{
    "success": true,
    "method": "GET",
    "message": "Aggregate student statistics",
    "data": {
        "total_students": 27,
        "average_score": 84.59,
        "by_status": {
            "active": 23,
            "inactive": 4
        },
        "by_city": {
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            "Chandigarh": 1,
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        },
        "by_course": {
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            "MERN Stack": 5,
            "Java Full Stack": 5,
            "AIML": 4,
            "DevOps": 4,
            "Manual QA": 4
        }
    }
}