Zerango editorial · October 16, 2026

A practical backend path with PostgreSQL and Supabase

Build the data model, authentication and ownership checks before connecting the interface.

Model the problem

Start with users, records and ownership. Draw the relationships and choose constraints for required values, unique records and valid references. Practice joins and transactions before putting every operation into application code.

Authentication and authorization

Signing in identifies a user; it does not by itself protect every row. In Supabase, enable row level security on exposed tables and write policies for each operation. Base ownership rules on the authenticated user id rather than an id supplied by the form.

Build a narrow API

Validate the request on the server, return a useful error and give the client only the data it needs. Keep privileged service credentials on the server. A public key is usable only together with appropriate database grants and policies.

Test two accounts

Create two test users and verify reading, inserting, updating and deleting their records. Also try an unauthenticated request and a changed owner id. A successful form submission is only one of these checks.

Ship a reproducible exercise

Finish with a small reading tracker: a migration, a seed file, sign-in, a private list and a deployment guide. Document which operations are public and why. This gives you a concrete backend project to review and improve.

Reviewed: October 16, 2026