# Clusterity

> Clusterity s.r.o. is a small PostgreSQL practice in the Czech Republic, working globally. It trains engineering teams to review database changes before they reach production, and builds the products and open-source tools that apply the same judgment every day. Clusterity is the company behind boringSQL.

Anyone can write SQL now. Knowing which queries survive production is the hard part.

Founder: Radim Marek. Contact: hello@clusterity.com. Book a 30-minute diagnostic call: https://calendar.app.google/Sg74QbkrpW7LWYHm7

## Services

- [Annual Training Program](https://www.clusterity.com/#services): a year-long track per team. Starts with a diagnostic call and a baseline from at least three dryrun snapshots of the team's schema, planner and workload. Four quarterly workshops (the first a fixed foundations curriculum, the rest defined on the gaps found), full SQL Labs access, monthly office hours, and a re-test with a written report at month twelve. From EUR 12,000 per year for a team of up to 8 engineers, plus EUR 900 per additional engineer. Prices exclude VAT.
- [Workshops](https://www.clusterity.com/#services): half-day (EUR 2,500) or full-day (EUR 4,000) for your team of up to 8 engineers, on-site or remote. Topics include migration safety and lock-aware DDL, reading query plans, and reviewing AI-generated SQL.

## Products

- [Hindsight](https://www.clusterity.com/#tools): hosted PostgreSQL snapshot and insight engine. Push schema and planner snapshots from CI or a laptop; findings the whole team can see and comment on. A snapshot is DDL, planner statistics and activity counters; no rows, no credentials. Commercial, pricing on request.
- [SQL Labs](https://labs.boringsql.com/): hands-on PostgreSQL labs on production-scale data, scored and repeatable, drawn from real incidents. Solo EUR 495 per year, team from EUR 1,990 per year. Included in the annual program.

## Open source

- [dryrun](https://github.com/boringSQL/dryrun): PostgreSQL schema intelligence for AI agents and CI, as an MCP server and CLI. Production planner behavior, portable, no database credentials.
- [RegreSQL](https://github.com/boringSQL/regresql): query regression testing. Captures expected output and EXPLAIN costs, catches drift before it becomes an incident.
- [Fixturize](https://github.com/boringSQL/fixturize): production-faithful, foreign-key-consistent, PII-masked test data.

## Writing

- [boringSQL](https://boringsql.com/): vendor-neutral PostgreSQL internals and production patterns. No vendors, no products, no pitch. Feed: https://boringsql.com/atom.xml
- [Field notes](https://www.clusterity.com/notes/): Clusterity's own notes. Vendor-specific and commercial: vendor specific, managed offerings, our tools, engagements. Feed: https://www.clusterity.com/notes/atom.xml

## Company

- Clusterity s.r.o., Regus, D1 Říčany, Obchodní 1623/14, 251 01 Říčany u Prahy, Czech Republic. Registered in the Czech Republic, Commercial Registry at the Municipal Court in Prague, section C, insert 225570. VAT payer.
- [LinkedIn](https://www.linkedin.com/in/1radim/)
- [GitHub](https://github.com/boringSQL)