{
    "action": "tool_call",
    "reasoning": "Segment rows by ticker exchange suffix to see coverage, price level and volume differences across exchanges.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT CASE WHEN stock_name LIKE '%.%' THEN regexp_extract(stock_name, '\\.([A-Za-z]+)$', 1) ELSE '(none / US-style)' END AS exchange_suffix, COUNT(*) AS n_rows, COUNT(DISTINCT stock_name) AS n_tickers, MIN(date) AS first_date, MAX(date) AS last_date, MEDIAN(close) AS med_close, MEDIAN(volume) AS med_volume FROM raw.semi_conductor_se GROUP BY 1 ORDER BY n_rows DESC",
        "purpose": "Segment records by exchange suffix of ticker",
        "source": "raw"
    }
}