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A mobile app sends about a billion events a day. Design a system for collecting and storing these events so that analysts can build reports and product dashboards update within a few minutes.Mid-levelDesign a service where users upload CSV files of up to several gigabytes, and the service validates them and loads them into PostgreSQL. How would you build it in Python?Mid-levelThe business wants a real-time dashboard of revenue and order count, with no more than a minute of delay, and the numbers have to match the daily report. How would you design this system?Senior