Error while trying to delete the User Table

I get the below error when I try to delete the User Table. The Account Table is already deleted.

That’s because you’ve deleted that account without unlinking from the User object so User still refers to the Account which is now deleted.
The account is required but deleted. You can make it required again after deleting. You can do this in the schema. Just remove the ! mark from the account field.
Hypi does not cascade deletes presently nor does it enforce referential integrity. This is something we are planning to make available as an option when you call the delete function.