Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/models/assignment_policy.rb

@@ -0,0 +1,37 @@
+# == Schema Information
+#
+# Table name: assignment_policies
+#
+#  id                       :bigint           not null, primary key
+#  assignment_order         :integer          default("round_robin"), not null
+#  conversation_priority    :integer          default("earliest_created"), not null
+#  description              :text
+#  enabled                  :boolean          default(TRUE), not null
+#  fair_distribution_limit  :integer          default(100), not null
+#  fair_distribution_window :integer          default(3600), not null
+#  name                     :string(255)      not null
+#  created_at               :datetime         not null
+#  updated_at               :datetime         not null
+#  account_id               :bigint           not null
+#
+# Indexes
+#
+#  index_assignment_policies_on_account_id           (account_id)
+#  index_assignment_policies_on_account_id_and_name  (account_id,name) UNIQUE
+#  index_assignment_policies_on_enabled              (enabled)
+#
+class AssignmentPolicy < ApplicationRecord
+  belongs_to :account
+  has_many :inbox_assignment_policies, dependent: :destroy
+  has_many :inboxes, through: :inbox_assignment_policies
+
+  validates :name, presence: true, uniqueness: { scope: :account_id }
+  validates :fair_distribution_limit, numericality: { greater_than: 0 }
+  validates :fair_distribution_window, numericality: { greater_than: 0 }
+
+  enum conversation_priority: { earliest_created: 0, longest_waiting: 1 }
+
+  enum assignment_order: { round_robin: 0 } unless ChatwootApp.enterprise?
+end
+
+AssignmentPolicy.include_mod_with('Concerns::AssignmentPolicy')