Add data_migrations:fix_vaccination_records_location

This fixes an issue where some vaccination records are currently invalid
as they have both a `location_id` and a `location_name`.

Jira-Issue: MAV-2016

Author: thomasleese

lib/tasks/data_migrations.rake

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+namespace :data_migrations do
+  desc "Fix vaccination record locations where both location_id and location_name is set"
+  task fix_vaccination_record_locations: :environment do
+    vaccination_records =
+      VaccinationRecord
+        .where.not(location_id: nil)
+        .where.not(location_name: nil)
+
+    puts "#{vaccination_records.count} vaccination records need fixing"
+
+    vaccination_records.update_all(location_id: nil)
+  end
+end