Refactor portfolio filtering in app.py to convert entries to string and remove invalid values before saving to compressed format. This update enhances data integrity and ensures only valid entries are retained.

app.py

@@ -777,7 +777,8 @@ if selected_tab == 'Data Load':
                 st.session_state['map_dict'] = create_memory_efficient_mappings(st.session_state['projections_df'], site_var, type_var, sport_var)
             
             # Store portfolio in compressed format and clean up
-            # st.session_state['portfolio'] = st.session_state['portfolio'][st.session_state['portfolio']['salary'] <= salary_max]
+            st.session_state['portfolio'] = st.session_state['portfolio'].astype(str)
+            st.session_state['portfolio'] = st.session_state['portfolio'][~st.session_state['portfolio'].isin(['', 'nan', 'None', 'NaN']).any(axis=1)].reset_index(drop=True)
             buffer = io.BytesIO()
             st.session_state['portfolio'].to_parquet(buffer, compression='snappy')
             st.session_state['origin_portfolio'] = buffer.getvalue()