Deletion is permanent: your profile, username, Nova ID, devices, contact list, invitations, and encrypted messages are removed from our servers within 30 days. Messages you sent in conversations remain only in the other participant's encrypted copy, like any messenger.
Email support@thenovacalc.com from your verified recovery email with the subject "Delete my account" and your username. We verify ownership by replying to that recovery address, then delete within 30 days.
Nothing personal. Aggregate, non-identifying operational logs (e.g. error counts) age out within 90 days.