id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
access_snailmail_letter_user,snailmail.letter.user,model_snailmail_letter,base.group_user,1,1,1,0
access_snailmail_letter_system,snailmail.letter.system,model_snailmail_letter,base.group_system,1,1,1,1