[TYPO3-dev] How to set Mountpoints with a Extension or Hook

[Kjeld Schumacher]

Hi all,

i created a hook, whenever a new BE-User is created i create pages and 
set mountpoints and filemounts by my own database queries.
Setting "db_mountpoints" in table "be_users" to the page id.

Creating pages and filemount works, but mountpoint do not...
In the user settings no mountpoint is shown. And the pagetree for the 
new BE-User is emtpy/not set.

Any ideas why? Did i missed something?

Thanks
Kjeld Schumacher