feat: Add APIs for custom attribute definitions (#2689)

app/models/account.rb

@@ -61,6 +61,8 @@ class Account < ApplicationRecord
   has_many :kbase_articles, dependent: :destroy, class_name: '::Kbase::Article'
   has_many :teams, dependent: :destroy
   has_many :custom_filters, dependent: :destroy
+  has_many :custom_attribute_definitions, dependent: :destroy
+
   has_flags ACCOUNT_SETTINGS_FLAGS.merge(column: 'settings_flags').merge(DEFAULT_QUERY_SETTING)
 
   enum locale: LANGUAGES_CONFIG.map { |key, val| [val[:iso_639_1_code], key] }.to_h

app/models/custom_attribute_definition.rb

@@ -0,0 +1,34 @@
+# == Schema Information
+#
+# Table name: custom_attribute_definitions
+#
+#  id                     :bigint           not null, primary key
+#  attribute_display_name :string
+#  attribute_display_type :integer          default("text")
+#  attribute_key          :string
+#  attribute_model        :integer          default("conversation_attribute")
+#  default_value          :integer
+#  created_at             :datetime         not null
+#  updated_at             :datetime         not null
+#  account_id             :bigint
+#
+# Indexes
+#
+#  attribute_key_model_index                         (attribute_key,attribute_model) UNIQUE
+#  index_custom_attribute_definitions_on_account_id  (account_id)
+#
+class CustomAttributeDefinition < ApplicationRecord
+  validates :attribute_display_name, presence: true
+
+  validates :attribute_key,
+            presence: true,
+            uniqueness: { scope: :attribute_model }
+
+  validates :attribute_display_type, presence: true
+  validates :attribute_model, presence: true
+
+  enum attribute_model: { conversation_attribute: 0, contact_attribute: 1 }
+  enum attribute_display_type: { text: 0, number: 1, currency: 2, percent: 3, link: 4 }
+
+  belongs_to :account
+end