diff --git a/yunke-server/app/db/models.py b/yunke-server/app/db/models.py
index 9bce5b7..d9cbe28 100644
--- a/yunke-server/app/db/models.py
+++ b/yunke-server/app/db/models.py
@@ -1129,7 +1129,8 @@ class EmployeeCallDaily(Base):
 class EmployeeScoreConfig(Base):
     """评分配置版本(v1 §10.4/v2 §3.3)——config_json 存维度/指标/权重/
     方向/阈值/样本门槛;激活前须过权重总和与阈值校验(批次B scoring 实现)。
-    MVP 无可视化编辑器,受控 CLI 种子维护。"""
+    MVP 无可视化编辑器,受控 CLI 种子维护。
+    JSON 列(config_json 等)修改须整列重赋值,原地修改不会提交。"""
 
     __tablename__ = "employee_score_config"
 
@@ -1142,7 +1143,7 @@ class EmployeeScoreConfig(Base):
     )
     effective_from: Mapped[int | None] = mapped_column(Integer, nullable=True)
     effective_to: Mapped[int | None] = mapped_column(Integer, nullable=True)
-    config_json: Mapped[dict[str, Any] | None] = mapped_column(JSON, nullable=False)
+    config_json: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False)
     created_by: Mapped[str | None] = mapped_column(String(64), nullable=True)
     approved_by: Mapped[str | None] = mapped_column(String(64), nullable=True)
     created_at: Mapped[dt.datetime] = mapped_column(
diff --git a/yunke-server/tests/test_management_models.py b/yunke-server/tests/test_management_models.py
index 2582ea9..03c51b4 100644
--- a/yunke-server/tests/test_management_models.py
+++ b/yunke-server/tests/test_management_models.py
@@ -3,8 +3,6 @@
 只验证:建表可用、主键/唯一约束生效、默认值正确。业务逻辑在
 first_reply_facts / employee_metrics 的测试里。
 """
-import datetime as dt  # noqa: F401
-
 import pytest
 import sqlalchemy as sa
 from sqlalchemy.exc import IntegrityError
@@ -62,6 +60,19 @@ async def test_metric_daily_defaults_zero_not_none(make_session):
     assert row.data_complete is False or row.data_complete == 0  # SQLite 0/1
 
 
+async def test_metric_daily_pk_duplicate_rejected(make_session):
+    """同 (day, channel, user_id, metric_version) 复合主键防重。
+
+    Task 6 delete+insert 幂等重算的安全网:版本内重复落表直接 IntegrityError。
+    """
+    s = make_session
+    s.add(EmployeeMetricDaily(day=20260901, channel="wechat", user_id="u1"))
+    await s.commit()
+    s.add(EmployeeMetricDaily(day=20260901, channel="wechat", user_id="u1"))
+    with pytest.raises(IntegrityError):
+        await s.commit()
+
+
 async def test_call_daily_roundtrip(make_session):
     s = make_session
     s.add(EmployeeCallDaily(day=20260901, user_id="u1", call_count=2,
@@ -72,6 +83,15 @@ async def test_call_daily_roundtrip(make_session):
     assert row.call_seconds == 164
 
 
+async def test_call_daily_pk_duplicate_rejected(make_session):
+    s = make_session
+    s.add(EmployeeCallDaily(day=20260901, user_id="u1"))
+    await s.commit()
+    s.add(EmployeeCallDaily(day=20260901, user_id="u1"))
+    with pytest.raises(IntegrityError):
+        await s.commit()
+
+
 async def test_score_config_version_unique(make_session):
     s = make_session
     s.add(EmployeeScoreConfig(version="v1.0", name="一期试算",
@@ -83,6 +103,19 @@ async def test_score_config_version_unique(make_session):
         await s.commit()
 
 
+async def test_score_config_config_json_not_null(make_session):
+    """config_json NOT NULL——注解与 DDL 一致(修复:去掉 | None)。
+
+    注意 JSON 列语义:Python None 经 JSON 序列化变成字符串 'null' 而非
+    SQL NULL,不会违反约束;测 NOT NULL 须用 sa.null() 显式发 SQL NULL。
+    """
+    s = make_session
+    s.add(EmployeeScoreConfig(version="v1.0", name="空配置",
+                              config_json=sa.null()))
+    with pytest.raises(IntegrityError):
+        await s.commit()
+
+
 async def test_snapshot_batch_user_unique(make_session):
     s = make_session
     common = {"snapshot_batch_id": "b1", "period_type": "week",