code: def _downgrade_v2(op):
      
      # Drop indices before batch
      # This is to prevent index collision when creating the temp table
      op.drop_index('ix_equities_fuzzy_symbol')
      op.drop_index('ix_equities_company_symbol')
  
      # Execute batch op to allow column modification in SQLite
      with op.batch_alter_table('equities') as batch_op:
          batch_op.drop_column('auto_close_date')
  
      # Recreate indices after batch
      op.create_index('ix_equities_fuzzy_symbol',
                      table_name='equities',
                      columns=['fuzzy_symbol'])
      op.create_index('ix_equities_company_symbol',
                      table_name='equities',
                      columns=['company_symbol'])
docs: Downgrade assets db by removing the 'auto_close_date' column.