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    "title": "Dataset Change Detector: new, removed, changed items",
    "description": "Compare the previous and current dataset of a scheduled scraper and output only what changed: new items, removed items and changed fields with before/after values and % change. Price, stock, jobs and listings monitoring. $0.50 per 1,000 changes.",
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            "type": "string",
            "description": "Dataset ID of the earlier scraper run (its 'defaultDatasetId', e.g. 'WkzbQMuFYuamGv3YF'): the baseline. Required for real results; leave both datasets empty for a free demo on sample data."
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          "keyFields": {
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              "type": "string"
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          },
          "watchFields": {
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              "type": "string"
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          },
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