book.kleptsov.com

A self-hosted booking tool built because the SaaS options were either overpriced or creepy with data. It computes availability with the Temporal API so daylight-saving edge cases are correct, and it relies on a Postgres EXCLUDE constraint so two people physically cannot grab the same slot — concurrency safety enforced by the database, not hopeful application code.

Calendar-provider sync (Google, Microsoft 365, CalDAV), email notifications, and a transactional outbox for reliable external writes round it out. This is the page behind every “Book a meeting” button on the site.