Your comments about the way you were treated at the place you worked really jarred me. It did seem so unbalanced.

I know you are finished there now, but can you ask to meet with a boss/supervisor to review what you achieved there? It would be a good time to discuss things you had achieved, and might help both of you to put your work into perspective. You could say, "I would have liked to have the opportunity to do <grants/database> work. Do you feel I was not ready for this? What skills do you think I need to work on in order to take on this type of role?"