Avoid ordering just by a timestamp
Try to also employ an id when possible. Involves reworking some of the indices.
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		@@ -1,58 +1,46 @@
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<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * StatusNet - the distributed open-source microblogging tool
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 * Copyright (C) 2010, StatusNet, Inc.
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 *
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 * Plugin to throttle subscriptions by a user
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 *
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 * PHP version 5
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU Affero General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU Affero General Public License for more details.
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 *
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 * You should have received a copy of the GNU Affero General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 * @category  Throttle
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 * @package   StatusNet
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 * @package   GNUsocial
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 * @author    Evan Prodromou <evan@status.net>
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 * @copyright 2010 StatusNet, Inc.
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 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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 * @link      http://status.net/
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 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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 */
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if (!defined('STATUSNET')) {
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    // This check helps protect against security problems;
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    // your code file can't be executed directly from the web.
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    exit(1);
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}
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defined('GNUSOCIAL') || die();
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/**
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 * Subscription throttle
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 *
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 * @category  Throttle
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 * @package   StatusNet
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 * @package   GNUsocial
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 * @author    Evan Prodromou <evan@status.net>
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 * @copyright 2010 StatusNet, Inc.
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 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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 * @link      http://status.net/
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 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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 */
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class SubscriptionThrottlePlugin extends Plugin
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{
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    const PLUGIN_VERSION = '2.0.0';
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    public $subLimits = array(86400 => 100,
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                              3600 => 50);
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    public $groupLimits = array(86400 => 50,
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                                3600 => 25);
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    public $subLimits   = [86400 => 100, 3600 => 50];
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    public $groupLimits = [86400 => 50,  3600 => 25];
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    /**
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     * Filter subscriptions to see if they're coming too fast.
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@@ -62,7 +50,7 @@ class SubscriptionThrottlePlugin extends Plugin
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     *
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     * @return boolean hook value
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     */
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    function onStartSubscribe(Profile $profile, $other)
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    public function onStartSubscribe(Profile $profile, $other)
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    {
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        foreach ($this->subLimits as $seconds => $limit) {
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            $sub = $this->_getNthSub($profile, $limit);
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@@ -88,12 +76,11 @@ class SubscriptionThrottlePlugin extends Plugin
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     *
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     * @return boolean hook value
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     */
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    function onStartJoinGroup($group, $profile)
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    public function onStartJoinGroup($group, $profile)
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    {
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        foreach ($this->groupLimits as $seconds => $limit) {
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            $mem = $this->_getNthMem($profile, $limit);
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            if (!empty($mem)) {
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                $jointime = strtotime($mem->created);
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                $now      = time();
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                if ($now - $jointime < $seconds) {
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@@ -142,7 +129,7 @@ class SubscriptionThrottlePlugin extends Plugin
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        $mem = new Group_member();
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        $mem->profile_id = $profile->id;
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        $mem->orderBy('created DESC');
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        $mem->orderBy('created DESC, group_id DESC');
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        $mem->limit($n - 1, 1);
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        if ($mem->find(true)) {
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