ClickHouse 24.12 auto-sizes caches from the cgroup limit, leaving insufficient headroom for MV processing and background merges. Adds a custom config that shrinks mark/index/expression caches and caps per-query memory at 2 GiB. Bumps container limit 4Gi → 6Gi. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>