refac: default rag params

backend/open_webui/config.py

@@ -932,7 +932,7 @@ TIKA_SERVER_URL = PersistentConfig(
 )
 
 RAG_TOP_K = PersistentConfig(
-    "RAG_TOP_K", "rag.top_k", int(os.environ.get("RAG_TOP_K", "5"))
+    "RAG_TOP_K", "rag.top_k", int(os.environ.get("RAG_TOP_K", "3"))
 )
 RAG_RELEVANCE_THRESHOLD = PersistentConfig(
     "RAG_RELEVANCE_THRESHOLD",
@@ -1022,7 +1022,7 @@ RAG_RERANKING_MODEL_TRUST_REMOTE_CODE = (
 )
 
 CHUNK_SIZE = PersistentConfig(
-    "CHUNK_SIZE", "rag.chunk_size", int(os.environ.get("CHUNK_SIZE", "1500"))
+    "CHUNK_SIZE", "rag.chunk_size", int(os.environ.get("CHUNK_SIZE", "1000"))
 )
 CHUNK_OVERLAP = PersistentConfig(
     "CHUNK_OVERLAP",