Datahike

Serialization considered boring August 2026 Open a 34-megabyte value in a konserve store. Change one number buried deep inside it: Superficie Clojure a class="co...

Data governance in versioned systems May 2026 If a database remembers everything, how do you delete things? The question arises in right-to-erasure requests, accidental ingestion of personal data and retention policies. An immutable system needs an explic

Branches as values, merges as queries May 2026 Snapshotting via copy-on-write is a well-trodden idea. ZFS and btrfs do it at the filesystem block layer. Neon and Aurora do it at the database page layer. Datomic and Datahike do it at the data-model layer.

Datahike speaks PostgreSQL May 2026 Open psql. Connect. Run a query. Switch branches. Run it again, same connection, same wire protocol, different version of the database. $ psql postgresql: span style="col...

Anomaly detection inside the database Analytical databases already hold the rows used to detect outliers. In many systems, however, the detection itself happens somewhere else. A common workflow queries a warehouse, moves the result into a DataFrame, fits

Versioned analytics for regulated industries Financial regulation ( Basel III , MiFID II , Solvency II , a href="https://www.congress.gov/bill/107th-congress/house-bill/3...

Memory that collaborates March 2026 When two teams need to combine data, the usual answer is infrastructure: an ETL pipeline, an API, a message bus. Each adds latency, maintenance burden, and a new failure mode. The data moves because the systems can't sh

Columnar SQL engine for the JVM with copy-on-write tables, historical snapshots and a PostgreSQL-compatible wire protocol.

Stratum: SQL that branches A few years ago I hit a wall I suspect many data engineers know. I had a million-row analytical dataset and I wanted to run an experiment: modify a few pricing assumptions, re-run a set of aggregation queries, compare the result

Why we built Datahike February 2026 I've been working toward this for over a decade. It started with Votorola - collaborative liquid democracy software - where I first needed to distribute a memory model across systems. That led me to Clojure, which led m