{
    "action": "tool_call",
    "reasoning": "UNPIVOT may be rejected by the executor, so I build the long form with UNION ALL and self-join it to compute pairwise Pearson correlations across all numeric columns in one query.",
    "tool": "query_sql",
    "args": {
        "sql": "WITH l AS (SELECT user_id, 'age' AS col, CAST(age AS DOUBLE) AS v FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'bedtime_phone_minutes', CAST(bedtime_phone_minutes AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'screen_brightness_pct', CAST(screen_brightness_pct AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'blue_light_filter_active', CAST(blue_light_filter_active AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'caffeine_post_5pm_mg', CAST(caffeine_post_5pm_mg AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'physical_activity_min', CAST(physical_activity_min AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'sleep_latency_min', sleep_latency_min FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'total_sleep_hours', total_sleep_hours FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'deep_sleep_pct', deep_sleep_pct FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'rem_sleep_pct', rem_sleep_pct FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'morning_alarm_snoozes', CAST(morning_alarm_snoozes AS DOUBLE) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT user_id, 'next_day_fatigue_score', next_day_fatigue_score FROM raw.bedtime_screentime_sleep_debt) SELECT a.col AS col_a, b.col AS col_b, ROUND(corr(a.v, b.v), 3) AS r, ROUND(ABS(corr(a.v, b.v)), 3) AS abs_r FROM l a JOIN l b ON a.user_id = b.user_id AND a.col < b.col GROUP BY a.col, b.col ORDER BY abs_r DESC LIMIT 20",
        "purpose": "Top pairwise Pearson correlations among numeric columns",
        "source": "raw"
    }
}