Update app.py

app.py

@@ -889,7 +889,18 @@ with gr.Blocks(title="Adaptive SQL Trainer — Randomized Domains") as demo:
             gr.Markdown("### Quick Table/View Preview (top 20 rows)")
             tbl_dd = gr.Dropdown(choices=list_tables_for_preview(), label="Pick table/view", interactive=True)
             tbl_btn = gr.Button("Preview")
-            preview_df = gr.Dataframe(headers=[], interactive=False)
+            preview_df = gr.Dataframe(value=pd.DataFrame(), interactive=False)
+            
+            # Progress by Category (labeled)
+            mastery_df = gr.Dataframe(
+                headers=["category","attempts","correct","accuracy"],
+                col_count=(4, "dynamic"),
+                row_count=(0, "dynamic"),
+                interactive=False
+            )
+            
+            # Result Preview (always show query results here)
+            result_df = gr.Dataframe(value=pd.DataFrame(), interactive=False)
 
         with gr.Column(scale=2):
             prompt_md = gr.Markdown(visible=False)