templates/model-contract.md

# Data model and transformation contract

**Model and owner:**
**Semantic purpose and primary consumers:**
**One-row-per grain:**
**Business/technical keys and uniqueness scope:**
**Source tables, grains and relationships:**
**Time zone, event/system time and SCD policy:**
**Update/delete and late-arrival semantics:**
**Measure definitions and exclusions:**
**Schema evolution and breaking-change policy:**
**Read-only validation SQL / test fixtures:**
**Rollback / repair / migration dependencies:**