LangWatch20 min read
Four Refactors and a Funeral: Migrating a Live System to Event Sourcing
How LangWatch migrated a live platform to event sourcing on ClickHouse: four refactors, a fold-map-react pipeline, and a zero-downtime dual-write cutover.
By Alex Forbes-ReedLangWatch Blog
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Originally published by LangWatch Blog on Apr 20, 2026.
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