Which database to choose for Node.js+socket.io?

Question

Node.js

Good day everyone :) I started learning Node. I want to make a complete system. Actually, something like this structure:
1. The user enters one of the pages of the site, sends data to the server, he uploads them to the admin panel, and so on with each user. data in DB No. 1. What database to use for Node?)
2. When the admin enters the admin panel to which DB No. 1 is attached, he sees all the data that users sent him for publication. And now he can approve / reject the publication. (in case of rejection, the data is simply deleted from DB No. 1, and in case of approval, it is deleted from DB No. 1 and written to DB No. 2, which is linked to the main page of the site.
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3. Is it advisable to replace the database with regular jade templates here?
4. Will Node.js handle 100-200 requests at once?
5. Which cms is a good fit for Node.js?

Answer 1

1. Which one do you like better. (I like Mongo, but I use Postgres)
2. The task does not require 2 databases
3. If you replace the database with a markup language and it makes at least some sense, I will quit development forever and go to Tibet
4. Well yes, like
5. Working with Nodejs

Answer 2

1. There are many packages: mysql, mongo, etc.
2. What is the question?
3. Replace the database with a template engine? wat?
4. habrahabr.ru/post/123154
5. There are only a few of them. blog.innovsystems.com/nodejs/best-nodejs-cms