Backfill ConsentFormProgramme.disease_types

Add rake task to backfill consent form programmes with disease types.

Author: murugapl

lib/tasks/backfill_consent_form_programme_disease_types.rake

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+namespace :data_migration do
+  desc "Backfills the `ConsentFormProgramme.disease_types` column for existing records"
+  task backfill_consent_form_programme_disease_types: :environment do
+    puts "Backfilling disease_types for ConsentFormProgramme records..."
+
+    updated_count = 0
+    skipped_count = 0
+
+    ConsentFormProgramme.find_each do |consent_form_programme|
+      if consent_form_programme.read_attribute(:disease_types).present?
+        skipped_count += 1
+        next
+      end
+
+      consent_form_programme.update_column(
+        :disease_types,
+        consent_form_programme.disease_types
+      )
+      updated_count += 1
+    end
+
+    puts "Updated: #{updated_count} records"
+    puts "Skipped: #{skipped_count} records (already had disease_types set)"
+  end
+end