Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/models/notification_subscription.rb

@@ -0,0 +1,29 @@
+# == Schema Information
+#
+# Table name: notification_subscriptions
+#
+#  id                      :bigint           not null, primary key
+#  identifier              :text
+#  subscription_attributes :jsonb            not null
+#  subscription_type       :integer          not null
+#  created_at              :datetime         not null
+#  updated_at              :datetime         not null
+#  user_id                 :bigint           not null
+#
+# Indexes
+#
+#  index_notification_subscriptions_on_identifier  (identifier) UNIQUE
+#  index_notification_subscriptions_on_user_id     (user_id)
+#
+
+class NotificationSubscription < ApplicationRecord
+  belongs_to :user
+  validates :identifier, presence: true
+
+  SUBSCRIPTION_TYPES = {
+    browser_push: 1,
+    fcm: 2
+  }.freeze
+
+  enum subscription_type: SUBSCRIPTION_TYPES
+end