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SELECT entity_id, trans_date , COALESCE(sum(daily_amount) OVER w, 0) AS trans_total , COALESCE(sum(daily_count) OVER w, 0) AS trans_count FROM ( SELECT entity_id , generate_series (min(trans_date)::timestamp , GREATEST(min(trans_date), max(trans_date) - 29)::timestamp , interval '1 day')::date AS trans_date FROM transactiondb GROUP BY 1 ) x LEFT JOIN ( SELECT entity_id, trans_date , sum(amount) AS daily_amount, count(*) AS daily_count FROM transactiondb GROUP BY 1, 2 ) t USING (entity_id, trans_date) WINDOW w AS (PARTITION BY entity_id ORDER BY trans_date ROWS BETWEEN CURRENT ROW AND 29 FOLLOWING);

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