feat: drop duplicates in session.csv

app.py

@@ -47,7 +47,7 @@ if uploaded_file is not None and new_website_id:
     ]
 
     # Create DataFrame for session data
-    df_session = df[session_columns]
+    df_session = df[session_columns].drop_duplicates('session_id')
     df_session.to_csv('session.csv', index=False)
     st.download_button(label="Download Session CSV", data=df_session.to_csv(index=False), file_name='session.csv', mime='text/csv')