◆ welldun software × AI

Notebook / Series

Drafting Table

Building a multi-tenant platform where every customer designs their own database — the entity platform.

Building a platform where customers design their own database

Why we're building a 'define-your-own-data' platform — and what this series will cover.

5 min
Jun 26, 2026 01

One engine, many schemas

The core bet: a registry as source of truth, JSON for storage, and generated SQL views on top.

8 min
Jun 26, 2026 02

Keeping tenants apart with Row-Level Security

How Postgres makes data isolation a property of the database — and the view gotcha that nearly leaked everything.

8 min
Jun 26, 2026 03

Unique keys and foreign keys… on JSON

How to enforce real constraints and relationships when the data lives in a JSON blob and the schema was invented by a user.

9 min
Jun 26, 2026 04

What a load test taught us

A bottleneck we couldn't see, a 400ms query that became 0.3ms, and why 'a lot of data' isn't the same as 'slow.'

9 min
Jun 26, 2026

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