Systems, clients, servers, methods, and computer-readable media of varying scope are described that maintain versions of data related to projects. Included in the system is a visual interface, a source repository and a project database. The source repository maintains versions of source code associated with a software development project. The project database maintains project data associated with the project. The project database maintains versions of the project data. The visual interface provides a mechanism for reading and updating the project data. As project data is updated a method is invoked in which a current version of the data is located. The current version is determined by examining which data structure has an end-time value that is blank or null. The current version's end-time is set to the current time (i.e. the time of the update), thereby turning the current version into a previous version of the project data. A new data structure is created that contains the updated value. The end-time value for the new data structure is set to blank or null, indicating that it is the current version.