I already asked something like that here: Outsource Credentials
Sadly for us (because I would really love to use n8n in production) there is no official way to store credentials outside of the n8n application itself or pull them via a special node.
That’s, alone from a security-standpoint, not feasible in production. Credentials should be stored in a central storage and not be distributed wildly in different applications. I think every reasonably big company will agree.
Another obvious problem would be the missing User/Role-Management (only basic auth is a little bit too little) but we could live with that temporarily.