Question
The option Remove Database is grayed out at Plesk > Domains > wordpress.tld > Databases
Why cannot a database marked as Used by an installed web app be marked for deletion?
Answer
Databases marked as Used by an installed web app are created automatically with a web application (such as WordPress, Joomla, Drupal, etc.).
It is not possible to delete these databases separately from a web application.
The only possible way is to remove a whole web application:
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Remove the application in Subscriptions > example.com > Applications.