Add a small new domain (e.g. bookstore or events)

[sqllocks]

A great way to get started with Spindle is to add a new domain.

What to do

1. Copy domains/_template/ to domains/<your-domain>/
2. Define the entities, attributes, and relationships in the .spindle.json schema
3. Add calibration sources (where the distribution numbers come from — public stats, industry reports, etc.)
4. Add a smoke test that generates ~1,000 rows and asserts FK integrity
5. Add a one-paragraph entry to docs/domains/

Suggested domains

We'd love a small, single-purpose domain to make Spindle more approachable:

• Bookstore — books, authors, customers, orders, reviews
• Events — venues, events, attendees, tickets, sessions
• Library — books, members, loans, returns, holds
• Conference — sessions, speakers, attendees, ratings
• Gym — members, classes, instructors, attendance, equipment

Keep it 5–10 tables max. Statistical realism is the goal — don't use Faker-style randomness.

Why this is a good first issue

• /domains/_template/ is fully documented and ready to copy
• Existing domains in domains/retail/, domains/financial/, etc. are good reference
• No deep knowledge of the generation engine required — you're only defining the schema and distributions
• Self-contained: no breaking changes to existing code

Drop a comment if you start one so we don't collide.