old_contents: OPERATION_COLUMN = 'operation'
  OLD_SITE_CODE_COLUMN = 'site_code'
  NEW_SITE_CODE_COLUMN = 'new_site_code'
  MERGE_OPERATION = 'Merge'
  SPLIT_OPERATION = 'Split'
  MOVE_OPERATION = 'Move'
  EXTRACT_OPERATION = 'Extract'
  VALID_OPERATIONS = [MERGE_OPERATION, SPLIT_OPERATION, MOVE_OPERATION, EXTRACT_OPERATION]
  
  # metadata fields on locations
  DEPRECATED_TO = "deprecated_to"  # destination location this location was deprecated to
  DEPRECATED_VIA = "deprecated_at"  # operation via this location was deprecated
  DEPRECATED_AT = "deprecated_at"  # datetime when this location was deprecated
  DEPRECATES = "deprecates"  # source location that this location deprecated
  DEPRECATES_VIA = "deprecates_via"  # operation via which this location deprecated the source location
  DEPRECATES_AT = "deprecates_at"  # datetime when this location deprecated the other location
  
new_contents: OPERATION_COLUMN = 'operation'
  OLD_SITE_CODE_COLUMN = 'site_code'
  NEW_SITE_CODE_COLUMN = 'new_site_code'
  MERGE_OPERATION = 'Merge'
  SPLIT_OPERATION = 'Split'
  MOVE_OPERATION = 'Move'
  EXTRACT_OPERATION = 'Extract'
  VALID_OPERATIONS = [MERGE_OPERATION, SPLIT_OPERATION, MOVE_OPERATION, EXTRACT_OPERATION]
  
  # metadata fields on locations
  DEPRECATED_TO = "deprecated_to"  # destination location this location was deprecated to
  DEPRECATED_VIA = "deprecated_via"  # operation via this location was deprecated
  DEPRECATED_AT = "deprecated_at"  # datetime when this location was deprecated
  DEPRECATES = "deprecates"  # source location that this location deprecated
  DEPRECATES_VIA = "deprecates_via"  # operation via which this location deprecated the source location
  DEPRECATES_AT = "deprecates_at"  # datetime when this location deprecated the other location
  
subject: fix text