⚡️ Fast Replacing of Millions of Rows Daily in ClickHouse – A Partitioned Merge Tree Solution

Jul 29, 2025 · 2 min read · 🚨 The Challenge:We had to replace millions of rows daily, covering data from the past 60 days, and run aggregations on top. Initially, we explored: ✅ AggregatingMergeTree: Worked well only with incremental data, but not suited for full data replace...