Abstract: A system for allowing access to past data states of a software application, and allowing playback of the data state forward through time. This system captures changes to application data over time, and allows a client application to perform queries for a past time as well as the present time, in order to retrieve a data set representing the state of the application data at the desired point in time. Additionally, the system allows a client application to stream past changes over time, as well as stream live changes at the current point in time.