types-codecs-compression

name	types-codecs-compression
description	ClickHouse type sizing, Nullable, LowCardinality, codec, compression, and column storage guidance.

Use this skill when diagnosing wasteful schemas, poor compression, oversized integer types, Nullable overhead, LowCardinality opportunities, or codec choices.

Read reference.md before proposing schema changes or ALTER TABLE statements related to data types and codecs.