Back in 2020, I had written a COVID dashboard using Rails 6.0.2 and Ruby 2.5.1. Given a date range, it displays a line graph of cumulative as well as incremental data for the number of confirmed, deceased, and recovered cases. Its data sources are:

COVID-19 Data Repository by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University: This GitHub repository provides one CSV file per day with country-level cumulative data.

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