DrydockLogGarbageCollector.php
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			<?php

			final class DrydockLogGarbageCollector
			extends PhabricatorGarbageCollector {

			const COLLECTORCONST = 'drydock.logs';

			public function getCollectorName() {
			return pht('Drydock Logs');
			}

			public function getDefaultRetentionPolicy() {
			return phutil_units('30 days in seconds');
			}

			public function collectGarbage() {
			$log_table = new DrydockLog();
			$conn_w = $log_table->establishConnection('w');

			$now = PhabricatorTime::getNow();
			$ttl = phutil_units('30 days in seconds');

			queryfx(
			$conn_w,
			'DELETE FROM %T WHERE epoch <= %d LIMIT 100',
			$log_table->getTableName(),
			$now - $ttl);

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

			}

phab/src/applications/drydock/garbagecollector/DrydockLogGarbageCollector.php878a493301d2stable