Try waiting a few minutes and reloading.
(Cannot access the database: Unknown error (localhost))
Backtrace:
#0 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(937): Wikimedia\Rdbms\LoadBalancer->reportConnectionError() #1 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(904): Wikimedia\Rdbms\LoadBalancer->getServerConnection() #2 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1049): Wikimedia\Rdbms\LoadBalancer->getConnection() #3 /var/www/production/w/includes/GlobalFunctions.php(2463): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef() #4 /var/www/production/w/includes/cache/localisation/LCStoreDB.php(56): wfGetDB() #5 /var/www/production/w/includes/cache/localisation/LocalisationCache.php(449): LCStoreDB->get() #6 /var/www/production/w/includes/cache/localisation/LocalisationCache.php(495): LocalisationCache->isExpired() #7 /var/www/production/w/includes/cache/localisation/LocalisationCache.php(414): LocalisationCache->initLanguage() #8 /var/www/production/w/includes/cache/localisation/LocalisationCache.php(333): LocalisationCache->loadSubitem() #9 /var/www/production/w/languages/Language.php(2645): LocalisationCache->getSubitem() #10 /var/www/production/w/includes/cache/MessageCache.php(1047): Language->getMessage() #11 /var/www/production/w/includes/cache/MessageCache.php(1005): MessageCache->getMessageForLang() #12 /var/www/production/w/includes/cache/MessageCache.php(947): MessageCache->getMessageFromFallbackChain() #13 /var/www/production/w/includes/language/Message.php(1320): MessageCache->get() #14 /var/www/production/w/includes/language/Message.php(878): Message->fetchMessage() #15 /var/www/production/w/includes/language/Message.php(970): Message->toString() #16 /var/www/production/w/includes/api/ApiErrorFormatter_BackCompat.php(90): Message->text() #17 /var/www/production/w/includes/api/ApiErrorFormatter.php(149): ApiErrorFormatter_BackCompat->addWarningOrError() #18 /var/www/production/w/includes/api/ApiMain.php(1080): ApiErrorFormatter->addError() #19 /var/www/production/w/includes/api/ApiMain.php(591): ApiMain->substituteResultWithError() #20 /var/www/production/w/includes/api/ApiMain.php(536): ApiMain->handleException() #21 /var/www/production/w/includes/api/ApiMain.php(500): ApiMain->executeActionWithErrorHandling() #22 /var/www/production/w/api.php(90): ApiMain->execute() #23 /var/www/production/w/api.php(45): wfApiMain() #24 {main}