This approach uses part of sqlalchemy example history_meta code

adapted to recording inserts and updates.

This removes need to manually create history tables.

Our code still remains in control of when history records are
created.

app/dao/services_dao.py

@@ -1,7 +1,14 @@
+import uuid
+
 from app import db
 from app.models import Service
 from sqlalchemy import asc
 
+from app.dao.dao_utils import (
+    transactional,
+    versioned
+)
+
 
 def dao_fetch_all_services():
     return Service.query.order_by(asc(Service.created_at)).all()
@@ -19,22 +26,20 @@ def dao_fetch_service_by_id_and_user(service_id, user_id):
     return Service.query.filter(Service.users.any(id=user_id)).filter_by(id=service_id).one()
 
 
+@transactional
+@versioned
 def dao_create_service(service, user):
-    try:
-        from app.dao.permissions_dao import permission_dao
-        service.users.append(user)
-        permission_dao.add_default_service_permissions_for_user(user, service)
-        db.session.add(service)
-    except Exception as e:
-        db.session.rollback()
-        raise e
-    else:
-        db.session.commit()
+    from app.dao.permissions_dao import permission_dao
+    service.users.append(user)
+    permission_dao.add_default_service_permissions_for_user(user, service)
+    service.id = uuid.uuid4()  # must be set now so version history model can use same id
+    db.session.add(service)
 
 
+@transactional
+@versioned
 def dao_update_service(service):
     db.session.add(service)
-    db.session.commit()
 
 
 def dao_add_user_to_service(service, user, permissions=[]):