The article details Timescale's journey to optimize upsert performance on compressed hypertables in TimescaleDB, a PostgreSQL extension. It describes how the team addressed a customer's challenge with suboptimal upsert performance, ultimately achieving a 300x speed improvement by leveraging existing indexes for efficient conflict resolution during upserts on high-cardinality datasets.

https://www.timescale.com/blog/how-we-made-postgresql-upserts-300x-faster-on-compressed-data

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