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PhabricatorFactManagementDestroyWorkflow.php
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			<?php

			final class PhabricatorFactManagementDestroyWorkflow
			extends PhabricatorFactManagementWorkflow {

			protected function didConstruct() {
			$this
			->setName('destroy')
			->setSynopsis(pht('Destroy all facts.'))
			->setArguments(array());
			}

			public function execute(PhutilArgumentParser $args) {
			$console = PhutilConsole::getConsole();

			$question = pht(
			'Really destroy all facts? They will need to be rebuilt through '.
			'analysis, which may take some time.');

			$ok = $console->confirm($question, $default = false);
			if (!$ok) {
			return 1;
			}

			$tables = array();
			$tables[] = new PhabricatorFactCursor();

			$tables[] = new PhabricatorFactIntDatapoint();

			$tables[] = new PhabricatorFactObjectDimension();
			$tables[] = new PhabricatorFactKeyDimension();

			foreach ($tables as $table) {
			$conn = $table->establishConnection('w');
			$name = $table->getTableName();

			$console->writeOut("%s\n", pht("Destroying table '%s'...", $name));

			queryfx(
			$conn,
			'TRUNCATE TABLE %T',
			$name);
			}

			$console->writeOut("%s\n", pht('Done.'));
			}

			}