HeraldTranscriptGarbageCollector.php
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	<?php

	final class HeraldTranscriptGarbageCollector
	extends PhabricatorGarbageCollector {

	public function collectGarbage() {
	$ttl = PhabricatorEnv::getEnvConfig('gcdaemon.ttl.herald-transcripts');
	if ($ttl <= 0) {
	return false;
	}

	$table = new HeraldTranscript();
	$conn_w = $table->establishConnection('w');

	queryfx(
	$conn_w,
	'UPDATE %T SET
	objectTranscript = "",
	ruleTranscripts = "",
	conditionTranscripts = "",
	applyTranscripts = "",
	garbageCollected = 1
	WHERE garbageCollected = 0 AND `time` < %d
	LIMIT 100',
	$table->getTableName(),
	time() - $ttl);

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

	}