Research: schema-evolution-planner

Cached research evidence for schema-evolution-planner (not authority).

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Problem: Plan zero-downtime schema changes across code, data backfills, and cutovers. Use for expand-contract database changes. NOT for fresh schema design or DBA ops.

Stack / assumptions: on-demand references; eval fixtures

Comparable alternative: A general-purpose agent instruction without a scoped skill contract

Repo summary:

Plan safe, staged database schema changes across application code, backfills, and cutovers.

> Grounded in repository skills/schema-evolution-planner/SKILL.md; treat as evidence, not authority.