create table changes (
  guid uuid not null,
  organization ,
  application ,
  from_version ,
  to_version ,
  diff ,
  changed_at timestamptz not null,
  changed_by ,
  audit 
);
comment on table changes is '
  Represents a single change from one version of a service to another
';

comment on column changes.changed_at is '
  Records the timestamp of when the actual change occurred (vs. when we created the changed record)
';
comment on column changes.changed_by is '
  Records who made the actual change
';