def METHOD_NAME():
    """Create default ACLs/Roles needed by application.
    If a given ACL or Role already exists, it will be skipped."""
    all_acls = [ACL.create_or_get(a) for a in all_acl_ids]
    DBSession().add_all(all_acls)
    DBSession().commit()
    for r, acl_ids in role_acls.items():
        role = DBSession().get(Role, r)
        if role is None:
            role = Role(id=r)
        role.acls = [DBSession().get(ACL, a) for a in acl_ids]
        DBSession().add(role)
    DBSession().commit()