Site hard hang after failed(?) module update.

[askleo]

Had freescout working and working well at support.askleo.com. (EC2, Ubuntu server)
Went to the modules page and attempted and "Update" on the first module needing one. Sat for minutes. No activity other than greying out the update button.
Hit "Update" on another. Same thing.

Now the site is completely unresponsive. NO action. I either get 504 gateway timeouts, or (after moving the contents of the Modules folder somewhere else) "Whoops, looks like something went wrong — check logs in /storage/logs". I've rebooted the server with no effect.

Error in laravel-2022-11-12.log appended below.

How do I fix this? (And what other information can I provide? Freescout UI is now completely unavailable to me.

[2022-11-12 15:21:01] production.ERROR: SQLSTATE[HY000] [2002] Connection timed out (SQL: insert into modules (alias, active) values (apiwebhooks, 0)) {"exception":"[object] (Illuminate\Database\QueryException(code: 2002): SQLSTATE[HY000] [2002] Connection timed out (SQL: insert into modules (alias, active) values (apiwebhooks, 0)) at /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Connection.php:664, Doctrine\DBAL\Driver\PDO\Exception(code: 2002): SQLSTATE[HY000] [2002] Connection timed out at /data/support/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDO/Exception.php:18, PDOException(code: 2002): SQLSTATE[HY000] [2002] Connection timed out at /data/support/public_html/overrides/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:38)
[stacktrace]
#0 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Connection.php(624): Illuminate\Database\Connection->runQueryCallback()
#1 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Connection.php(459): Illuminate\Database\Connection->run()
#2 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Connection.php(411): Illuminate\Database\Connection->statement()
#3 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Query/Processors/Processor.php(32): Illuminate\Database\Connection->insert()
#4 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Query/Builder.php(2159): Illuminate\Database\Query\Processors\Processor->processInsertGetId()
#5 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php(1285): Illuminate\Database\Query\Builder->insertGetId()
#6 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(722): Illuminate\Database\Eloquent\Builder->__call()
#7 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(687): Illuminate\Database\Eloquent\Model->insertAndSetId()
#8 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Database/Eloquent/Model.php(550): Illuminate\Database\Eloquent\Model->performInsert()
#9 /data/support/public_html/app/Module.php(51): Illuminate\Database\Eloquent\Model->save()
#10 /data/support/public_html/app/Module.php(155): App\Module::setActive()
#11 /data/support/public_html/app/Providers/AppServiceProvider.php(78): App\Module::deactiveModule()
#12 [internal function]: App\Providers\AppServiceProvider->App\Providers\{closure}()
#13 /data/support/public_html/overrides/tormjens/eventy/src/Filter.php(28): call_user_func_array()
#14 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Support/Collection.php(339): TorMorten\Eventy\Filter->TorMorten\Eventy\{closure}()
#15 /data/support/public_html/overrides/tormjens/eventy/src/Filter.php(29): Illuminate\Support\Collection->each()
#16 /data/support/public_html/vendor/tormjens/eventy/src/Events.php(163): TorMorten\Eventy\Filter->fire()
#17 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(221): TorMorten\Eventy\Events->filter()
#18 /data/support/public_html/overrides/nwidart/laravel-modules/src/Module.php(331): Illuminate\Support\Facades\Facade::__callStatic()
#19 /data/support/public_html/overrides/nwidart/laravel-modules/src/Module.php(288): Nwidart\Modules\Module->registerFiles()
#20 /data/support/public_html/overrides/nwidart/laravel-modules/src/Repository.php(366): Nwidart\Modules\Module->register()
#21 /data/support/public_html/vendor/nwidart/laravel-modules/src/Providers/BootstrapServiceProvider.php(22): Nwidart\Modules\Repository->register()
#22 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(586): Nwidart\Modules\Providers\BootstrapServiceProvider->register()
#23 /data/support/public_html/vendor/nwidart/laravel-modules/src/ModulesServiceProvider.php(38): Illuminate\Foundation\Application->register()
#24 /data/support/public_html/vendor/nwidart/laravel-modules/src/LaravelModulesServiceProvider.php(15): Nwidart\Modules\ModulesServiceProvider->registerModules()
#25 [internal function]: Nwidart\Modules\LaravelModulesServiceProvider->boot()
#26 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Container/BoundMethod.php(29): call_user_func_array()
#27 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Container/BoundMethod.php(87): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#28 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Container/BoundMethod.php(31): Illuminate\Container\BoundMethod::callBoundMethod()
#29 /data/support/public_html/overrides/laravel/framework/src/Illuminate/Container/Container.php(549): Illuminate\Container\BoundMethod::call()
#30 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(792): Illuminate\Container\Container->call()
#31 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(775): Illuminate\Foundation\Application->bootProvider()
#32 [internal function]: Illuminate\Foundation\Application->Illuminate\Foundation\{closure}()
#33 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(776): array_walk()
#34 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/BootProviders.php(17): Illuminate\Foundation\Application->boot()
#35 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(213): Illuminate\Foundation\Bootstrap\BootProviders->bootstrap()
#36 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(296): Illuminate\Foundation\Application->bootstrapWith()
#37 /data/support/public_html/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(119): Illuminate\Foundation\Console\Kernel->bootstrap()
#38 /data/support/public_html/artisan(62): Illuminate\Foundation\Console\Kernel->handle()
#39 {main}
"}

[askleo]

OK, somehow a database configuration setting had been reverted to a prior value. No idea why. I think I'm working again.

[freescout-helpdesk]

Connection timed out - it looks like you had some issues with DB.