Building an E-commerce Backend: Auth, Cart, and Transactional Orders with Prisma

Short summary

A tutorial on building an e-commerce backend with Express, Prisma, and PostgreSQL covering auth, cart, and transactional order placement. Key design decisions include snapshotting OrderItem.price at purchase time to prevent historical order corruption, using a compound unique constraint on CartItem for clean upserts, and baking user role into the JWT payload for self-contained authorization without database lookups.

• •OrderItem.price must be a snapshot, not a reference to Product.price
• •CartItem compound unique constraint enables clean upserts via Prisma
• •JWT payload should include role for self-contained authorization

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