{
    "classifications": [
        {
            "column": "User_ID",
            "role": "identifier",
            "confidence": 0.95,
            "reason": "Row key with U#### pattern (duplicates are data-quality issues)"
        },
        {
            "column": "Age",
            "role": "measure",
            "confidence": 0.55,
            "reason": "Numeric age (messy strings) that is averaged; could be binned as a dimension"
        },
        {
            "column": "Gender",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Low-cardinality categorical label"
        },
        {
            "column": "Country",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Geographic category"
        },
        {
            "column": "User_Type",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Two-value category"
        },
        {
            "column": "Education_Level",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Categorical level"
        },
        {
            "column": "Profession",
            "role": "dimension",
            "confidence": 0.7,
            "reason": "Categorical job title, groupable though high cardinality"
        },
        {
            "column": "Monthly_Income",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Currency amount to be summed/averaged"
        },
        {
            "column": "AI_Tool",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Tool name category"
        },
        {
            "column": "AI_Purpose",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Low-cardinality purpose category"
        },
        {
            "column": "AI_Usage_Hours_Per_Day",
            "role": "measure",
            "confidence": 0.92,
            "reason": "Numeric hours quantity"
        },
        {
            "column": "Tasks_Performed",
            "role": "attribute",
            "confidence": 0.95,
            "reason": "Free-form long text description"
        },
        {
            "column": "Monthly_AI_Cost",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Currency amount"
        },
        {
            "column": "Productivity_Score",
            "role": "measure",
            "confidence": 0.93,
            "reason": "Numeric score averaged"
        },
        {
            "column": "Accuracy_Rating",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Small rating scale, averaged"
        },
        {
            "column": "Satisfaction_Score",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Rating score, averaged"
        },
        {
            "column": "Time_Saved_Hours_Per_Week",
            "role": "measure",
            "confidence": 0.93,
            "reason": "Numeric hours quantity"
        },
        {
            "column": "Work_or_Study_Hours_Per_Day",
            "role": "measure",
            "confidence": 0.92,
            "reason": "Numeric hours quantity"
        },
        {
            "column": "Would_Recommend",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Yes/No/Maybe category"
        }
    ]
}