A device is configured to receive a reconstruction request that identifies a time instance value and an identifier for a portion of a document. The device is further configured to identify a time window between a current time value and the time instance value and to identify entries within a change history log within the time window that are associated with the identifier for the portion of the document. The device is further configured to generate a reconstructed document mapping by undoing the changes to the document mapping based on the identified entries within the change history log that are within the time window and that are associated with the identifier for the portion of the document. The device is configured to undo the changes that were performed by the identified entries in a reverse chronological order. The device is further configured to output the reconstructed document mapping.