Add settled_at to zaps, scope by settlement status

db/migrate/20240607123654_add_settled_at_to_zaps.rb

@@ -0,0 +1,9 @@
+class AddSettledAtToZaps < ActiveRecord::Migration[7.1]
+  def change
+    add_column :zaps, :settled_at, :datetime, default: nil
+
+    Zap.where.not(receipt: nil).each do |zap|
+      zap.update! settled_at: zap.receipt_event.created_at
+    end
+  end
+end