{
    "action": "tool_call",
    "reasoning": "One UNION ALL query gives value frequencies for all six categorical columns at once.",
    "tool": "query_sql",
    "args": {
        "sql": "WITH t AS (SELECT 'primary_bedtime_app' AS column_name, CAST(primary_bedtime_app AS VARCHAR) AS value FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'occupation_type', CAST(occupation_type AS VARCHAR) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'sleep_debt_category', CAST(sleep_debt_category AS VARCHAR) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'chronotype', CAST(chronotype AS VARCHAR) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'gender', CAST(gender AS VARCHAR) FROM raw.bedtime_screentime_sleep_debt UNION ALL SELECT 'blue_light_filter_active', CAST(blue_light_filter_active AS VARCHAR) FROM raw.bedtime_screentime_sleep_debt) SELECT column_name, value, COUNT(*) AS n, ROUND(100.0*COUNT(*)/8500,1) AS pct FROM t GROUP BY column_name, value ORDER BY column_name, n DESC",
        "purpose": "Frequency of each value in every categorical column",
        "source": "raw"
    }
}