Implement conditional initialization for duplication frame in app.py

- Added a check to ensure 'duplication_frame' is only created if it does not already exist in session state, enhancing data management and preventing unnecessary recalculations.
- This update improves application performance and ensures that user-specific selections are accurately reflected in the duplication metrics.

app.py

@@ -460,14 +460,14 @@ with tab2:
                             user_dupe_select = user_dupe_select
                         else:
                             user_dupe_select = None
-                
-                dupe_frame = st.session_state['display_contest_info'][['BaseName', 'EntryCount', 'dupes', 'uniques', 'under_5', 'under_10']]
-                dupe_frame['average_dupes'] = dupe_frame['dupes'].mean()
-                dupe_frame['uniques%'] = dupe_frame['uniques'] / dupe_frame['EntryCount']
-                dupe_frame['under_5%'] = dupe_frame['under_5'] / dupe_frame['EntryCount']
-                dupe_frame['under_10%'] = dupe_frame['under_10'] / dupe_frame['EntryCount']
-                dupe_frame = dupe_frame[['BaseName', 'EntryCount', 'average_dupes', 'uniques', 'uniques%', 'under_5', 'under_5%', 'under_10', 'under_10%']].drop_duplicates(subset='BaseName', keep='first')
-                st.session_state['duplication_frame'] = dupe_frame.sort_values(by='EntryCount', ascending=False)
+                if 'duplication_frame' not in st.session_state:
+                    dupe_frame = st.session_state['display_contest_info'][['BaseName', 'EntryCount', 'dupes', 'uniques', 'under_5', 'under_10']]
+                    dupe_frame['average_dupes'] = dupe_frame['dupes'].mean()
+                    dupe_frame['uniques%'] = dupe_frame['uniques'] / dupe_frame['EntryCount']
+                    dupe_frame['under_5%'] = dupe_frame['under_5'] / dupe_frame['EntryCount']
+                    dupe_frame['under_10%'] = dupe_frame['under_10'] / dupe_frame['EntryCount']
+                    dupe_frame = dupe_frame[['BaseName', 'EntryCount', 'average_dupes', 'uniques', 'uniques%', 'under_5', 'under_5%', 'under_10', 'under_10%']].drop_duplicates(subset='BaseName', keep='first')
+                    st.session_state['duplication_frame'] = dupe_frame.sort_values(by='EntryCount', ascending=False)
                 if user_dupe_var == 'Specific':
                     st.session_state['duplication_frame'] = st.session_state['duplication_frame'][st.session_state['duplication_frame']['BaseName'].isin(user_dupe_select)]