old_contents: OPERATION_COLUMN_NAME = 'operation'
  MERGE_OPERATION = 'Merge'
  SPLIT_OPERATION = 'Split'
  MOVE_OPERATION = 'Rename'
  EXTRACT_OPERATION = 'Extract'
  VALID_OPERATIONS = [MERGE_OPERATION, SPLIT_OPERATION, MOVE_OPERATION, EXTRACT_OPERATION]
  
new_contents: OPERATION_COLUMN_NAME = 'operation'
  MERGE_OPERATION = 'Merge'
  SPLIT_OPERATION = 'Split'
  MOVE_OPERATION = 'Move'
  EXTRACT_OPERATION = 'Extract'
  VALID_OPERATIONS = [MERGE_OPERATION, SPLIT_OPERATION, MOVE_OPERATION, EXTRACT_OPERATION]
  
subject: use Move for move operation