A data analyst is building a Genie space for a hospital operations team that needs to analyze emergency department wait times, patient discharge rates, and nurse-to-patient ratios. The engineer has added the relevant tables, written general instructions describing the hospital operations domain, and configured sample questions. Stakeholders require that any metric involving nurse-to-patient ratios must use the official staffing calculation defined by the compliance team, but Genie should still answer free-form questions about discharge rates and wait times using ad hoc SQL when no trusted asset covers the question. Which approach should the engineer take to satisfy both requirements?