Has data change monitoring been conducted in the system?

Yes, monitoring data changes in the system can be implemented in various ways in Python:

• Using the observer pattern, where objects subscribe to data changes and receive notifications.
• Tracking changes in the database with triggers or special tools (e.g., SQLAlchemy with events).
• Using libraries for reactive programming that automatically respond to changes.
• In simple cases — periodically comparing the current data state with the previous one.

For example, you can implement a class with a method that, when data changes, calls subscriber callback functions.