{
    "action": "tool_call",
    "reasoning": "No query results are in my evidence, so the numbers in my earlier draft are unverified. I'll run one profiling query over all numeric measures and base the answer on its result.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT 'age' AS measure, COUNT(age) AS n, MIN(age) AS min_v, MAX(age) AS max_v, AVG(age) AS mean_v, MEDIAN(age) AS median_v, STDDEV(age) AS sd_v FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'bedtime_phone_minutes', COUNT(bedtime_phone_minutes), MIN(bedtime_phone_minutes), MAX(bedtime_phone_minutes), AVG(bedtime_phone_minutes), MEDIAN(bedtime_phone_minutes), STDDEV(bedtime_phone_minutes) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'screen_brightness_pct', COUNT(screen_brightness_pct), MIN(screen_brightness_pct), MAX(screen_brightness_pct), AVG(screen_brightness_pct), MEDIAN(screen_brightness_pct), STDDEV(screen_brightness_pct) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'caffeine_post_5pm_mg', COUNT(caffeine_post_5pm_mg), MIN(caffeine_post_5pm_mg), MAX(caffeine_post_5pm_mg), AVG(caffeine_post_5pm_mg), MEDIAN(caffeine_post_5pm_mg), STDDEV(caffeine_post_5pm_mg) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'physical_activity_min', COUNT(physical_activity_min), MIN(physical_activity_min), MAX(physical_activity_min), AVG(physical_activity_min), MEDIAN(physical_activity_min), STDDEV(physical_activity_min) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'sleep_latency_min', COUNT(sleep_latency_min), MIN(sleep_latency_min), MAX(sleep_latency_min), AVG(sleep_latency_min), MEDIAN(sleep_latency_min), STDDEV(sleep_latency_min) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'total_sleep_hours', COUNT(total_sleep_hours), MIN(total_sleep_hours), MAX(total_sleep_hours), AVG(total_sleep_hours), MEDIAN(total_sleep_hours), STDDEV(total_sleep_hours) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'deep_sleep_pct', COUNT(deep_sleep_pct), MIN(deep_sleep_pct), MAX(deep_sleep_pct), AVG(deep_sleep_pct), MEDIAN(deep_sleep_pct), STDDEV(deep_sleep_pct) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'rem_sleep_pct', COUNT(rem_sleep_pct), MIN(rem_sleep_pct), MAX(rem_sleep_pct), AVG(rem_sleep_pct), MEDIAN(rem_sleep_pct), STDDEV(rem_sleep_pct) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'morning_alarm_snoozes', COUNT(morning_alarm_snoozes), MIN(morning_alarm_snoozes), MAX(morning_alarm_snoozes), AVG(morning_alarm_snoozes), MEDIAN(morning_alarm_snoozes), STDDEV(morning_alarm_snoozes) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'next_day_fatigue_score', COUNT(next_day_fatigue_score), MIN(next_day_fatigue_score), MAX(next_day_fatigue_score), AVG(next_day_fatigue_score), MEDIAN(next_day_fatigue_score), STDDEV(next_day_fatigue_score) FROM raw.bedtime_screentime_sleep_debt",
        "purpose": "Profile all numeric measures: count, min, max, mean, median, standard deviation",
        "source": "raw"
    }
}