Hey Guys! I just open-sourced Zenith , a columnar database engine purpose-built for AI agent traces. why I built it Got mad with Clickhouse and couldn't find a OSS alternative for traces. tbh Agent traces are weird. they're long, sparse, high-cardinality JSON with bursty ingest, late annotations, and fat text fields. existing backends are built for short structured spans and pay a 10-100x cost on this workload. Built for things ppl acc do with Agent Traces: load a full trace tree (B1): pull every span for a trace_id , e.g., "show me everything that happened in this user's session". 571μs p95 at 1B rows filter by attribute (B2): "find spans where model=claude-opus and tokens > 4000 ".…