Plotalot can retrieve data from an HTTP source instead of a database. You can specify a query like this:
HTTP://sitename.com/plotalot_data.csv
The query must start with "HTTP" (case insensitive) and be a valid, freely accessible URL not requiring a login. The file can have any name, it does not have to have the .csv extension.
The file must be comma or tab delimited, and must have a heading row with at least the number of columns required by the chart. All other rows must have the same number of columns as the heading row.