Restructure omni services and add Chatwoot research snapshot

research/chatwoot/app/models/inbox_assignment_policy.rb

@@ -0,0 +1,21 @@
+# == Schema Information
+#
+# Table name: inbox_assignment_policies
+#
+#  id                   :bigint           not null, primary key
+#  created_at           :datetime         not null
+#  updated_at           :datetime         not null
+#  assignment_policy_id :bigint           not null
+#  inbox_id             :bigint           not null
+#
+# Indexes
+#
+#  index_inbox_assignment_policies_on_assignment_policy_id  (assignment_policy_id)
+#  index_inbox_assignment_policies_on_inbox_id              (inbox_id) UNIQUE
+#
+class InboxAssignmentPolicy < ApplicationRecord
+  belongs_to :inbox
+  belongs_to :assignment_policy
+
+  validates :inbox_id, uniqueness: true
+end