Domain model

Domain logic is mostly pure TypeScript/JavaScript modules so Vitest can cover it without Instant.

Core concepts

• Board — named timetable with optional date range and weekly repeat cadence
• Event — block on a weekday with start minutes from 06:00, duration, color, memo
• Settings — per-user synced theme
• Share — public link row with token + secrets + mode/role
• Member — authenticated collaborator; editor authority is boards.editors
• Board prefs — per-user view filters for a board
• Todo — “checked off” marker for an event on a concrete planner date (not a free-form task)

Deep dives

• Schema — Instant entities, links, rooms
• Permissions — Instant rules
• Models — normalization and derived helpers
• Roles & access — owner / member / share guest paths