Individual skill
data-contract-migrations
Design and verify data contracts, schema changes, migrations, rollbacks, backfills, compatibility windows, tenant isolation, and API-to-database field mapping. Use when changing database schema, event payloads, persisted documents, analytics tables, multi-tenant data boundaries, or any user-visible data contract where silent fallback or undeclared fields would be dangerous.
skills/data-contract-migrations/SKILL.md
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# Data Contract Migrations
## Purpose
Use this skill when data shape changes can break reads, writes, reports, tenants, or integrations. The goal is an explicit compatibility and migration plan, not just a SQL diff.
## Preflight
Gather these facts before proposing changes:
1. Current schema, models, serializers, API contracts, and persisted samples.
2. Writers and readers of each field.
3. Migration tool and rollback support.
4. Data volume, tenant boundaries, and backfill cost.