Roman Adt worked on the graphprotocol/graph-tooling repository, focusing on improving Substreams deployment reliability by addressing a critical configuration issue. He fixed a bug where the graft type was missing from the substreams manifest, enabling correct graft configurations for subgraph deployment. Roman’s approach involved updating the manifest.graphql file to add the graft type with base and block fields, ensuring proper schema definition and compatibility. Utilizing his expertise in GraphQL schema definition and Substreams, he linked the change to a specific commit for traceability. This targeted fix enhanced the maintainability of the deployment workflow, demonstrating depth in configuration management and schema design.