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    "description": "Export ranked Substack publications by category with subscriber, pricing, author, and rank-change data.",
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                "technology",
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                "climate-environment",
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                "health-wellness",
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                "travel",
                "parenting",
                "philosophy",
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                "url"
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            "minimum": 1,
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            "description": "Maximum total rows across all selected boards.",
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            "title": "Include rank changes",
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            "description": "Compare with the prior snapshot in this Actor storage.",
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            "title": "Changed since",
            "type": "string",
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