- Batch-fetch tags for notes in a single query instead of per-note loops
- Add composite indexes on notes, note_tags, and sync_log tables
- Wrap sync push in a transaction for atomicity
- Replace O(n) cleanExpiredSessions with single DELETE query
- Use SQL WHERE in getChangesSince instead of loading all notes
- Extract shared syncNoteTags utility to eliminate duplication
- Add root +error.svelte boundary matching app theme
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
