diff --git a/backend/package/yuxi/repositories/channels/base.py b/backend/package/yuxi/repositories/channels/base.py
index a69f578f..1e30af91 100644
--- a/backend/package/yuxi/repositories/channels/base.py
+++ b/backend/package/yuxi/repositories/channels/base.py
@@ -30,7 +30,9 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import delete as sa_delete, func, select, update as sa_update
+from sqlalchemy import delete as sa_delete
+from sqlalchemy import func, select
+from sqlalchemy import update as sa_update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from yuxi.utils.datetime_utils import utc_now_naive
diff --git a/backend/package/yuxi/repositories/channels/channel_audit_log_repository.py b/backend/package/yuxi/repositories/channels/channel_audit_log_repository.py
index 3fe62b83..0d2a2cad 100644
--- a/backend/package/yuxi/repositories/channels/channel_audit_log_repository.py
+++ b/backend/package/yuxi/repositories/channels/channel_audit_log_repository.py
@@ -6,7 +6,8 @@ from __future__ import annotations
 import datetime as dt
 from typing import Any
 
-from sqlalchemy import delete as sa_delete, func, select
+from sqlalchemy import delete as sa_delete
+from sqlalchemy import func, select
 
 from yuxi.repositories.channels.base import BaseRepository
 from yuxi.storage.postgres.models_channels import ChannelAuditLog
diff --git a/backend/package/yuxi/repositories/channels/channel_idempotency_repository.py b/backend/package/yuxi/repositories/channels/channel_idempotency_repository.py
index bd95ecaa..1df820cc 100644
--- a/backend/package/yuxi/repositories/channels/channel_idempotency_repository.py
+++ b/backend/package/yuxi/repositories/channels/channel_idempotency_repository.py
@@ -6,7 +6,8 @@ from __future__ import annotations
 import datetime as dt
 from typing import Any
 
-from sqlalchemy import delete as sa_delete, select, update
+from sqlalchemy import delete as sa_delete
+from sqlalchemy import select, update
 
 from yuxi.repositories.channels.base import BaseRepository
 from yuxi.storage.postgres.models_channels import ChannelIdempotency
diff --git a/backend/package/yuxi/repositories/channels/channel_outbox_repository.py b/backend/package/yuxi/repositories/channels/channel_outbox_repository.py
index 72f92f9d..16c9737c 100644
--- a/backend/package/yuxi/repositories/channels/channel_outbox_repository.py
+++ b/backend/package/yuxi/repositories/channels/channel_outbox_repository.py
@@ -235,11 +235,7 @@ class ChannelOutboxRepository(BaseRepository):
             limit: 返回数量上限。
             before: 仅返回 ``updated_at`` 早于此时间的条目（可选）。
         """
-        stmt = (
-            select(ChannelOutboxEntry)
-            .where(ChannelOutboxEntry.status == "failed")
-            .where(self._not_deleted())
-        )
+        stmt = select(ChannelOutboxEntry).where(ChannelOutboxEntry.status == "failed").where(self._not_deleted())
         if before is not None:
             stmt = stmt.where(ChannelOutboxEntry.updated_at < before)
         stmt = stmt.order_by(ChannelOutboxEntry.updated_at.asc()).limit(limit)
diff --git a/backend/package/yuxi/repositories/channels/channel_session_repository.py b/backend/package/yuxi/repositories/channels/channel_session_repository.py
index 2cb4fb60..8d9a7cf8 100644
--- a/backend/package/yuxi/repositories/channels/channel_session_repository.py
+++ b/backend/package/yuxi/repositories/channels/channel_session_repository.py
@@ -12,7 +12,6 @@ from yuxi.repositories.channels.base import BaseRepository
 from yuxi.storage.postgres.models_channels import ChannelAccount, ChannelSession
 from yuxi.utils.datetime_utils import utc_now_naive
 
-
 # 僵尸会话阈值：最近消息时间早于该天数视为僵尸会话（仅未关闭）
 _ZOMBIE_SESSION_DAYS = 7
 
diff --git a/backend/package/yuxi/repositories/channels/content_review_record_repository.py b/backend/package/yuxi/repositories/channels/content_review_record_repository.py
index dfd06c15..073c2dd5 100644
--- a/backend/package/yuxi/repositories/channels/content_review_record_repository.py
+++ b/backend/package/yuxi/repositories/channels/content_review_record_repository.py
@@ -4,10 +4,10 @@
 from __future__ import annotations
 
 from datetime import UTC, datetime
-
 from typing import Any
 
-from sqlalchemy import case, delete as sa_delete, func, select
+from sqlalchemy import case, func, select
+from sqlalchemy import delete as sa_delete
 
 from yuxi.repositories.channels.base import BaseRepository
 from yuxi.storage.postgres.models_channels import ChannelContentReviewRecord