feat:新增投顾agent和nl2sqlagent

model/customer_relation.py

@@ -1,7 +1,7 @@
 """customer_relation 客户-投顾关系表 ORM 模型。
 
 同时服务于：
-- 投顾工作台（advisor）：签约状态 unsigned/signed/closed，工作台为唯一写入方；
+- 投顾工作台（advisor）：签约状态 已分配/已签约/已结束，工作台为唯一写入方；
 - 记忆/client_agent 模块：读取客户与投顾的当前或历史关系。
 """
 
@@ -9,15 +9,24 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import BigInteger, DateTime, String, func
+from sqlalchemy import BigInteger, CheckConstraint, DateTime, String, func
 from sqlalchemy.orm import Mapped, mapped_column
 
+from common.common_const import (
+    CUSTOMER_REL_STATUS_UNSIGNED,
+)
 from model.base import Base
 
 
 class CustomerRelation(Base):
     __tablename__ = "customer_relation"
-    __table_args__ = {"comment": "客户-投顾关系表（状态驱动：签约后投顾Agent方案正式触达客户）"}
+    __table_args__ = (
+        CheckConstraint(
+            "status IN ('已分配', '已签约', '已结束')",
+            name="ck_customer_relation_status",
+        ),
+        {"comment": "客户-投顾关系表（状态驱动：签约后投顾Agent方案正式触达客户）"},
+    )
 
     id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
     customer_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
@@ -28,6 +37,6 @@ class CustomerRelation(Base):
     signed_time: Mapped[datetime | None] = mapped_column(DateTime)
     end_time: Mapped[datetime | None] = mapped_column(DateTime)
     status: Mapped[str] = mapped_column(
-        String(16), nullable=False, server_default="unsigned"
+        String(16), nullable=False, server_default=CUSTOMER_REL_STATUS_UNSIGNED
     )
     reason: Mapped[str | None] = mapped_column(String(128))