A reconciliation event can be detected. A controlling element of a database can be determined for the reconciliation event. The controlling element can include a preexisting database value for that element that is different from an update value for that element provided within update data. The update data can be provided by an update data source. A last data source that provided the preexisting database value can be ascertained. A priority array associated with the controlling element can be retrieved from a data store. It can be determined from the priority array whether the update data source has reconciliation priority over the last data source. A value of the controlling element in the database can be changed from the preexisting database value to the update value only when the update data source has reconciliation priority.