           new Thread(accountId: 'a', clientId: '1', lastMessageReceivedTimestamp: 1),
         ]
         mustUpdate: true
-        mustRefetchAllIds: false
       },{
         name: 'Item in set deleted'
         change:

          type: 'unpersist'
        nextModels: 'unchanged'
        mustUpdate: false
        mustRefetchAllIds: false
      }]

    },{

          new Thread(accountId: 'a', clientId: '3', lastMessageReceivedTimestamp: 3),
          new Thread(accountId: 'a', clientId: '2', lastMessageReceivedTimestamp: 2),
        ]
        mustUpdate: true
        mustTrigger: true
      },{
        name: 'Item saved - does not match query clauses, offset > 0'
        change:
