Can n8n isolate data in the form of a login account?

Can n8n isolate data in the form of a login account?

My side is going to use n8n for different people, and I hope to isolate it by account. How to achieve it?

What you are describing sounds like user management which does not exist yet. You can find the feature request with some information here:

The only thing you can do in the meantime is to run one n8n instance per user.

I added the userid field to distinguish it from the database level