internal-mdm

name	internal/mdm
description	Performs universal record translation for mdm subsystem. Use when doing cross-domain identity mapping, or when the user mentions the golden record, master data, or vendor translation.
compatibility	["spanner:latest","go:1.21"]
metadata	{"gerp-domain":"mdm","gerp-status":"DRAFT","gerp-reviewer":"TODO","gerp-id":"skill-mdm-01"}

Master Data Management (internal/mdm)

This module is the Universal Translator of the matrix. It maps isolated domain entities (e.g., a "Customer" in Revenue and a "Vendor" in Supply Chain) back to a single Golden Record representing a real-world company.

Constraints

• Zero Foreign Keys: LocalID acts as a pure pointer to another domain's physical row.
• Physical Hierarchy: EntityMapping is interleaved under GlobalEntity in Cloud Spanner to ensure instant mapping resolution without SQL joins.