fix(knowledge): articles共享层语义对齐评审方案——entity_id=0系统共享(替代NULL) (entity-memory-partition 复核对齐)

backend/app/api/knowledge_articles.py

@@ -37,17 +37,17 @@ def list_articles(
     db: Session = Depends(get_db),
     entity_id: int = Depends(get_entity_id),
 ):
-    """查询知识文章（本企业专属 ∪ 全局共享），可按关联页面或分类筛选
+    """查询知识文章（本企业专属 ∪ 系统共享），可按关联页面或分类筛选
 
     隔离语义（2026-09-03 多租户分区）：
-    - entity_id IS NULL → 全局共享（CMA 系统教学知识，所有企业可见）
+    - entity_id = 0 → 系统共享（CMA 教学知识，所有企业可见）
     - entity_id == 当前账套 → 企业专属（只本企业可见）
     - 其他企业的专属文章不可见
     """
     q = db.query(KnowledgeArticle).filter(
         or_(
             KnowledgeArticle.entity_id == entity_id,
-            KnowledgeArticle.entity_id.is_(None),
+            KnowledgeArticle.entity_id == 0,
         )
     )
     if related_page:
@@ -72,6 +72,6 @@ def get_article(
     )
     if not a:
         raise HTTPException(404, "文章不存在")
-    if a.entity_id is not None and a.entity_id != entity_id:
+    if a.entity_id != 0 and a.entity_id != entity_id:
         raise HTTPException(404, "文章不存在")
     return article_to_dict(a)

backend/app/models/knowledge_article.py

@@ -12,7 +12,7 @@ class KnowledgeArticle(Base):
     __tablename__ = "knowledge_articles"
 
     id = Column(Integer, primary_key=True, index=True)
-    entity_id = Column(Integer, nullable=True, index=True, comment="企业ID: NULL=全局共享(系统教学), 有值=企业专属 (多租户隔离 2026-09-03)")
+    entity_id = Column(Integer, default=0, nullable=False, index=True, comment="企业ID: 0=系统共享(CMA教学知识), >0=企业专属 (多租户隔离 2026-09-03)")
     title = Column(String(200), nullable=False, comment="文章标题")
     summary = Column(String(500), nullable=True, comment="一句话摘要")
     content = Column(Text, nullable=False, comment="文章正文（支持Markdown）")

backend/scripts/verify_knowledge_partition_e2e.py

@@ -39,11 +39,11 @@ for t in ['knowledge_events', 'knowledge_summaries', 'knowledge_articles']:
     cur.execute(f"SHOW INDEX FROM {t} WHERE Column_name='entity_id'")
     has_idx = cur.fetchone() is not None
     check(f"{t}.entity_id 列+索引", has_col and has_idx)
-# 存量全局文章（NULL）在加列后保持 38 篇
-cur.execute("SELECT COUNT(*) FROM knowledge_articles WHERE entity_id IS NULL")
+# 存量全局文章（entity_id=0 系统共享）在加列后保持 38 篇
+cur.execute("SELECT COUNT(*) FROM knowledge_articles WHERE entity_id = 0")
 g = cur.fetchone()[0]
-print(f"  存量全局文章(NULL): {g} 篇")
-check("存量全局教学文章保持全局共享", g == 38, f"(期望38)")
+print(f"  系统共享文章(entity_id=0): {g} 篇")
+check("存量系统共享教学文章保持", g == 38, f"(期望38)")
 
 # 1. 插临时验证文章（标题带标记，source 专属 entity）
 cur.execute("DELETE FROM knowledge_articles WHERE title LIKE %s", (f"%{MARK}%",))
@@ -56,7 +56,7 @@ cur.execute(
     (2, f"{MARK}E2专属越权测试", "s", "c", "term"))
 cur.execute(
     "INSERT INTO knowledge_articles (entity_id, title, summary, content, category) VALUES (%s,%s,%s,%s,%s)",
-    (None, f"{MARK}全局共享测试", "s", "c", "term"))
+    (0, f"{MARK}系统共享测试", "s", "c", "term"))
 conn.commit()
 cur.execute("SELECT id, entity_id, title FROM knowledge_articles WHERE title LIKE %s", (f"%{MARK}%",))
 rows = cur.fetchall()
@@ -98,13 +98,13 @@ if not t1 or not t2:
 st, body = api("GET", "/api/cma/knowledge-articles", token=t1)
 d1 = _json.loads(body)
 titles1 = {i["title"] for i in d1.get("data", [])}
-check("E1 见全局共享文章", f"{MARK}全局共享测试" in titles1)
+check("E1 见系统共享文章", f"{MARK}系统共享测试" in titles1)
 check("E1 见自己专属文章", f"{MARK}E1专属越权测试" in titles1)
 check("E1 不见 E2 专属文章", f"{MARK}E2专属越权测试" not in titles1, "(核心越权1)")
 # E2 视角
 st, body = api("GET", "/api/cma/knowledge-articles", token=t2)
 titles2 = {i["title"] for i in _json.loads(body).get("data", [])}
-check("E2 见全局共享文章", f"{MARK}全局共享测试" in titles2)
+check("E2 见系统共享文章", f"{MARK}系统共享测试" in titles2)
 check("E2 见自己专属文章", f"{MARK}E2专属越权测试" in titles2)
 check("E2 不见 E1 专属文章", f"{MARK}E1专属越权测试" not in titles2, "(核心越权2)")
 

backend/tests/test_security_knowledge_partition.py

@@ -139,7 +139,7 @@ class TestKnowledgeArticlesGlobalUnion:
     def test_articles_global_union_scope(self, client: TestClient, db: Session):
         """文章查询 = 本企业专属 ∪ 全局共享；他企专属不可见"""
         _ensure_entity(db, 2)
-        g = KnowledgeArticle(title="全局教学文章", content="c", category="term", entity_id=None)
+        g = KnowledgeArticle(title="全局教学文章", content="c", category="term", entity_id=0)
         e1 = KnowledgeArticle(title="E1专属文章", content="c", category="term", entity_id=1)
         e2 = KnowledgeArticle(title="E2专属文章", content="c", category="term", entity_id=2)
         db.add_all([g, e1, e2])
@@ -166,7 +166,7 @@ class TestKnowledgeArticlesGlobalUnion:
     def test_get_article_cross_entity_404(self, client: TestClient, db: Session):
         """越权：entity1 直取 entity2 专属文章 → 404；全局文章两账套可取"""
         _ensure_entity(db, 2)
-        g = KnowledgeArticle(title="全局文章", content="c", entity_id=None)
+        g = KnowledgeArticle(title="全局文章", content="c", entity_id=0)
         e2 = KnowledgeArticle(title="E2秘密文章", content="c", entity_id=2)
         db.add_all([g, e2])
         db.commit()