SQL Rule 1. Always assume there are external processes that might affect your data. (for instance, triggers).
SQL Rule 2. In Denormalised data, never execute logic on dependant table values, always copy from the parent.
SQL Rule 3. When Denormalised data schemas are created the DBA knows what they are doing.
SQL Rule 3.1. If DBA knows what they is doing then according to Rule 1 there is no problem with adding in some triggers to maintain data clones as they are created.
SQL Rule 4. If you don't like or agree with triggers, deal with it. They are a first class tool in a first class RDBMS. In a multi-app or service environment there may be many other external processes massaging your data
SQL Rule 5. If all previous rules are not broken and the system has been running efficiently for many years DO NOT complain that there are triggers in the database that are doing and have been doing the same process that you just butchered (by violating Rule 1 and 2) in your makeshift "hello world, look what I can do from my phone" angular BS when the rest of the users are still relying on the existing runtime app.
SQL Rule 6. If you turn my triggers off, you sure as hell better turn them back on!