Update knowledge base layout

api/tests/test_knowledge.py

@@ -1,6 +1,7 @@
 """Tests for Knowledge Base API endpoints"""
 import pytest
 import uuid
+from app.models import KnowledgeBase
 
 
 class TestKnowledgeAPI:
@@ -224,8 +225,8 @@ class TestKnowledgeAPI:
             {"chunkSize": 1000, "chunkOverlap": 100},
             {"chunkSize": 256, "chunkOverlap": 25}
         ]
-        for config in configs:
-            data = {"name": "Chunk Test KB", **config}
+        for idx, config in enumerate(configs):
+            data = {"name": f"Chunk Test KB {idx}", **config}
             response = client.post("/api/knowledge/bases", json=data)
             assert response.status_code == 200
 
@@ -253,3 +254,25 @@ class TestKnowledgeAPI:
         assert response.status_code == 200
         data = response.json()
         assert len(data["documents"]) == 3
+
+    def test_create_knowledge_base_duplicate_name(self, client):
+        """Test duplicate KB names are rejected for same user."""
+        payload = {"name": "Duplicate KB"}
+        first = client.post("/api/knowledge/bases", json=payload)
+        assert first.status_code == 200
+
+        second = client.post("/api/knowledge/bases", json=payload)
+        assert second.status_code == 400
+
+    def test_update_embedding_model_blocked_when_chunks_exist(self, client, db_session):
+        """Test embedding model change is blocked after indexing chunks."""
+        create_resp = client.post("/api/knowledge/bases", json={"name": "KB Embedding Lock"})
+        assert create_resp.status_code == 200
+        kb_id = create_resp.json()["id"]
+
+        kb = db_session.query(KnowledgeBase).filter(KnowledgeBase.id == kb_id).first()
+        kb.chunk_count = 5
+        db_session.commit()
+
+        update_resp = client.put(f"/api/knowledge/bases/{kb_id}", json={"embeddingModel": "text-embedding-3-large"})
+        assert update_resp.status_code == 400