Graphs and charts are a useful visual way to view historical data - they make it easier to detect trends and get a big-picture view of data. All we need is timestamped data - table rows that are stamped with a specific date/time format, that can be used to group rows into time periods.
Time stamped data
In order to aggregate table data by time periods / ranges, we need a date/time column in the table we want to analyze.
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