feat(db): pre-migration backup + version gate + restore #14
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Context: Add a safety net around IndexedDB schema upgrades. Changes: Introduce prepareConnection/version gate checks; create tiered pre-migration backups; add restore/emergency restore flows; add regression tests. Impact: Prevents silent data loss during upgrades and blocks opening a newer DB with an older app. Tests: npx tsc --noEmit; npm test -- --run Docs: Updated docs/WORKLOG.md
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Summary\nAdd a migration safety net for IndexedDB upgrades: version gate + automatic pre-migration backups + restore path.\n\n## Root Cause\nSchema upgrades previously ran without a safety backup and without a guardrail for "DB newer than app" scenarios.\n\n## Changes\n- [ ] services/db/core/versionGate.ts: peek DB version (no upgrade) and return actionable status\n- [ ] services/db/core/migrationBackup.ts: export-and-store backup before upgrades (tiered storage)\n- [ ] services/db/core/migrationRestore.ts: restore from backup / emergency restore helper\n- [ ] services/db/core/connection.ts: add prepareConnection() + integrate safety flow; avoid open() stampede\n- [ ] services/db/core/errors.ts: treat DbError kind 'Version' as requiresUserAction\n- [ ] tests/db/migrations/*: add coverage for version gate, backup, restore\n\n## Testing\n- [x] npx tsc --noEmit\n- [x] npm test -- --run\n\n## Review Checklist\n- [x] No direct commits to main\n- [x] One issue per PR\n- [x] Tests pass locally\n\n## Follow-ups\n- services/db/core/connection.ts is ~346 LOC (above the 300 LOC guideline); consider a small decomposition PR later.