Implement some sort of data verification, even something as simple as comparing old data to new data, and setting a flag if there's a change or if there's a big change - the idea being that parishes won't often have big changes to their mass schedules, so something out of the ordinary (an extra Mass, an evening Mass, etc) should be easy to spot.
Implement some sort of data verification, even something as simple as comparing old data to new data, and setting a flag if there's a change or if there's a big change - the idea being that parishes won't often have big changes to their mass schedules, so something out of the ordinary (an extra Mass, an evening Mass, etc) should be easy to spot.