_coerces_to_str():
     """User.id might be a UUID object; must come back as str."""
     import uuid
+
     uid = uuid.uuid4()
 
     user = SimpleNamespace(id=uid)