{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://goodgo.vn/schemas/events/listing.nlp_enriched.schema.json",
  "title": "listing.nlp_enriched",
  "description": "Emitted by the AI NLP worker with quality/keyword enrichment for a submitted listing. Consumed by the listings projection to update search + quality-score fields.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "listingId",
    "qualityScore",
    "keywords",
    "detectedLanguage",
    "modelVersion",
    "scoredAt"
  ],
  "properties": {
    "listingId": { "type": "string", "minLength": 1 },
    "qualityScore": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "Normalized description-quality score. Higher = better."
    },
    "keywords": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 },
      "maxItems": 50,
      "description": "Extracted keywords / key phrases (Vietnamese or English)."
    },
    "detectedLanguage": {
      "type": "string",
      "pattern": "^[a-z]{2}(-[A-Z]{2})?$",
      "description": "IETF BCP-47 language tag, e.g. vi, en, vi-VN."
    },
    "modelVersion": { "type": "string", "minLength": 1 },
    "scoredAt": { "type": "string", "format": "date-time" }
  }
}