reader/backend/firestore.indexes.json

{
  "indexes": [
    {
      "collectionGroup": "prompts",
      "queryScope": "COLLECTION_GROUP",
      "fields": [
        {
          "fieldPath": "id",
          "order": "ASCENDING"
        },
        {
          "fieldPath": "isPublic",
          "order": "ASCENDING"
        }
      ]
    }
  ],
  "fieldOverrides": []
}