feat: validate timezone

app/models/account.rb

@@ -85,6 +85,7 @@ class Account < ApplicationRecord
   validates_with JsonSchemaValidator,
                  schema: SETTINGS_PARAMS_SCHEMA,
                  attribute_resolver: ->(record) { record.settings }
+  validate :validate_reporting_timezone
 
   store_accessor :settings, :auto_resolve_after, :auto_resolve_message, :auto_resolve_ignore_waiting
 
@@ -215,6 +216,12 @@ class Account < ApplicationRecord
     # method overridden in enterprise module
   end
 
+  def validate_reporting_timezone
+    return if reporting_timezone.blank? || ActiveSupport::TimeZone[reporting_timezone].present?
+
+    errors.add(:reporting_timezone, I18n.t('errors.account.reporting_timezone.invalid'))
+  end
+
   def remove_account_sequences
     ActiveRecord::Base.connection.exec_query("drop sequence IF EXISTS camp_dpid_seq_#{id}")
     ActiveRecord::Base.connection.exec_query("drop sequence IF EXISTS conv_dpid_seq_#{id}")