We just made PostHog Open Source 1000x more scalable via ClickHouse

PostHog is transitioning its Open Source platform from PostgreSQL to ClickHouse to overcome scalability limitations and improve performance, allowing for free usage without a 10k monthly active user cap. ClickHouse is chosen for its ability to handle large data volumes efficiently, offering faster query responses and cost-effective scalability through its columnar database structure. The migration to ClickHouse is facilitated by its advanced engine, enabling swift data transfers and easier future migrations between PostHog Cloud and Self Hosted versions. Although ClickHouse will manage telemetry and event data, PostgreSQL will still be used for frequently updated data management, such as user information, maintaining it as the source of truth while ClickHouse updates are made. The deployment of ClickHouse is straightforward due to its single-binary setup, and its native replication ensures fault tolerance, supported by extensive documentation from Altinity.

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