Convert to rake task

 - This means that the normalisation can be applied independent of the deployment, making the deployment less likely to fail.
 - The effects can be more closely monitored.

Author: alistair-white-horne-tng

db/migrate/20250506133833_normalise_whitespace.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+desc "Normalise the white space in a number of fields for patients and parents to ensure consistency."
+task normalise_whitespace: :environment do
+  Patient.find_each do |patient|
+    patient_fields = %i[
+      given_name
+      family_name
+      preferred_given_name
+      preferred_family_name
+      address_line_1
+      address_line_2
+      address_town
+      registration
+    ]
+
+    patient_fields.each do |field|
+      patient[field] = patient[field]&.normalise_whitespace
+    end
+
+    Patient.record_timestamps = false
+    patient.save!
+    Patient.record_timestamps = true
+  end
+
+  Parent.find_each do |parent|
+    parent.full_name = parent.full_name&.normalise_whitespace
+
+    Parent.record_timestamps = false
+    parent.save!
+    Parent.record_timestamps = true
+  end
+end