Issue:

There is currently no way to save each run so if a user doesn't copy the string before they close the box and leave the instance it is gone forever.

Solution:

Create a persistent database like many other add-ons have that:

1. Creates a database on add-on load if it does not exist.
2. Add each run into the database at the end of the instance.
3. Database persists through sessions (logging in/out & stopping/starting).

Follow-up would be to add functions for the user to manipulate this data via slash commands or via a gui.