Described herein is a computer implemented method. A change event record of a change history dataset is processed by determining if the change event record matches any field matching records. The change event record matches a particular field matching record if it is determined that a change event record field identifier matches a field identifier of the particular field matching record and a new value associated with the change event record matches a comparison variable of the particular field matching record. In response to determining that the change event record matches a single field matching record, the change event record is associated with a unique field identifier of the single field matching record in a data store.