Own the target-state data architecture on Google Spanner, ensuring the new data model satisfies functional correctness, performance SLOs, and transactional semantics required by 1000+ applicationsbefore large-scale app rewrites occur.This role is not a schema converter. It is a distributed systems architect role. Define the Logical Canonical Data Model (LCDM) independent of physical storage. Design Spanner-native physical schemas:o Row key distribution (hotspot avoidance)o Interleaving decisions