I want to change the username of my application

Now you can updated username and password for both Master Credentials and Application Credentials:
https://support.cloudways.com/which-is-the-difference-between-master-credentials-and-application-credentials/

You can also change the database password (please note that you need to update manually the database password in your applications configuration files).

We don't have plans to allow FQDN change (FQDN is just meant for you to point your own domain to via CNAME) nor database name / database username changes. These are core to many platform processes and we can't allow for them to be updated.

Cloudways Team

That's great to hear! Like I said before, just a 1-click solution to change them, would be enough. For security, etc.

I personally don't think its important to be able to customize all these things. In fact, it's one feature of CloudWays I like: you can't do too many things. We complicate things because we can, not because we should. But I think it would be prudent to allow a new app username, password, and MySQL user/pass to be generated, as needed. It doesn't have to be customizeable, just a button to have the server generate a new one. There are instances were security might be in question and it would be a lot easier to just have the server generate new credentials for that app, than to have to clone it, in order to change potentially compromised credentials.

when are you gonna allow this ? its crazy not to

Helps to create stronger passwords having special characters #@! etc.

helpful feature if for example migrate site, so I m joining to this idea

Custom Database Name & Custom folder structure, i.e. I prefer saving WordPress sites in a wordpress folder