test limit_k=6

app/api/rag_routes.py

@@ -193,7 +193,7 @@ async def chat(request: ChatRequest, background_tasks: BackgroundTasks):
         # logger.info(f"Processing chat request for user {request.user_id}, session {session_id}")
 
         retriever = get_chain(
-            top_k=request.similarity_top_k,
+            top_k=request.similarity_top_k * 2,
             similarity_metric=request.similarity_metric,
             similarity_threshold=request.similarity_threshold
         )