Update app.py

app.py

@@ -260,6 +260,26 @@ if fetch_data:
                     hide_index=True
                 )
 
+            # Sidebar: Metadata Missing Stats
+            missing_df = (
+                pd.DataFrame(list(missing_counts.items()), columns=["Field", "Missing Count"])
+                .sort_values(by="Missing Count", ascending=False)
+                .reset_index(drop=True)
+            )
+            
+            styled_missing_df = (
+                missing_df.style
+                .background_gradient(cmap="Blues", subset=["Missing Count"])
+                .hide(axis="index")
+            )
+            
+            with st.sidebar.expander("🧹 Missing Metadata Summary", expanded=True):
+                st.dataframe(
+                    styled_missing_df,
+                    use_container_width=True,
+                    hide_index=True,  # <<< ADD THIS
+                    height=min(300, len(missing_df) * 35 + 38)
+            
             # Calculate Top 10 Subjects
             if 'subject' in metadata_df.columns:
                 top_subjects = (