I do have all my different applications go through a suitable layer to access the data. That layer is called postgresql. It stores all the data, and all the r

I do have all my different applications go through a suitable layer to access the data. That layer is called postgresql. It stores all the data, and all the rules about what constitutes valid data. This way, there is never any chance of invalid data getting in from one of the half dozen applications written in various languages forgetting one of the hundreds of rules.