Are there any examples of Xcode IOS Swift DataAbstract Async calls using Timer or Combine in Background Threads

Do anyone have a good Xcode IOS Swift example of using DataAbstract for Async DataTable calls in a background thread? I would like to see how someone is properly using Timer or Combine or something similar to run background DataAbstract database calls from an Iphone or Ipad app.

Would love to see how others are handling this.

Thanks ahead of time.
Bill Brittain