text: create table sites_granted (
  	site_id integer not null,
  	plugin_id integer not null,
  	granted_site_id integer not null,
  	primary key (site_id, plugin_id, granted_site_id)
  ) ENGINE=InnoDB;
  
  alter table sites_granted 
  	add index FK_sites_granted_granted_site_id (granted_site_id), 
  	add constraint FK_sites_granted_granted_site_id 
  	foreign key (granted_site_id) 
  	references site (id);
  
  alter table sites_granted 
  	add index FK_sites_granted_site_id_plugin_id (site_id, plugin_id), 
  	add constraint FK_sites_granted_site_id_plugin_id 
  	foreign key (site_id, plugin_id) 
  	references site_plugin (plugin_id, site_id);