julienlg nevermind, I got it. Here's the error:
flarum.ERROR: PDOException: SQLSTATE[42000]: Syntax error or access violation: 1118 Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs in /app/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:112
Stack trace:
#0 /app/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(112): PDOStatement->execute()
#1 /app/vendor/illuminate/database/Connection.php(463): Doctrine\DBAL\Driver\PDOStatement->execute()
#2 /app/vendor/illuminate/database/Connection.php(662): Illuminate\Database\Connection->Illuminate\Database\{closure}()
#3 /app/vendor/illuminate/database/Connection.php(629): Illuminate\Database\Connection->runQueryCallback()
#4 /app/vendor/illuminate/database/Connection.php(464): Illuminate\Database\Connection->run()
#5 /app/vendor/illuminate/database/Schema/Blueprint.php(97): Illuminate\Database\Connection->statement()
#6 /app/vendor/illuminate/database/Schema/Builder.php(290): Illuminate\Database\Schema\Blueprint->build()
#7 /app/vendor/illuminate/database/Schema/Builder.php(151): Illuminate\Database\Schema\Builder->build()
#8 /app/vendor/flarum/core/src/Database/Migration.php(67): Illuminate\Database\Schema\Builder->table()
#9 [internal function]: Flarum\Database\Migration::Flarum\Database\{closure}()
#10 /app/vendor/flarum/core/src/Database/Migrator.php(197): call_user_func()
#11 /app/vendor/flarum/core/src/Database/Migrator.php(128): Flarum\Database\Migrator->runClosureMigration()
#12 /app/vendor/flarum/core/src/Database/Migrator.php(111): Flarum\Database\Migrator->runUp()
#13 /app/vendor/flarum/core/src/Database/Migrator.php(85): Flarum\Database\Migrator->runMigrationList()
#14 /app/vendor/flarum/core/src/Extension/Extension.php(438): Flarum\Database\Migrator->run()
#15 /app/vendor/flarum/core/src/Extension/ExtensionManager.php(283): Flarum\Extension\Extension->migrate()
#16 /app/vendor/flarum/core/src/Extension/ExtensionManager.php(164): Flarum\Extension\ExtensionManager->migrate()
#17 /app/vendor/flarum/core/src/Api/Controller/UpdateExtensionController.php(45): Flarum\Extension\ExtensionManager->enable()
#18 /app/vendor/flarum/core/src/Http/RouteHandlerFactory.php(38): Flarum\Api\Controller\UpdateExtensionController->handle()
#19 /app/vendor/flarum/core/src/Http/Middleware/ExecuteRoute.php(27): Flarum\Http\RouteHandlerFactory->Flarum\Http\{closure}()
#20 /app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ExecuteRoute->process(
It's probably related to https://stackoverflow.com/questions/22637733
Since I am unsure whether this has bugged out because of the full disk problem earlier this day, or it's a bug in the Money extension, I will try to tweak our configuration or see if it works on my forum
Edit: It does work on my forum. If it still doesn't work for you, I could restore a backup of your forum database to see if it helps, in case it bugged out when the disk was full?