WClickHouse Brings Fast Upserts to ClickHouse Using ReplacingMergeTree and FINAL

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WClickHouse, an open-source Python library, introduces a streamlined approach to handling upserts in ClickHouse without relying on slow UPDATE mutations. The library leverages ClickHouse's ReplacingMergeTree engine with a version column, allowing data to be appended quickly while deduplication happens in the background during merges. Developers can query the latest deduplicated state using the FINAL keyword, avoiding stale or duplicate records in analytical queries. The solution is designed to support Python versions 3.9 through 3.14 and integrates with Apache Arrow and Pydantic v2. WClickHouse is available on GitHub and PyPI, and claims over 95% test coverage against real ClickHouse instances.

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