Aggregate script failing when converting arguments

[clokep]

We're seeing the following error with the panopticon aggregate script:

Traceback (most recent call last):
  File "/usr/src/app/./aggregate.py", line 169, in <module>
    main()
  File "/usr/src/app/./aggregate.py", line 153, in main
    cursor.execute(insert_query, insert_data)
  File "/usr/local/lib/python3.9/site-packages/pymysql/cursors.py", line 168, in execute
    query = self.mogrify(query, args)
  File "/usr/local/lib/python3.9/site-packages/pymysql/cursors.py", line 147, in mogrify
    query = query % self._escape_args(args, conn)
TypeError: not all arguments converted during string formatting

I assume this is due to #17.