Add request_queue table and user_group.join_policy column, for upcoming join & subscription moderation.

UI for setting the join policy is in, but not yet used.

classes/Request_queue.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * Table Definition for request_queue
+ */
+require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
+
+class Request_queue extends Managed_DataObject
+{
+    ###START_AUTOCODE
+    /* the code below is auto generated do not remove the above tag */
+
+    public $__table = 'request_queue';       // table name
+    public $subscriber;
+    public $subscribed;
+    public $group_id;
+    public $created;
+
+    /* Static get */
+    function staticGet($k,$v=null)
+    { return Memcached_DataObject::staticGet('Confirm_address',$k,$v); }
+
+    /* the code above is auto generated do not remove the tag below */
+    ###END_AUTOCODE
+
+    public static function schemaDef()
+    {
+        return array(
+            'description' => 'Holder for subscription & group join requests awaiting moderation.',
+            'fields' => array(
+                'subscriber' => array('type' => 'int', 'not null' => true, 'description' => 'remote or local profile making the request'),
+                'subscribed' => array('type' => 'int', 'description' => 'remote or local profile to subscribe to, if any'),
+                'group_id' => array('type' => 'int', 'description' => 'remote or local group to join, if any'),
+                'created' => array('type' => 'datetime', 'not null' => true, 'description' => 'date this record was created'),
+            ),
+            'unique key' => array(
+                'request_queue_subscriber_subscribed_group_id' => array('subscriber', 'subscribed', 'group_id'),
+            ),
+            'indexes' => array(
+                'request_queue_subscriber_created_idx' => array('subscriber', 'created'),
+                'request_queue_subscribed_created_idx' => array('subscriber', 'created'),
+                'request_queue_group_id_created_idx' => array('group_id', 'created'),
+            ),
+            'foreign keys' => array(
+                'request_queue_subscriber_fkey' => array('profile', array('subscriber' => 'id')),
+                'request_queue_subscribed_fkey' => array('profile', array('subscribed' => 'id')),
+                'request_queue_group_id_fkey' => array('user_group', array('group_id' => 'id')),
+            )
+        );
+    }
+}