OptionalaccountDefaults to caller identity.
Aurora cluster resource ID (cluster-XXXXXXXX), which scopes the
rds-db:connect the proxy's role needs to log in upstream as this user.
OptionalpasswordThe shared RDS Proxy's IAM role, which that grant is attached to.
OptionalregionDefaults to the current provider region.
A login by RDS IAM token, for a person's role assumed over SSO.