PipelineDB

Continuous queries update materialized views in real-time without manual REFRESH commands, as shown in the example where INSERTs immediately aggregate data into test_view.

Raw data is never written to disk, minimizing storage overhead for high-volume time-series workloads and focusing only on aggregated results, as emphasized in the README.

It runs as a PostgreSQL extension, allowing use of standard SQL tools like psql and compatibility with existing ecosystems, demonstrated in the streaming and querying examples.

Output streams enable chaining continuous queries into networks for complex analytics pipelines, supported by features like continuous transforms as documented.