WClickHouse library brings fast upserts to ClickHouse using ReplacingMergeTree

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WClickHouse, an open-source Python library, enables efficient upsert operations in ClickHouse without relying on slow SQL UPDATE mutations. The library leverages ClickHouse's ReplacingMergeTree engine, which deduplicates records in the background using a version column, keeping writes fast. Developers can query the latest state of records using the FINAL modifier, avoiding outdated results in analytical queries. The tool is designed to handle streaming event pipelines where duplicate state updates are common. WClickHouse supports Python 3.9 through 3.14, integrates with Apache Arrow and Pydantic v2, and is available on both GitHub and PyPI.

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