Second half of the migrations split: moved the ~830-line reconcileLegacyMigrations
array into db/migrations/legacyReconcileMigrations.js via the same
buildLegacyReconcileMigrations(deps) factory (same injected db + helpers; no
inline requires in this one). database.js is now 1,297 lines — down from 4,174
at the start of IMP-CODE-02 (~69%).
Added tests/migrationModules.test.js locking the invariants database.js depends
on: both modules build, versioned versions are unique, and every legacy-reconcile
version has a versioned counterpart (the drift the in-app assertion warns about).
Verified: full suite 125 pass; fresh DB applies all 79 migrations (reconcile
path included — a fresh schema.sql DB triggers it) and is idempotent; real prod
DB copy (v1.06) migrates as a no-op with data intact and no version-sync drift.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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