message: Make entity ref unique
diff: @@ -25,7 +25,7 @@ exports.up = async function up(knex) {
  table.text('id').primary().notNullable().comment('Primary id');
  table
  .text('entity_ref')
  - .primary()
  + .unique()
  .notNullable()
  .comment('A reference to the entity that the refresh state is tied to');
  table
  