ClickHouse 26.2 Broke insert_deduplicate = 0 - Why Your Re-Inserts Silently Vanish and How to Fix It
After upgrading to ClickHouse 26.2+, re-inserting identical data into Replicated tables can be silently dropped even though the insert reports success. Here's exactly why it happens and the right way to fix it.
September 21, 202611 min read