Platform 3 · Backend & API Modules
API Fixture Freight: 150 Mock APIs
built by Kadri Tamm
All levels 150 files 381 aboard
Open fare
€1–€100
Backend & API Modules
All levels
Line KJ-141 Platform 3 · Backend & API Modules
SQL Schema Sidings: 60 Production Schemas
Sixty reviewed PostgreSQL schemas for common business domains, with migrations, indexes and sample queries.
298
builders
LH Maintained by Lars Holm
- Last updated October 2026
- English
- 25m of walkthroughs
- 60 files
What you get
5 items in the boxEvery bullet below is in the download, working, the moment your payment clears.
- 60 PostgreSQL schemas for common domains
- Migrations, diagrams and indexes for each
- Constraints that enforce business rules in the database
- Written trade-off notes per schema
- Pay any fare from €1 to €100 — each euro unlocks about 0.6 schemas
What's in the box
6 parts · 60 files · 25m of walkthroughs
10 files with a 3m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
10 files with a 4m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
10 files with a 5m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
10 files with a 6m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
10 files with a 3m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
10 files with a 4m walkthrough video. This part is documented in the architecture guide, with notes on every decision and how to change it for your own project.
The full file tree and the walkthroughs are in your download, available straight after checkout.
6 parts · 60 files
25m total length
You will need
Short list, and deliberately so. If you meet these you can start today.
- PostgreSQL 15 or newer
About this product
Data models are expensive to change after launch. Schema Sidings is sixty PostgreSQL schemas for domains that come up again and again — bookings with overlapping reservations, double-entry ledgers, inventory with reservations, subscriptions, audit trails, multi-currency pricing, permissions — each reviewed for the mistakes that hurt in year two.
Every schema ships as migrations, an entity diagram, the indexes its main queries need, constraints that enforce the business rules, and a page explaining the trade-offs. Your fare unlocks domains in the listed order.
You choose the fare: anything from €1 to €100, in whole euros. At €100 you get every part, plus all future additions to it.
Topics covered
Frequently asked questions
Still unsure about something? Write to our contact page and a human answers, usually the same working day.
Pick any whole-euro fare from €1 to €100. Each euro unlocks about 0.6 schemas, and parts unlock in the order listed on this page, so you see exactly what your fare includes before you pay.
No. New schemas added to the parts you have unlocked appear behind the same download link at no extra cost.
Checkout is handled on our provider's secure payment page. The moment your payment clears we email your personal access link and access code to the address you used at checkout, and the same link appears in your account library. There is nothing to install and nothing to wait for.
Email within 14 days of your purchase, quote your order number, and we refund the full amount to your original payment method. No form to fill in and no questions about how much of the product you watched.
What builders say
No reviews yet
Nobody has reviewed this product yet, so there is no score to show. Buy it, work through it, and your review could be the one that helps the next developer decide.
Your maker
LH
Lars Holm
Go and Rust engineer with a security habit
- 2,427 builders aboard
- 11 products published
- 5.0 maker rating
- Go
- Rust
- PostgreSQL
- Application security
- Linux hardening
Lars started out in penetration testing and moved into backend engineering, so he writes Go services the way an attacker would read them. He maintains the Go API and Postgres tenancy modules and the whole Security line. His audit kits explain the reason behind every check, because a checklist nobody understands gets skipped.