text: ALTER TABLE samples
     ADD COLUMN group_id integer;
  COMMENT ON COLUMN samples.group_id IS 'Foreign key to the groups table. Identifies the recording group that this sample was posted into, if explicitly posted to a group.';
  
  ALTER TABLE cache_occurrences
     ADD COLUMN group_id integer;
  
  COMMENT ON COLUMN cache_occurrences.group_id IS 'Foreign key to the groups table. Identifies the recording group that this record was posted into, if explicitly posted to a group.';
  
  