test/mv_web/member_live/index_field_visibility_test.exs

@@ -10,7 +10,8 @@ defmodule MvWeb.MemberLive.IndexFieldVisibilityTest do
   - Integration with member list display
   - Custom fields visibility
   """
-  use MvWeb.ConnCase, async: true
+  # async: false to prevent PostgreSQL deadlocks when creating members and custom fields
+  use MvWeb.ConnCase, async: false
 
   import Phoenix.LiveViewTest
   require Ash.Query

test/mv_web/user_live/form_test.exs

@@ -1,5 +1,6 @@
 defmodule MvWeb.UserLive.FormTest do
-  use MvWeb.ConnCase, async: true
+  # async: false to prevent PostgreSQL deadlocks when creating members and users
+  use MvWeb.ConnCase, async: false
   import Phoenix.LiveViewTest
 
   # Helper to setup authenticated connection and live view