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(Cannot access the database)

Backtrace:

#0 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(972): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(944): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(95): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal()
#3 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(101): Wikimedia\Rdbms\DBConnRef->ensureConnection()
#4 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(344): Wikimedia\Rdbms\DBConnRef->__call()
#5 /usr/share/mediawiki/includes/page/WikiPage.php(402): Wikimedia\Rdbms\DBConnRef->selectRow()
#6 /usr/share/mediawiki/includes/page/WikiPage.php(430): WikiPage->pageData()
#7 /usr/share/mediawiki/includes/page/WikiPage.php(470): WikiPage->pageDataFromTitle()
#8 /usr/share/mediawiki/includes/page/WikiPage.php(587): WikiPage->loadPageData()
#9 /usr/share/mediawiki/includes/page/WikiPage.php(661): WikiPage->exists()
#10 /usr/share/mediawiki/includes/page/WikiPage.php(296): WikiPage->getContentModel()
#11 /usr/share/mediawiki/includes/MediaWiki.php(437): WikiPage->getContentHandler()
#12 /usr/share/mediawiki/includes/MediaWiki.php(320): MediaWiki->initializeArticle()
#13 /usr/share/mediawiki/includes/MediaWiki.php(904): MediaWiki->performRequest()
#14 /usr/share/mediawiki/includes/MediaWiki.php(562): MediaWiki->main()
#15 /usr/share/mediawiki/index.php(50): MediaWiki->run()
#16 /usr/share/mediawiki/index.php(46): wfIndexMain()
#17 {main}