SYSTEM FOR PROCESSING MODIFICATIONS TO DATA RECORDS

Techniques for controlling the synchronization of data records between servers and client devices include use of configuration data for each client device to control the times at which the current version of server data records is sent to each client device. The configuration data also controls the times at which modified versions of local data records on the client device are sent to the server. The configuration data additionally indicates one or more control actions that are performed if the data record version associated with user input modifying a data record does not match the current version of the server data record. Control actions may include preventing modification of data records, providing notifications to client devices, and providing the current version of server data records to client devices. In some cases, control actions may include permitting certain types of modifications while preventing other types of modifications.