feat: Add support for realtime-events in copilot-threads and copilot-messages (#11557)

- Add API support for creating a thread
- Add API support for creating a message
- Remove uuid from thread (no longer required, we will use existing
websocket connection to send messages)
- Update message_type to a column (user, assistant, assistant_thinking)

enterprise/app/models/copilot_thread.rb

@@ -2,25 +2,47 @@
 #
 # 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
+#  id           :bigint           not null, primary key
+#  title        :string           not null
+#  created_at   :datetime         not null
+#  updated_at   :datetime         not null
+#  account_id   :bigint           not null
+#  assistant_id :integer
+#  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
+#  index_copilot_threads_on_account_id    (account_id)
+#  index_copilot_threads_on_assistant_id  (assistant_id)
+#  index_copilot_threads_on_user_id       (user_id)
 #
 class CopilotThread < ApplicationRecord
   belongs_to :user
   belongs_to :account
-  has_many :copilot_messages, dependent: :destroy
+  belongs_to :assistant, class_name: 'Captain::Assistant'
+  has_many :copilot_messages, dependent: :destroy_async
 
   validates :title, presence: true
-  validates :uuid, presence: true, uniqueness: true
+
+  def push_event_data
+    {
+      id: id,
+      title: title,
+      created_at: created_at.to_i,
+      user: user.push_event_data,
+      account_id: account_id
+    }
+  end
+
+  def previous_history
+    copilot_messages
+      .where(message_type: %w[user assistant])
+      .order(created_at: :asc)
+      .map do |copilot_message|
+        {
+          content: copilot_message.message,
+          role: copilot_message.message_type
+        }
+      end
+  end
 end