User

The User object is a key-only object that indexes the accounts a user is following or is a member of. There can be only one User object per address.

public struct User has key {
    id: UID,
    // account type to list of accounts that the user has joined
    accounts: VecMap<String, vector<address>>,
}

Each Account implementation can define functions to add and remove an account address within this object. The key corresponds to the TypeName of the Config type, and the value is the list of saved account addresses.

An Invite can be created and sent to the owner of a User object, enabling them to add the provided address to their list of accounts.

This feature eliminates the need for off-chain indexing.