update history table

app.py

@@ -249,8 +249,11 @@ if user_input:
 if st.session_state.history:
     with st.expander("📜 Analysis History"):
         history_df = pd.DataFrame(st.session_state.history)
+        history_df_output = (history_df
+                     .sort_values('timestamp', ascending=False)
+                     .head(20))
         st.dataframe(
-            history_df,
+            history_df_output,
             column_config={
                 "timestamp": "Time",
                 "text": "Input Text",