Remove explicit session flush (and thus ordering of on_model_change and session flushing)

flask_admin/contrib/sqlamodel/view.py

@@ -584,7 +584,6 @@ class ModelView(BaseModelView):
             model = self.model()
             form.populate_obj(model)
             self.session.add(model)
-            self.session.flush()
             self.on_model_change(form, model)
             self.session.commit()
             return True
@@ -605,7 +604,6 @@ class ModelView(BaseModelView):
         try:
             form.populate_obj(model)
             self.on_model_change(form, model)
-            self.session.flush()
             self.session.commit()
             return True
         except Exception, ex: