If you edit the DB using an SQLite editor it will save the data to the DB, BUT, it won't show up on the app, that's because the DB is embedded on the app and if you look at the code you will see that the DB will be created IF IT DOESN'T EXISTS, so, you will have to uninstall the app and then reinstall it in order to clear ALL files.
If File.Exists(File.DirDefaultExternal, "SomeDatabase.db") = False Then
File.Copy(File.DirAssets, "SomeDatabase.db", File.DirDefaultExternal, "SomeDatabase.db")
End If
The code above is an example, the "SomeDatabase.db" will be copied from the assets directory to the device if it doesn't exist, but, if you modify the DB manually not from within the app it won't copy it because already exists, therefore, any changes will not show up.