add personalization settings

app/models/account.rb

@@ -14,6 +14,7 @@
 class Account < ApplicationRecord
   has_many :users, dependent: :destroy
   has_many :encrypted_configs, dependent: :destroy
+  has_many :account_configs, dependent: :destroy
   has_many :templates, dependent: :destroy
   has_many :submissions, through: :templates
   has_many :submitters, through: :submissions

app/models/account_config.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: account_configs
+#
+#  id         :bigint           not null, primary key
+#  key        :string           not null
+#  value      :text             not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  account_id :bigint           not null
+#
+# Indexes
+#
+#  index_account_configs_on_account_id          (account_id)
+#  index_account_configs_on_account_id_and_key  (account_id,key) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (account_id => accounts.id)
+#
+class AccountConfig < ApplicationRecord
+  SUBMITTER_INVITATION_EMAIL_KEY = 'submitter_invitation_email'
+
+  DEFAULT_VALUES = {
+    SUBMITTER_INVITATION_EMAIL_KEY => {
+      'subject' => 'You have been invited to submit a form',
+      'body' => "Hi there,\n\n" \
+                "You have been invited to submit the \"{{template.name}}\" form:\n\n" \
+                "{{submitter.link}}\n\n" \
+                "Please contact us by replying to this email if you didn't request this.\n\n" \
+                "Thanks,\n" \
+                '{{account.name}}'
+    }
+  }.freeze
+
+  belongs_to :account
+
+  serialize :value, JSON
+end