Hello! I have a table that ended with "ghost" default sort items and can't be deleted in any way. How could I get help with this? It's breaking my application. 
Steps to reproduce:
- Create a table with data
- Add a default sorting
- Change the schema of the data
- Change the default sorting
What happens:
The table has now default sort references to un-existing columns and these can't be removed in any way.
