wip: 客户评级弹窗化/公司信息精简/参数中文化/品牌站点同步（基于 927592b）

backend/app/repositories/customer_rating_repository.py

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+"""客户评级数据访问（每客户一行）。
+
+本层只 flush 不 commit —— 事务边界由 services 层控制。
+"""
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models import CustomerRating
+
+# ==================== 读取 ====================
+
+
+def get_by_customer_id(session: Session, customer_id: int) -> CustomerRating | None:
+    """查某客户的当前评级（uk_customer_ratings_customer_id 保证至多一行）。"""
+    stmt = select(CustomerRating).where(CustomerRating.customer_id == customer_id)
+    return session.execute(stmt).scalar_one_or_none()
+
+
+# ==================== 写入 ====================
+
+
+def create(session: Session, rating: CustomerRating) -> CustomerRating:
+    """新增评级行。只 flush 以取得自增 id。"""
+    session.add(rating)
+    session.flush()
+    return rating
+
+
+def delete(session: Session, rating: CustomerRating) -> None:
+    """删除评级行（客户物理删除前的联动清理，调用方先校验业务引用）。"""
+    session.delete(rating)
+    session.flush()