Add columns for saving the reason code and term from the Imms API

These columns will be used to save the SNOMED reason code and reason
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.

Jira-Issue: MAV-5719

Author: alistair-white-horne-tng

app/models/vaccination_record.rb

@@ -22,6 +22,8 @@
 #  nhs_immunisations_api_primary_source        :boolean
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_reason_code    :string
+#  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime
 #  nhs_immunisations_api_synced_at             :datetime
 #  notes                                       :text

db/migrate/20260331100000_add_reason_code_to_vaccination_records.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddReasonCodeToVaccinationRecords < ActiveRecord::Migration[8.1]
+  def change
+    change_table :vaccination_records, bulk: true do |t|
+      t.string :nhs_immunisations_api_snomed_reason_code
+      t.string :nhs_immunisations_api_snomed_reason_term
+    end
+  end
+end

db/schema.rb

@@ -10,8 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-
-ActiveRecord::Schema[8.1].define(version: 2026_03_30_130232) do
+ActiveRecord::Schema[8.1].define(version: 2026_03_31_100000) 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 +1006,8 @@
     t.boolean "nhs_immunisations_api_primary_source"
     t.string "nhs_immunisations_api_snomed_procedure_code"
     t.string "nhs_immunisations_api_snomed_procedure_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"
     t.datetime "nhs_immunisations_api_synced_at"
     t.text "notes"

spec/factories/vaccination_records.rb

@@ -22,6 +22,8 @@
 #  nhs_immunisations_api_primary_source        :boolean
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_reason_code    :string
+#  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime
 #  nhs_immunisations_api_synced_at             :datetime
 #  notes                                       :text

spec/models/vaccination_record_spec.rb

@@ -22,6 +22,8 @@
 #  nhs_immunisations_api_primary_source        :boolean
 #  nhs_immunisations_api_snomed_procedure_code :string
 #  nhs_immunisations_api_snomed_procedure_term :string
+#  nhs_immunisations_api_snomed_reason_code    :string
+#  nhs_immunisations_api_snomed_reason_term    :string
 #  nhs_immunisations_api_sync_pending_at       :datetime
 #  nhs_immunisations_api_synced_at             :datetime
 #  notes                                       :text