Function stats

crates/ccql/src/cli/commands.rs:250–317

(
    config: &Config,
    group_by: &str,
    _since: Option<String>,
    _until: Option<String>,
    format: OutputFormat,
)

}

pub async fn stats(
    config: &Config,
    group_by: &str,
    _since: Option<String>,
    _until: Option<String>,
    format: OutputFormat,
) -> Result<()> {
    let ds = StatsDataSource::new(config.clone());
    let stats = ds.load().await?;

    let mut writer = OutputWriter::new(std::io::stdout(), format);

    match format {
        OutputFormat::Json => {
            writer.write_json(&stats)?;
        }
        OutputFormat::Raw | OutputFormat::Jsonl => {
            writer.write_json(&stats)?;
        }
        OutputFormat::Table => {
            writer.writeln("=== Claude Code Usage Statistics ===\n")?;

            writer.writeln(&format!("Total Messages: {}", stats.total_messages))?;
            writer.writeln(&format!("Total Sessions: {}", stats.total_sessions))?;
            writer.writeln(&format!("Total Tokens: {}", stats.total_tokens()))?;
            writer.writeln(&format!("First Session: {}", stats.first_session_date))?;
            writer.writeln(&format!("Last Computed: {}", stats.last_computed_date))?;

            if let Some(ref longest) = stats.longest_session {
                writer.writeln(&format!(
                    "\nLongest Session: {} ({} messages)",
                    longest.session_id, longest.message_count
                ))?;
            }

            writer.writeln("\n--- Model Usage ---")?;
            let mut model_table = create_table();
            model_table.set_header(vec!["Model", "Input Tokens", "Output Tokens"]);

            for (model, usage) in &stats.model_usage {
                model_table.add_row(vec![
                    Cell::new(model),
                    Cell::new(usage.input_tokens),
                    Cell::new(usage.output_tokens),
                ]);
            }
            writer.write_table(model_table)?;

            if group_by == "date" {
                writer.writeln("\n--- Daily Activity (last 10 days) ---")?;
                let mut daily_table = create_table();
                daily_table.set_header(vec!["Date", "Messages", "Sessions", "Tool Calls"]);

                for activity in stats.daily_activity.iter().rev().take(10) {
                    daily_table.add_row(vec![
                        Cell::new(&activity.date),
                        Cell::new(activity.message_count),
                        Cell::new(activity.session_count),