WP Database a plugin for WordPress by Nikunj Soni resets the WordPress database to the default installation. It deletes all content and custom changes. It will only reset the database. It will not modify or delete any files.
It adds a settings page to “Dashboard”->”Tools”->”Reset WP” where you can simply reset your WordPress database.
It adds submenu to the Admin Bar under the site title for quick access of this plugin.
Resets WordPress in quick time.
Handy tool for WordPress Programmers to reset database.
More info: https://wordpress.org/plugins/reset-wp/