fix conversion

backend/config.py

@@ -1056,7 +1056,7 @@ RAG_EMBEDDING_MODEL_TRUST_REMOTE_CODE = (
 RAG_EMBEDDING_OPENAI_BATCH_SIZE = PersistentConfig(
     "RAG_EMBEDDING_OPENAI_BATCH_SIZE",
     "rag.embedding_openai_batch_size",
-    os.environ.get("RAG_EMBEDDING_OPENAI_BATCH_SIZE", 1),
+    int(os.environ.get("RAG_EMBEDDING_OPENAI_BATCH_SIZE", "1")),
 )
 
 RAG_RERANKING_MODEL = PersistentConfig(