refactor(channel repos): 拆分sqlalchemy导入并简化多行语句

1. 将分散的sqlalchemy导入拆分为单独行，统一导入格式
2. 简化channel_outbox_repository中的多行select语句为一行
3. 删除无用的空行注释

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

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

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

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 = (
+        stmt = select(ChannelOutboxEntry).where(ChannelOutboxEntry.status == "failed").where(self._not_deleted())
-            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)

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
 

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