Analysing exported session recordings

An export bundles a recording's raw v2 storage blocks (under data/) plus its ClickHouse metadata (session-replay-events.json, events.json). Use this skill to crack those blocks open and measure what the recording is made of, so size or performance conclusions rest on decoded data — not on raw bytes.

Get the zip first via the exporting-session-recordings skill.

The one thing that will mislead you: the blocks are double-compressed

A data/ block is not readable JSON. It is two layers deep, and skipping either layer makes the bytes look like binary garbage or "corruption" that isn't there: