- Implemented automatic pruning of stale packages across all platform sync endpoints (Arch, AUR, Debian, Ubuntu, Fedora, Homebrew, Winget)
- Added `last_seen_at` tracking to mark packages as seen during sync runs and identify inactive packages
- Introduced `PRUNE_GRACE_DAYS` and `PRUNE_HARD_DELETE_DAYS` environment variables for configurable soft-delete and hard-delete thresholds
- Extended database schema and models to include 'aur' as a valid repository type alongside 'official' and 'third-party'
- Added repository filter UI in package browser for Arch platform to distinguish between official and AUR packages
- Enhanced init-db script with migration system to track and apply schema changes automatically
- Removed debug-packages and test-sync API endpoints no longer needed
- Extracted sync status management into shared lib/sync/status module
- Updated Next.js config to remove deprecated experimental appDir flag
- Added port specification to production start script for consistency
- Implemented SyncAuth to control sync access with server-only mode and secret key authorization
- Consolidated environment variables into single .env.example with improved sync configuration
- Protected all sync API endpoints (ubuntu, fedora, arch, homebrew, winget) with authentication checks
- Added pg and @types/pg dependencies for PostgreSQL integration
- Created database testing and backend initialization scripts
- Changed dev server port to 3002 to avoid conflicts