v0.1.0:41 — second hotfix to migration 0009; migration regression tests
The v0.1.0:40 migration was correct on clean installs but crashed at COMMIT on any database with rows in discount_redemptions: SQLite's deferred FK check saw the dropped parent's bookkeeping as unsatisfied even after the rename. Fix is to rebuild discount_redemptions in the same transaction (stash → drop → rebuild → restore) plus orphan cleanup. Migration is idempotent; operators on :40 with a checksum mismatch recover by deleting the version=9 row from _sqlx_migrations and restarting. Lands the missing migration test scaffolding too. The four tests in licensing-service/tests/migrations.rs apply migrations against a realistic populated database (products, policies, invoices, licenses, machines, discount codes, redemptions, webhooks, tip attempts). The regression test fails with the exact 787 error against the v40 migration — would have caught the bug pre-release. KEYSAT_INTEGRATION.md is removed from this repo; it now lives in the parent licensing/ folder.
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