OptionalERDCombined mermaid erDiagram covering all tables and their cross-table FK relationships. Injected server-side by DatabaseDesignerAgent after Schema Designer returns — never written by the LLM. Omitted when no FK relationships exist across any of the tables.
One entry per table being designed. Single-table = array of length 1. Written by Schema Designer sub-agent; consumed by Validator and Builder.
Schema design artefacts. Always uses the Tables[] array — single-table invocations write Tables[0] only. The Angular wizard action path uses EntityTableSpec directly and never reads this interface.