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Identifying users in the backend

Is there a proper way of identifying users in my backend? I’m already authenticating users through auth0’s custom database feature.

So that means a “users” table is created and the users who created an account their “user_id” and “email” get added to my database. Thanks to Auth0’s custom database feature.

I’ve tried using my “user_id” as a foreign key but it doesn’t display any of my information Example: education table with the school name, school city and state. It only displays the information that was entered through Auth0 when creating an account “user_id”, “email”.