pub fn compute_stats(store: &SessionStore) -> Result<RecStats>Expand description
Compute aggregate statistics across all sessions.
Uses load_header_and_footer() for efficient scanning — skips
full command deserialization. Collects:
- Session count
- Total commands and duration (from footer)
- Storage size (from file metadata)
- Tag frequency counts (top 10)
§Errors
Returns an error if the session list cannot be read.