{
  "operation": "Upsert Trend Preference Vector from Explicit Interests and Behavior Events",
  "method": "POST",
  "path": "/api/alerts/preferences",
  "request": {
    "actorId": "string",
    "followerCount": 0,
    "aggressiveness": 1.0,
    "explicitNiches": [
      "string"
    ],
    "explicitTopics": [
      "string"
    ],
    "explicitRegions": [
      "string"
    ],
    "explicitSources": [
      "string"
    ],
    "event": {
      "action": "alert_opened",
      "niche": "string",
      "topic": "string",
      "region": "string",
      "source": "string"
    }
  },
  "response": {
    "message": "Updated preference vector payload"
  }
}