feat(db): add migration safety storage layer#9
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MOTIVATION: - Pre-migration backups protect user data during schema upgrades - Tiered storage (OPFS → BackupDB → localStorage → Download) ensures backup succeeds across different browser capabilities - Shared types enable clean separation between backup and restore modules APPROACH: - migrationTypes.ts: Shared types, constants, and metadata helpers - backupStorage.ts: Tiered storage abstraction for writing backups - restoreStorage.ts: Tiered retrieval abstraction for reading backups - Each module is under 300 LOC following project conventions CHANGES: - services/db/core/migrationTypes.ts: Types and metadata management (108 LOC) - services/db/core/backupStorage.ts: Store backup with fallback tiers (237 LOC) - services/db/core/restoreStorage.ts: Retrieve backup from any tier (170 LOC) IMPACT: - Foundation for migration backup/restore system - No runtime changes yet - modules are not wired into connection.ts - Part 1 of 4 PRs for migration safety feature TESTING: - TypeScript compilation passes - Unit tests to be added in separate PR 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Changes
migrationTypes.tsbackupStorage.tsrestoreStorage.tsTest plan
Part of Migration Safety Feature
This is PR 1 of 4:
🤖 Generated with Claude Code