chore: fix ruff lint (webhooks v2) + Windows-safe test teardown

app/routers/api_v2.py

@@ -16,7 +16,6 @@ from fastapi import APIRouter, Header, HTTPException, Request
 from fastapi.responses import JSONResponse, Response
 
 from app.db import get_conn
-from app.services.automations import fire_event as _fire_event
 from app.services.api_v2_helpers import (
     audit_log,
     check_idempotency,
@@ -30,6 +29,7 @@ from app.services.api_v2_helpers import (
     to_iso8601,
     validate_scopes_input,
 )
+from app.services.automations import fire_event as _fire_event
 
 logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/api/v2", tags=["api-v2"])

app/routers/sync.py

@@ -30,7 +30,9 @@ def _user(request: Request, authorization: str | None = None,
         try:
             user = get_bearer_user(request, authorization)
         except HTTPException:
-            raise HTTPException(status_code=401, detail="Invalid or expired API token")
+            raise HTTPException(
+                status_code=401, detail="Invalid or expired API token"
+            ) from None
         if not has_scope(user.get("_token_scopes"), required_scope):
             raise HTTPException(
                 status_code=403,

tests/test_app.py

@@ -42,7 +42,10 @@ def client():
 
     yield TestClient(app)
 
-    os.unlink(db_path)
+    try:
+        os.unlink(db_path)
+    except PermissionError:
+        pass  # Windows: file may still be open in another thread
 
 
 # ── Core ──

tests/test_webhooks_v2.py

@@ -1,12 +1,7 @@
 """FlowDeck — v6.4.0 Webhooks v2 tests (HMAC, retries, +20 events)."""
 from __future__ import annotations
 
-import asyncio
+from unittest.mock import AsyncMock, MagicMock
-import hashlib
-import hmac
-import json
-import time
-from unittest.mock import AsyncMock, MagicMock, patch
 
 import httpx
 import pytest
@@ -17,15 +12,11 @@ from app.services.webhook_outbound import (
     RETRY_DELAYS,
     _deliver_once,
     _event_matches,
-    deliver_to_sub,
-    fire_event,
     init_webhook_tables,
-    retry_due_deliveries,
     sign_payload,
     verify_signature,
 )
 
-
 # ── Fixtures ────────────────────────────────────────────────────────────────
 
 @pytest.fixture