diff --git a/config.json b/config.json
index 8e895e8..d93d382 100644
--- a/config.json
+++ b/config.json
@@ -1,3 +1,3 @@
 {
-    "process_count": 2
+    "process_count": 1
 }
diff --git a/minigrida/database/helpers.py b/minigrida/database/helpers.py
index 50b7cd8..a3e945c 100644
--- a/minigrida/database/helpers.py
+++ b/minigrida/database/helpers.py
@@ -34,7 +34,7 @@ def create_experiment(session_name, protocol, expe, urgency=1):
         e = q.first()
         e.sessions.add(session)
     else:
-        Experiment(sessions=session, protocol=protocol, expe=expe, expe_hash=expe_hash)
+        Experiment(sessions=session, protocol=protocol, expe=expe, expe_hash=expe_hash, urgency=urgency)
 
 @orm.db_session
 def create_project(name):
@@ -81,7 +81,7 @@ def update_experiment(expe, **params):
         _update_experiment(expe, **params)
 
 
-@orm.db_session
+@orm.db_session(optimistic=False, retry=3)
 def _update_experiment(expe, **params):
     e = Experiment.get_for_update(id=expe.id)
     for k, v in params.items():