jahia ldap migration / acl database model

Hi dev_list, Hi jahia devs

I'm still working on a migration tool for migration of database 
users to ldap users. So far the tool creates for every database 
user (without root, siteadmin and guest) a user on a specific part 
of a LDAP tree. Currently this is achieved by writing a LDIF file 
which is then programaticaly imported into the directory server. 
The user creation process and conversion is finished and works 
nicely.

My problem is to change the ACL's or at least the group membership 
in the jahia database tables to the newly created ldap users. I 
looked into the actual table structure and data... but I get no 
clue from it. Especially the jahia_grp_access table seems to mix 
groups & users on the same table column. Is there any formal 
database model? 

The plan is:

1. rename every occurence of dbuserX to ldapuserX on tablesinvolved
2. finished :P

best regards
Daniel Zimmermann