{
  "schema": "DAT007_TRANSFER_v1",
  "context": "A subscription service changes a nullable external_id into a constrained identifier while a prior migration folder already exists. Review the generated migration, distinguish schema intent from deployed state, and define the clean-apply evidence independently.",
  "independent": true,
  "source_of_truth": "",
  "prior_snapshot_role": "",
  "generated_sql_review": "",
  "clean_apply_evidence": "",
  "database_observation": "",
  "decision": "",
  "residual_limitation": ""
}