Fix: move _ensure_main_dataset_schema call after function definition

app.py

@@ -85,9 +85,6 @@ def _save_proxy_spaces():
 
 _load_proxy_spaces()
 
-# ─── Initialize main dataset schema on startup ───
-_ensure_main_dataset_schema()
-
 
 def _save_chat_id(cid: str, sender_id: str):
     if cid:
@@ -1921,6 +1918,10 @@ def get_dataset_info():
     return info
 
 
+# ─── Initialize main dataset schema on startup ───
+_ensure_main_dataset_schema()
+
+
 with gr.Blocks(title="Zalo Bot Webhook") as demo:
     gr.Markdown("# Zalo Bot Webhook Setup")
     with gr.Tabs():