Rating event payloads

Rating events describe a rating record for one user, entity, and normalized aspect. They use the common ExtensionEvent envelope and add a nested value under Data["entity"].

Nested data shape

C# lookup	JSON notation	Runtime type	Contract
`Data["entity"]`	`data.entity`	`Dictionary<string, object?>`	Rating-specific payload object.
`Data["entity"]["userId"]`	`data.entity.userId`	`int`	Cove user identifier that owns the rating.
`Data["entity"]["aspect"]`	`data.entity.aspect`	`string`	Normalized rating aspect; the default is `overall`.
`Data["entity"]["value"]`	`data.entity.value`	`int?`	Written rating value, or `null` when deleted.

EntityType identifies the rated entity kind and EntityId identifies that entity. Currently supported rating mutations can publish video, image, gallery, performer, studio, group, or tag as EntityType.

Event catalog

`CanonicalEventType`	`EventType`	Published when	`value`
`rating.created`	`rating.created`	A user writes an aspect that has no existing rating record.	`int`
`rating.updated`	`rating.updated`	A user writes an aspect that already has a rating record.	`int`
`rating.deleted`	`rating.deleted`	A user clears an aspect that has a rating record.	`null`

Clearing an aspect without an existing rating is a no-op and does not publish an event.

`rating.created` payload

{
  "eventType": "rating.created",
  "canonicalEventType": "rating.created",
  "entityType": "video",
  "entityId": 42,
  "data": {
    "entity": {
      "userId": 7,
      "aspect": "overall",
      "value": 4
    }
  }
}

`rating.updated` payload

{
  "eventType": "rating.updated",
  "canonicalEventType": "rating.updated",
  "entityType": "video",
  "entityId": 42,
  "data": {
    "entity": {
      "userId": 7,
      "aspect": "overall",
      "value": 5
    }
  }
}

`rating.deleted` payload

{
  "eventType": "rating.deleted",
  "canonicalEventType": "rating.deleted",
  "entityType": "video",
  "entityId": 42,
  "data": {
    "entity": {
      "userId": 7,
      "aspect": "overall",
      "value": null
    }
  }
}

Reading the nested values

The nested runtime value is an object, so a direct IEventExtension implementation should validate its type and fields:

if (evt.Data?.GetValueOrDefault("entity") is Dictionary<string, object?> rating)
{
    var userId = rating.GetValueOrDefault("userId");
    var aspect = rating.GetValueOrDefault("aspect");
    var value = rating.GetValueOrDefault("value");
}

Handlers should use the user and aspect together when maintaining derived rating state. EntityId alone is not a unique rating identity.