Delete your account
You can also do this in the app under Settings, Account and data. Deletion is permanent.
What is deleted
Your login and profile. If you are the only owner of your workshop: its quotes, customers, machine and material libraries, settings, uploaded files and approval records. If others share your workshop, the workshop stays and you are removed from it.
What may be kept
Deletion happens at once. Backups roll off on the schedule in the privacy policy. Purchase records remain with Apple or Google.