PostgreSQL Production API

Build a Go HTTP service over Postgres the way it is actually operated: a real pool, timeouts, migrations and indexes — one small change at a time.

A toy SELECT 1 demo teaches nothing about the night Postgres falls over. Here we build a small Go service over Postgres and add, step by tiny step, the things that decide whether it survives load: a connection pool sized on purpose, statement and request timeouts, migrations applied on boot, and the right indexes. Each page is one delta with a short note on why it matters — and what incident it prevents.

What you'll build

• Serve HTTP from Go with a Postgres-backed handler
• Manage a connection pool with sane limits
• Apply SQL migrations on startup
• Protect the service with statement and request timeouts
• Index the columns your queries actually filter on

Contents

1. An empty Go module
2. A database to talk to
3. The smallest HTTP surface
4. Make it serve
5. Reach for a pool, not a connection
6. Connect at boot, fail loud
7. A health check that tells the truth
8. Schema as a migration
9. A tiny migration runner
10. Migrate before serving
11. Give the database a typed home
12. Insert an order
13. Read an order back
14. Expose order creation
15. And reading one back
16. Wire the routes together
17. Size the pool on purpose
18. Stop runaway queries
19. Index what you filter on
20. Timeouts on the HTTP side too