(Dunbar User) Assigned to Collection Record

User Story

Permitted users can assign other users to a particular record. The story is the permitted users realizes (through some interface) realizes that a record needs attention. They assign one or multiple Contributor users to it.

What data says "User is assigned Record"?

How can an interface ask "is User assigned to any Records"?

No files, tests, or entry points are named. Start by clarifying the data relationship between users and records, including multiple Contributor assignments and the query for a user's assigned records. Done means the relationship and both assignment questions have an agreed implementation scope.

Written by the indexing model from the issue text.