Where are data saved

I need add piece of PHP code into banner body. Unfortunately, during PHP code improvements, I have created an error, which has made my drupal completely broken. I cannot access admin pages, nor frontend pages.

I would like to delete the piece of code that makes this, but I have no clue, where are data for this module stored. Full search in database did not bring anything, same as some tries for looking in filesystem.

I tried: MySQL Workbench database search for substring I remember from my code.
I tried: Windows Grep in-file search for substring I remember from my code.

Both searches returned other occurencies of my keyword, but nothing form saved data...

So, where is this module storing its data?

Thank you.