A daily-stock chart must not have «holes»: even if nothing happened in the event log on a given day, the point should be present and equal to zero — otherwise the chart gets gaps and reads incorrectly. Generate a calendar of days from January 1 to January 15, 2024 inclusive (15 days total — both bounds included), match it against the warehouse events for product_id = 1, and for every day compute the total delta, substituting zero where there were no events. Show the day and the daily delta, sorted by day.