The material master record for one grade.

SAP-style split: the grade row is the client-level basic data (canonical catalogue, or your org-private grade), the override is your organization's layer (SKU, trade name, property overrides), and pricing is the plant-level costing view — the €/kg each of your costing environments would actually use today, each entry labelled env_rate (that environment's own material rate wins) or platform_default (the seed fallback applies). Reuses the calc path's own resolver, so display and pricing cannot disagree.

group is what the grade's workpiece-material group states — thermal figures, sheet-forming parameters, and the route gates that decide which processes the material may take at all. A grade inherits every key it does not state itself, so most materials' laser, weld and treatment verdicts are here rather than on the grade. Each key names the node of the tree that states it, and is marked where the grade's own figure or your override overrides it.