domains: only flush if data not persisted

invenio_accounts/datastore.py

@@ -14,6 +14,7 @@
 from flask import current_app
 from flask_security import SQLAlchemyUserDatastore, user_confirmed
 from invenio_db import db
+from sqlalchemy import inspect
 from sqlalchemy.orm import joinedload
 
 from .models import Domain, Role, User
@@ -75,8 +76,9 @@ def commit(self):
 
     def mark_changed(self, sid, uid=None, rid=None, model=None):
         """Save a user to the changed history."""
-        # needed so that we have the id from the DB on the model
-        self.db.session.flush()
+        # add the ID to the model from the DB if needed
+        if not inspect(model).persistent:
+            self.db.session.flush()
 
         if model:
             if isinstance(model, User):