validating-schema-evolution

Validates schema changes between dataset / table / API revisions — diffs old vs new schema, classifies each change as breaking (column drop, type change, non-null added without default, primary-key change), non-breaking (column add with default, type widening), or ambiguous (rename), and produces a migration script scaffold per breaking change. Use whenever a dataset's schema is about to change, whenever a downstream consumer reports unexpected nulls or type errors after an upstream refresh, or whenever an API version bump is being reviewed for backwards compatibility.

模型生成摘要（rules/v1 · 2026-11-14 04:53）：Validates schema changes between dataset / table / API revisions — diffs old vs new schema, classifies each change as br…
这是模型对公开材料的总结，不是官方声明，请以原链内容为准。

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版本	存档时间	内容哈希	内容
v1	2026-11-14 04:52	d7066034	可取

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