Session 'annotations' is a list in the places that it's used
Session transformations should work with default values

This reverts part of ee1e11a0452a143c4f1912878aa5ed70c2c9dc31. The bug
was due to the state of the database.
Merge branch 'session_model_types'

* session_model_types:
  Session transformations should work with default values
  Session 'annotations' is a list in the places that it's used