Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LG4iASZnHb1yEM1JAASiWn

diff --git a/db/migrate/002_create_users.rb b/db/migrate/002_create_users.rb
index 27e118c..34ef02d 100644
--- a/db/migrate/002_create_users.rb
+++ b/db/migrate/002_create_users.rb
@@ -5,8 +5,8 @@ Sequel.migration do
     create_table(:users) do
       primary_key :id
       String :login, null: false, unique: true
-      DateTime :created_at
-      DateTime :updated_at
+      DateTime :created_at, null: false
+      DateTime :updated_at, null: false
     end
 
     # Lists created before users existed have no owner.