not_found

HTTP 404 — Not found

When you see it

No row with that id belongs to this user, or it was permanently deleted.

What to do

Treat it as gone. A trashed row is still readable under /trash; a deleted one is not recoverable.

The response

Every error is RFC 9457 problem+json:

{
  "type": "https://devs.inittasks.com/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "a sentence for a developer; never branch on it",
  "instance": "/todos/8E4F2A1B",
  "request_id": "3f9a1c7e-2b44-4d1e-9c30-5a7e8b2d1f60"
}

Branch on type, never on detail or on the HTTP status alone — several codes share a status.