Function dynamic_relational_actor_owns_appointment 

pub fn dynamic_relational_actor_owns_appointment(
    app_root: &Path,
    runtime_conf_path: Option<&Path>,
    app_id: Option<&str>,
    user_id: i64,
    appointment_id: i64,
) -> Result<bool, DatabaseError>

Checks appointment ownership in the configured primary backend. Executes configured authority admission while retaining storage failures.