A method includes receiving, at a processor, event stream data, the event stream data including a plurality of events associated with changes to an instance of a subject. The method further includes receiving, at the processor of the computing device, input indicating correction data. The method further includes outputting, from the processor of the computing device, modified event stream data to a storage device. The modified event stream data is generated based on the correction data by modifying an event of the event stream data, adding a first event to the event stream data, deleting a second event from the event stream data, or a combination thereof.