anchor.diff:    , {put, "g", 1}
     , {put, "f", 4}
     ].
  -
  -read_checkpoint_doc(Db, RepId) ->
  -  barrel_db:read_system_doc(Db, checkpoint_docid(RepId)).
  -
  -checkpoint_docid(RepId) ->
  -  <<"replication-checkpoint-", RepId/binary>>.
  
positive.code:   , source_not_empty
    , deleted_doc
    , random_activity
    %% , checkpoints
    ].
  
  init_per_suite(Config) ->
  
negative.code:    , source_not_empty/1
     , deleted_doc/1
     , random_activity/1
     ]).
  
  all() ->
  