ENTITY
main_auth_descriptor
The auth descriptor that manages an account.
It can only be substituted, not deleted. Every user account must have a main auth descriptor.
entity main_auth_descriptor {
key account: account;
key auth_descriptor: account_auth_descriptor;
}key account: account;the account of which this auth descriptor is the manager of
key auth_descriptor: account_auth_descriptor;the auth descriptor that manages the account