Add role 'Moderator' to the 'roles' table

Also add the 'Moderator' scope to the User model.

src/api/app/models/user.rb

@@ -75,6 +75,7 @@ class User < ApplicationRecord
   scope :staff, -> { joins(:roles).where('roles.title' => 'Staff') }
   scope :not_staff, -> { where.not(id: User.unscoped.staff.pluck(:id)) }
   scope :admins, -> { joins(:roles).where('roles.title' => 'Admin') }
+  scope :moderators, -> { joins(:roles).where('roles.title' => 'Moderator') }
 
   scope :in_beta, -> { where(in_beta: true) }
   scope :in_rollout, -> { where(in_rollout: true) }

src/api/db/data/20230920125132_add_moderator_to_roles.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class AddModeratorToRoles < ActiveRecord::Migration[7.0]
+  def up
+    Role.where(title: 'Moderator', global: true).first_or_create
+  end
+
+  def down
+    Role.find_by(title: 'Moderator', global: true).destroy
+  end
+end

src/api/db/data_schema.rb

@@ -1 +1 @@
-DataMigrate::Data.define(version: 20230623122537)
+DataMigrate::Data.define(version: 20230920125132)

src/api/db/seeds.rb

@@ -49,6 +49,7 @@
 downloader_role = Role.where(title: 'downloader').first_or_create
 reader_role     = Role.where(title: 'reader').first_or_create
 Role.where(title: 'Staff').first_or_create(global: true)
+Role.where(title: 'Moderator').first_or_create(global: true)
 
 puts 'Seeding users table...'
 admin = User.where(login: 'Admin').first_or_create(login: 'Admin', email: 'root@localhost',