Add support for persistent copilot messages and threads

app/models/account.rb

@@ -64,6 +64,7 @@ class Account < ApplicationRecord
   has_many :canned_responses, dependent: :destroy_async
   has_many :categories, dependent: :destroy_async, class_name: '::Category'
   has_many :contacts, dependent: :destroy_async
+  has_many :copilot_threads, dependent: :destroy
   has_many :conversations, dependent: :destroy_async
   has_many :csat_survey_responses, dependent: :destroy_async
   has_many :custom_attribute_definitions, dependent: :destroy_async

app/models/copilot_message.rb

@@ -0,0 +1,27 @@
+# == Schema Information
+#
+# Table name: copilot_messages
+#
+#  id                :bigint           not null, primary key
+#  message           :jsonb            not null
+#  message_type      :string           not null
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#  account_id        :bigint           not null
+#  copilot_thread_id :bigint           not null
+#  user_id           :bigint           not null
+#
+# Indexes
+#
+#  index_copilot_messages_on_account_id         (account_id)
+#  index_copilot_messages_on_copilot_thread_id  (copilot_thread_id)
+#  index_copilot_messages_on_user_id            (user_id)
+#
+class CopilotMessage < ApplicationRecord
+  belongs_to :copilot_thread
+  belongs_to :user
+  belongs_to :account
+
+  validates :message_type, presence: true, inclusion: { in: %w[user assistant assistant_thinking] }
+  validates :message, presence: true
+end

app/models/copilot_thread.rb

@@ -0,0 +1,26 @@
+# == Schema Information
+#
+# Table name: copilot_threads
+#
+#  id         :bigint           not null, primary key
+#  title      :string           not null
+#  uuid       :uuid             not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  account_id :bigint           not null
+#  user_id    :bigint           not null
+#
+# Indexes
+#
+#  index_copilot_threads_on_account_id  (account_id)
+#  index_copilot_threads_on_user_id     (user_id)
+#  index_copilot_threads_on_uuid        (uuid) UNIQUE
+#
+class CopilotThread < ApplicationRecord
+  belongs_to :user
+  belongs_to :account
+  has_many :copilot_messages, dependent: :destroy
+
+  validates :title, presence: true
+  validates :uuid, presence: true, uniqueness: true
+end

app/models/user.rb

@@ -78,6 +78,7 @@ class User < ApplicationRecord
   alias_attribute :conversations, :assigned_conversations
   has_many :csat_survey_responses, foreign_key: 'assigned_agent_id', dependent: :nullify, inverse_of: :assigned_agent
   has_many :conversation_participants, dependent: :destroy_async
+  has_many :copilot_threads, dependent: :destroy
   has_many :participating_conversations, through: :conversation_participants, source: :conversation
 
   has_many :inbox_members, dependent: :destroy_async