Fix Phase 1 server validation defects

ansible/roles/cezen-backend/files/cezen-api.service

@@ -9,6 +9,7 @@ User=cezen
 WorkingDirectory=/opt/cezen/backend
 Environment="CEZEN_DATA=/opt/cezen/data"
 Environment="OLLAMA_URL=http://localhost:11434"
+Environment="CHROMA_URL=http://localhost:8100"
 Environment="PATH=/opt/cezen/backend/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"
 ExecStart=/opt/cezen/backend/venv/bin/uvicorn main:app --host 0.0.0.0 --port 8080 --workers 2
 Restart=always

ansible/roles/cezen-backend/files/main.py

@@ -2412,6 +2412,11 @@ def _ollama_embed(texts: list[str], model: str = OLLAMA_EMBED) -> list[list[floa
                 log_context=f"_ollama_embed(model={model})", log_exc=e)
     return embeddings
 
+def _chroma_collection_id(name: str) -> str:
+    """Resolve a stable Chroma collection name to the UUID required by data routes."""
+    collection = _chroma_req("GET", f"/api/v1/collections/{name}")
+    return collection["id"]
+
 # Collections
 @app.get("/api/rag/collections")
 async def list_collections(admin: dict = Depends(admin_only)):
@@ -2554,7 +2559,8 @@ async def delete_document(cid: int, doc_id: int, admin: dict = Depends(admin_onl
     # Remove chunks from ChromaDB
     if col:
         try:
-            _chroma_req("POST", f"/api/v1/collections/{col['chroma_name']}/delete",
+            chroma_id = _chroma_collection_id(col["chroma_name"])
+            _chroma_req("POST", f"/api/v1/collections/{chroma_id}/delete",
                         body={"where": {"doc_id": {"$eq": doc_id}}})
         except Exception:
             pass
@@ -2598,7 +2604,8 @@ async def rag_query(body: dict, user: dict = Depends(current_user)):
         raise HTTPException(status_code=503, detail="Failed to embed query")
 
     # Query ChromaDB
-    result = _chroma_req("POST", f"/api/v1/collections/{col['chroma_name']}/query", body={
+    chroma_id = _chroma_collection_id(col["chroma_name"])
+    result = _chroma_req("POST", f"/api/v1/collections/{chroma_id}/query", body={
         "query_embeddings": embed,
         "n_results": n_results,
         "include": ["documents", "metadatas", "distances"]

ansible/roles/cezen-backend/files/rag_ingest.py

@@ -162,9 +162,9 @@ def chunk_text(text: str, chunk_size: int = CHUNK_SIZE, overlap: int = CHUNK_OVE
                     chunk = chunk[:idx + len(sep)]
                     break
         chunks.append(chunk.strip())
-        start += len(chunk) - overlap
-        if start >= len(text):
+        if end >= len(text):
             break
+        start += max(1, len(chunk) - overlap)
     return [c for c in chunks if c]
 
 # ── Embedding ─────────────────────────────────────────────────────────────────
@@ -197,8 +197,10 @@ def chroma_upsert(ids, embeddings, documents, metadatas):
         "documents":  documents,
         "metadatas":  metadatas,
     }).encode()
+    with urllib.request.urlopen(f"{args.chroma_url}/api/v1/collections/{args.collection}", timeout=30) as response:
+        collection_id = json.loads(response.read().decode())["id"]
     req = urllib.request.Request(
-        f"{args.chroma_url}/api/v1/collections/{args.collection}/upsert",
+        f"{args.chroma_url}/api/v1/collections/{collection_id}/upsert",
         data=body, method="POST"
     )
     req.add_header("Content-Type", "application/json")