diff --git a/apps/api/app/tasks/lipsync_tts.py b/apps/api/app/tasks/lipsync_tts.py
index 7651911f5..187e0be07 100644
--- a/apps/api/app/tasks/lipsync_tts.py
+++ b/apps/api/app/tasks/lipsync_tts.py
@@ -269,7 +269,7 @@ def tts_synthesize_and_submit(
             retries = getattr(self.request, "retries", 0)
             max_retries = 3
             if retries < max_retries:
-                backoff = (2 ** retries) + (retries * 1)  # 1s, 3s, 7s
+                backoff = (2**retries) + (retries * 1)  # 1s, 3s, 7s
                 logger.warning(
                     "[lipsync_tts] Job not found yet (retry %d/%d, backoff %ds): job_id=%s",
                     retries + 1,
diff --git a/tests/unit/test_lipsync_speed_optimization.py b/tests/unit/test_lipsync_speed_optimization.py
index 13d9e4220..bca1c14dc 100644
--- a/tests/unit/test_lipsync_speed_optimization.py
+++ b/tests/unit/test_lipsync_speed_optimization.py
@@ -300,6 +300,7 @@ class TestCreateJobCommitOrder:
 
         def track_commit():
             call_order.append("commit")
+
         def track_apply_async(*args, **kwargs):
             call_order.append("apply_async")
 
@@ -317,15 +318,17 @@ class TestCreateJobCommitOrder:
         # 至少有一次 commit 在 apply_async 之前
         assert "commit" in call_order, "db.commit 必须被调用"
         assert "apply_async" in call_order, "apply_async 必须被调用"
-        assert call_order.index("commit") < call_order.index("apply_async"), (
-            f"事务顺序错误：commit 必须在 apply_async 之前，实际顺序 {call_order}"
-        )
+        assert call_order.index("commit") < call_order.index(
+            "apply_async"
+        ), f"事务顺序错误：commit 必须在 apply_async 之前，实际顺序 {call_order}"
 
     def test_job_not_found_retry_mechanism_exists(self):
         """worker 侧 job not found 必须有重试机制（self.retry），而不是静默 return。"""
         import inspect
+
         from app.tasks.lipsync_tts import tts_synthesize_and_submit
+
         source = inspect.getsource(tts_synthesize_and_submit.run)
-        assert "self.retry" in source or "retry" in source, (
-            "tts_synthesize_and_submit 在 job not found 时必须重试，防止静默失败"
-        )
+        assert (
+            "self.retry" in source or "retry" in source
+        ), "tts_synthesize_and_submit 在 job not found 时必须重试，防止静默失败"