Data model

A workspace contains notebooks; notebooks contain notes; notes carry tags, attachments, comments and reminders.

workspace
 ├─ members, invitations, api-keys, webhooks
 └─ notebook (nested up to 5 levels)
     └─ note ── tags, attachments, comments, reminders, shares, versions

Deleting a notebook moves its notes to the trash for 30 days. Deleting a workspace schedules permanent removal after 14 days.