I upgraded my modules by calling
composer update, then my shop was going offline with the message:
Please upgrade your database: Run "bin/magento setup:upgrade" from the Magento root directory.
Is this showing because my magento is in "developer" mode? Will this exception also show if I am in "production" mode?
I fear that I can only update my modules in 4:30 o'clock in the morning when there is almost no traffic on my shop.