Add columns for product code and term from Imms API records

These columns will be used to save the SNOMED product code and product
term for records which we pull from the Imms API. This will be useful
for us to query when investigating for the Vaccs History Alpha.

The product code is already used when assigning the `Vaccine` for the
record. However, the records which we ingest have more product codes
than we have `Vaccine` objects; the range of codes which we get is so
broad that we can't map all of them to `Vaccine` objects. The solution
until now was to save these denormalised in the notes, but this solution
will make it much easier to query them. It's also possible for the terms
to be different, despite having the same codes; it would be useful to be
able to analyse this. 

Jira-Issue: MAV-5901

Author: alistair-white-horne-tng

app/models/vaccination_record.rb

@@ -23,6 +23,8 @@
 #  nhs_immunisations_api_recorded_at           :datetime
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_product_code   :string
+#  nhs_immunisations_api_snomed_product_term   :string
 #  nhs_immunisations_api_snomed_reason_code    :string
 #  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime

db/migrate/20260407120000_add_nhs_immunisations_api_snomed_product_to_vaccination_records.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddNHSImmunisationsAPISnomedProductToVaccinationRecords < ActiveRecord::Migration[
+  8.1
+]
+  def change
+    change_table :vaccination_records, bulk: true do |t|
+      t.string :nhs_immunisations_api_snomed_product_code
+      t.string :nhs_immunisations_api_snomed_product_term
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_03_31_110000) do
+ActiveRecord::Schema[8.1].define(version: 2026_04_07_120000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
   enable_extension "pg_trgm"
@@ -1007,6 +1007,8 @@
     t.datetime "nhs_immunisations_api_recorded_at"
     t.string "nhs_immunisations_api_snomed_procedure_code"
     t.string "nhs_immunisations_api_snomed_procedure_term"
+    t.string "nhs_immunisations_api_snomed_product_code"
+    t.string "nhs_immunisations_api_snomed_product_term"
     t.string "nhs_immunisations_api_snomed_reason_code"
     t.string "nhs_immunisations_api_snomed_reason_term"
     t.datetime "nhs_immunisations_api_sync_pending_at"

spec/factories/vaccination_records.rb

@@ -23,6 +23,8 @@
 #  nhs_immunisations_api_recorded_at           :datetime
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_product_code   :string
+#  nhs_immunisations_api_snomed_product_term   :string
 #  nhs_immunisations_api_snomed_reason_code    :string
 #  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime

spec/models/vaccination_record_spec.rb

@@ -23,6 +23,8 @@
 #  nhs_immunisations_api_recorded_at           :datetime
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_product_code   :string
+#  nhs_immunisations_api_snomed_product_term   :string
 #  nhs_immunisations_api_snomed_reason_code    :string
 #  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime