Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/models/note.rb

@@ -0,0 +1,36 @@
+# == Schema Information
+#
+# Table name: notes
+#
+#  id         :bigint           not null, primary key
+#  content    :text             not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  account_id :bigint           not null
+#  contact_id :bigint           not null
+#  user_id    :bigint
+#
+# Indexes
+#
+#  index_notes_on_account_id  (account_id)
+#  index_notes_on_contact_id  (contact_id)
+#  index_notes_on_user_id     (user_id)
+#
+class Note < ApplicationRecord
+  before_validation :ensure_account_id
+  validates :content, presence: true
+  validates :account_id, presence: true
+  validates :contact_id, presence: true
+
+  belongs_to :account
+  belongs_to :contact
+  belongs_to :user, optional: true
+
+  scope :latest, -> { order(created_at: :desc) }
+
+  private
+
+  def ensure_account_id
+    self.account_id = contact&.account_id
+  end
+end