{
    "classifications": [
        {
            "column": "Company Name",
            "role": "identifier",
            "confidence": 0.8,
            "reason": "Unique per row (98 distinct of 98); identifies each company/row"
        },
        {
            "column": "Founded",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Year, used for grouping/slicing"
        },
        {
            "column": "Location",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Low-cardinality city category"
        },
        {
            "column": "Sector",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Categorical industry label used for grouping"
        },
        {
            "column": "What it does",
            "role": "attribute",
            "confidence": 0.97,
            "reason": "Free-form description text, unique per row"
        },
        {
            "column": "Founders",
            "role": "attribute",
            "confidence": 0.93,
            "reason": "Names of people, descriptive display text"
        },
        {
            "column": "Investor",
            "role": "attribute",
            "confidence": 0.7,
            "reason": "Free-form list of investor names, high cardinality, multi-valued"
        },
        {
            "column": "Amount",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Funding amount in dollars (stored as text), aggregated with sum/avg"
        },
        {
            "column": "Stage",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Low-cardinality funding stage category"
        }
    ]
}