Trigger re-read(or update) of (System)App database
Just to archive the right answer from Andrew's comment:  


  Then, as long as the database file is there, the app will read it when
  it needs to read it. There is no need to force read/update from
  outside (well, I'm not even sure if it's possible). It should be
  controlled within the app itself. Apologize if I still couldn't grasp
  the idea, maybe other readers might have solution for this.


I was confused about how these databases are handled. It is exactly as Andrew wrote: It depends on the actual implementation when and how the database is re-read.