A4. Composite Version Identifier (Version Quad) A single immutable reference linking code commit, data version, model version, and configuration version for every deployed instance. Tagged to every inference request at the point of execution. From this identifier, the full provenance chain is one lookup away. Assembled automatically at deployment from the four component version identifiers. Responsible party: CI/CD pipeline generates. Technical SME configures the assembly and tagging mechanism. Regulations addressed: Article 12 (record-keeping); Annex IV(2)(b) (version identification); Article 47/Annex V (recorded in the Declaration); Article 49/Annex VIII (recorded in EU database registration). Key outputs

• Per-deployment composite version identifier
• Per-inference-request traceability tag