fix(analytics): 词库单字MySQL预览拒扫+IntegrityError 409+MATCH短语净化

Co-Authored-By: Claude Code <noreply@anthropic.com>

yunke-server/tests/test_sensitive.py

@@ -59,3 +59,36 @@ async def test_api_words_crud(make_client):
     assert r.status_code == 200 and r.json()["enabled"] is False
     r = await client.delete(f"/api/analytics/sensitive/words/{wid}")
     assert r.status_code == 200
+
+
+# 注:单字词 MySQL 拒预览分支(words.py ValueError)在 SQLite 测试库不可达
+# ——dialect 判定不满足,不做单测;由注释 + 路由 400 映射保障。
+
+
+async def test_api_patch_unknown_404(make_client):
+    async def seed(session):
+        ...
+
+    client = await make_client(seed)
+    r = await client.patch("/api/analytics/sensitive/words/999",
+                           json={"enabled": False})
+    assert r.status_code == 404
+
+
+async def test_api_delete_unknown_404(make_client):
+    async def seed(session):
+        ...
+
+    client = await make_client(seed)
+    r = await client.delete("/api/analytics/sensitive/words/999")
+    assert r.status_code == 404
+
+
+async def test_api_create_empty_word_409(make_client):
+    async def seed(session):
+        ...
+
+    client = await make_client(seed)
+    r = await client.post("/api/analytics/sensitive/words",
+                          json={"word": "   "})
+    assert r.status_code == 409