Workbooks
Server-backed workbooks group imported sheets, derived views, pivots, joins, reports, and dashboard previews.
Storage mode: degraded. No DATABASE_URL is configured. Server APIs expose public read-only empty state; browser imports are saved as explicit local previews.
No server-backed workbooks yet
Browser-local workbook drafts still work through Add Sheet. Protected server persistence becomes active when DATABASE_URL and PLATPHORM_API_KEY are configured.