Implement conditional team stacking logic in app.py: add a check to ensure 'Stack' column is created only if it doesn't exist, enhancing the portfolio's team analysis functionality and preventing redundant calculations.

app.py

@@ -231,14 +231,16 @@ with tab1:
             projections['player_names'] = projections['player_names'].map(lambda x: projections_match_dict.get(x, x))
             st.session_state['projections_df'] = projections
 
-            team_dict = dict(zip(st.session_state['projections_df']['player_names'], st.session_state['projections_df']['team']))
-            st.session_state['portfolio']['stack'] = st.session_state['portfolio'].apply(
-                lambda row: Counter(
-                    team_dict.get(player, '') for player in row[2:]
-                    if team_dict.get(player, '') != ''
-                ).most_common(1)[0][0] if any(team_dict.get(player, '') for player in row[2:]) else '',
-                axis=1
-            )
+            if 'Stack' not in st.session_state['portfolio'].columns:
+                team_dict = dict(zip(st.session_state['projections_df']['player_names'], st.session_state['projections_df']['team']))
+                st.session_state['portfolio']['Stack'] = st.session_state['portfolio'].apply(
+                    lambda row: Counter(
+                        team_dict.get(player, '') for player in row[2:]
+                        if team_dict.get(player, '') != ''
+                    ).most_common(1)[0][0] if any(team_dict.get(player, '') for player in row[2:]) else '',
+                    axis=1
+                )
+                stack_dict = dict(zip(st.session_state['portfolio'].index, st.session_state['portfolio']['Stack']))
 
             working_frame = st.session_state['portfolio'].copy()
             try: