What this will do:
This action will DROP and recreate the local MySQL database tables (line_items, creatives, line_item_creatives, users, and TRUNCATE cron_logs).
Note: Downloaded images are
NEVER deleted and remain safely on disk.
Under the hood:
It will execute db-clear-data.php via AJAX. It
does NOT connect to Google Ad Manager API, it only resets your local state.
Next steps:
After clearing, the dashboard will be empty until the background CRON job runs again.