I'm a Gadget n00b and I have 2 questions:
1. Can new data models be created only using the Gadget UI or can it be done by manually modifying the schema file in the repository?
2. If I have a model that has a "has many" relationship to "ShopifyProduct" then how can I add an index on the productId field?
The reason for the index is fast retrieval at query time where I can do give me all instances of model where productId = x.