add external data fields to templates

app/models/template.rb

@@ -6,6 +6,7 @@
 #
 #  id                   :bigint           not null, primary key
 #  archived_at          :datetime
+#  external_data_fields :string
 #  fields               :text             not null
 #  name                 :string           not null
 #  preferences          :text             not null
@@ -78,6 +79,12 @@ class Template < ApplicationRecord
     external_id
   end
 
+  def external_data_fields
+    return {} if self[:external_data_fields].blank?
+
+    JSON.parse(self[:external_data_fields])
+  end
+
   private
 
   def maybe_set_default_folder

db/migrate/20250703143236_add_external_data_fields_to_templates.rb

@@ -0,0 +1,5 @@
+class AddExternalDataFieldsToTemplates < ActiveRecord::Migration[8.0]
+  def change
+    add_column :templates, :external_data_fields, :string
+  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[8.0].define(version: 2025_07_02_204317) do
+ActiveRecord::Schema[8.0].define(version: 2025_07_03_143236) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "pg_catalog.plpgsql"
@@ -393,6 +393,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_07_02_204317) do
     t.string "external_id"
     t.text "preferences", null: false
     t.boolean "shared_link", default: false, null: false
+    t.string "external_data_fields"
     t.index ["account_id", "folder_id", "id"], name: "index_templates_on_account_id_and_folder_id_and_id", where: "(archived_at IS NULL)"
     t.index ["account_id", "id"], name: "index_templates_on_account_id_and_id_archived", where: "(archived_at IS NOT NULL)"
     t.index ["account_id"], name: "index_templates_on_account_id"