{
    "classifications": [
        {
            "column": "_unnamed_0",
            "role": "identifier",
            "confidence": 0.95,
            "reason": "Unique row index with distinct count equal to row count"
        },
        {
            "column": "company_name",
            "role": "dimension",
            "confidence": 0.85,
            "reason": "Low-cardinality company label (152 values) used for grouping and slicing"
        },
        {
            "column": "stock_name",
            "role": "identifier",
            "confidence": 0.6,
            "reason": "Ticker symbol code, 1:1 with company; usable as a key for joins"
        },
        {
            "column": "date",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Trading date, used as a time axis"
        },
        {
            "column": "open",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Numeric opening price, aggregated with avg"
        },
        {
            "column": "high",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Numeric daily high price, aggregated with max or avg"
        },
        {
            "column": "low",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Numeric daily low price, aggregated with min or avg"
        },
        {
            "column": "close",
            "role": "measure",
            "confidence": 0.92,
            "reason": "Numeric closing price, aggregated with avg"
        },
        {
            "column": "volume",
            "role": "measure",
            "confidence": 0.95,
            "reason": "Trading volume quantity, summed or averaged"
        }
    ]
}