Add purge to history...

wise-webapp/src/main/java/com/wisemapping/service/MindmapService.java

@@ -67,4 +67,6 @@ public interface MindmapService {
     LockManager getLockManager();
 
     boolean isAdmin(@Nullable User user);
+
+    void removeHistory(int mapId);
 }

wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java

@@ -82,6 +82,11 @@ public class MindmapServiceImpl
         return user != null && user.getEmail() != null && user.getEmail().equals(adminUser);
     }
 
+    @Override
+    public void removeHistory(int mapId) {
+        mindmapManager.removeHistory(mapId);
+    }
+
     @Override
     public Mindmap getMindmapByTitle(String title, User user) {
         return mindmapManager.getMindmapByTitle(title, user);