cubicweb #3596991 in a migration, rename_relation_type should NOT check constraints [rejected]

had the situation when upgrading tracker to 1.15 for which the migration does:

rename_relation_type('todo_by', 'assigned_to')

with a schema like:

class Version(EntityType):
   assigned_to = SubjectRelation('CWUser',
                        constraints=[RQLConstraint('O in_state ST, ST name "activated"'),
                                     RQLVocabularyConstraint('O in_group G, G name "staff"')],)

which fails due to old Versions which 'todo_by' points to a deactivated user.

done in3.18.4
load left0.000
closed by<not specified>