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(Cannot access the database)

Backtrace:

#0 /var/www/html/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1134): Wikimedia\Rdbms\Database->reportConnectionError('Connection refu...')
#1 /var/www/html/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(749): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#2 /var/www/html/mediawiki/includes/page/WikiPage.php(437): Wikimedia\Rdbms\LoadBalancer->getConnection(0)
#3 /var/www/html/mediawiki/includes/page/WikiPage.php(522): WikiPage->loadPageData()
#4 /var/www/html/mediawiki/includes/page/WikiPage.php(563): WikiPage->exists()
#5 /var/www/html/mediawiki/includes/page/WikiPage.php(229): WikiPage->getContentModel()
#6 /var/www/html/mediawiki/includes/page/WikiPage.php(216): WikiPage->getContentHandler()
#7 /var/www/html/mediawiki/includes/actions/Action.php(96): WikiPage->getActionOverrides()
#8 /var/www/html/mediawiki/includes/actions/Action.php(154): Action::factory('view', Object(WikiPage), Object(RequestContext))
#9 /var/www/html/mediawiki/includes/MediaWiki.php(156): Action::getActionName(Object(RequestContext))
#10 /var/www/html/mediawiki/includes/MediaWiki.php(778): MediaWiki->getAction()
#11 /var/www/html/mediawiki/includes/MediaWiki.php(524): MediaWiki->main()
#12 /var/www/html/mediawiki/index.php(42): MediaWiki->run()
#13 {main}

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