- Note model (owner_id, title, body, color-key, pinned, archived, deleted_at soft-delete, timestamps) + board index; NOTE_COLORS palette keys. - Migration 0002 (notes table + ix_notes_owner_board). - /api/notes blueprint (login_required): list (?filter=active|archived|trash, pinned-then-updated, read via visible_to_user ACL), create, get, patch (title/body/color/pinned/archived), trash, restore, permanent delete (trash-only). Mutations owner-scoped; empty note rejected (400). - DB-free unit tests: is_empty_note, normalize_color, palette, serialize, auth-guard on list/create. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm