schema-diff
Compare two schema states and surface the risky changes. Use before applying migrations or after a model change.
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- 2026年6月29日 21:52
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- schema-diff
- description
- Compare two schema states and surface the risky changes. Use before applying migrations or after a model change.
- when_to_use
- reviewing a migration, "what changed in the schema", pre-deploy check
# Schema Diff
Diff old vs new schema. Flag by risk:
- **Destructive** (high): dropped column/table, narrowed type, new NOT NULL on existing rows, dropped index a query relies on.
- **Locking** (high at scale): index without CONCURRENTLY, type change that rewrites the table.
- **Safe**: new nullable column, new table, new index CONCURRENTLY.
For each destructive change: is data lost? is it reversible? is there a backfill? Output a risk-ranked list and a go/no-go with the safe rollout order.
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