private DatabaseVersion createPurgeDatabaseVersion(Map<FileHistoryId, FileVersion> mostRecentPurgeFileVersions) {
DatabaseVersionHeader lastDatabaseVersionHeader = localDatabase.getLastDatabaseVersionHeader();
VectorClock lastVectorClock = lastDatabaseVersionHeader.getVectorClock();
VectorClock purgeVectorClock = lastVectorClock.clone();
purgeVectorClock.incrementClock(config.getMachineName());
DatabaseVersionHeader purgeDatabaseVersionHeader = new DatabaseVersionHeader();
purgeDatabaseVersionHeader.setType(DatabaseVersionType.PURGE);
purgeDatabaseVersionHeader.setDate(new Date());
purgeDatabaseVersionHeader.setClient(config.getMachineName());