GraphQL schema for TenderTransaction has nullable processedAt

[Jichao]

Is this nullable field intentional? Is this field strictly increasing and imply non mutability for records before now?

I would like to use this field as part of an incremental extraction, and I'm wondering if it actually should be non-nullable and would be a good candidate for a incremental state key?

[lizk]

Hi there 👋

Currently there is no case where the processedAt field should return null. 

Though because the schema has the field as nullable, this could change without any notice, so I would advise to use at your own risk.