Workbooks
Server-backed workbooks group imported sheets, derived views, pivots, joins, reports, and dashboard previews.
Storage mode: server_public. CORE_DB_POSTGRES_URL is configured. OpenSheets will lazily initialize Postgres tables and persist protected server workbook/sheet imports.
No server-backed workbooks yet
Browser-local workbook drafts still work through Add Sheet. Protected server persistence becomes active when a supported Postgres URL env and PLATPHORM_API_KEY are configured.