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MetaMTAMailReceivedGarbageCollector.php
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			<?php

			final class MetaMTAMailReceivedGarbageCollector
			extends PhabricatorGarbageCollector {

			const COLLECTORCONST = 'metamta.received';

			public function getCollectorName() {
			return pht('Mail (Received)');
			}

			public function getDefaultRetentionPolicy() {
			return phutil_units('90 days in seconds');
			}

			protected function collectGarbage() {
			$table = new PhabricatorMetaMTAReceivedMail();
			$conn_w = $table->establishConnection('w');

			queryfx(
			$conn_w,
			'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
			$table->getTableName(),
			$this->getGarbageEpoch());

			return ($conn_w->getAffectedRows() == 100);
			}

			}