Build a simple CRUD app for one resource

Build a working [FRAMEWORK] app that lets a logged-in user manage their [RESOURCE, e.g. tasks / notes / clients]. Each [RESOURCE] has these fields: [LIST FIELDS AND TYPES, e.g. title (text), status (todo/doing/done), due date (date), notes (text)].

Build the full create, read, update, delete flow:
1. A list page showing all of the current user's [RESOURCE] items, with the most useful fields as columns and a clear empty state.
2. A create form (a page or a modal) that validates input before saving.
3. Edit an existing item using the same form, pre-filled.
4. Delete an item with a confirmation step.

Data rules:
- Store items in [Supabase / Postgres / SQLite]. Each item belongs to the user who created it, and users can only see and change their own items. Enforce that on the server.
- Validate on the server, not just the client.
- Show loading states on save and delete, and a visible error message if something fails.

Structure the data layer so all reads and writes go through one small module I can reuse. Show me the schema and that data module first, then build the pages.