feat: add migration for converations with labels

db/migrate/20230602120613_create_conversation_with_labels.rb

@@ -0,0 +1,8 @@
+class CreateConversationWithLabels < ActiveRecord::Migration[7.0]
+  def change
+    create_view :conversation_with_labels
+
+    add_index :conversation_with_labels, :id, unique: true
+    add_index :conversation_with_labels, :account_id
+  end
+end

db/views/conversation_with_labels_v01.sql

@@ -0,0 +1,11 @@
+SELECT
+  conversations.*,
+  array_agg(tags.name) as labels_array
+FROM
+  conversations
+  LEFT JOIN taggings ON taggings.taggable_id = conversations.id
+  AND taggings.taggable_type = 'Conversation'
+  AND taggings.context = 'labels'
+  LEFT JOIN tags ON tags.id = taggings.tag_id
+GROUP BY
+  conversations.id;