Hello mandrael,
SEBLOD don't store additionnal fields in cck_core_fields. This table is only for SEBLOD fonctionnement, and you don't have to manage it.
When you create a User Profil, 2 solutions (like article):
- Padlock closed: fields will be stored in the table "#__cck_store_form_users" (only available in user content type)
- Padlock Open: fields will be stored in the table "#__cck_store_item_users" (avalaible for other user content type if you create other )
Regards.
Lionel