{
    "classifications": [
        {
            "column": "Company Name",
            "label": "near_key",
            "confidence": 0.9,
            "reason": "94 of 95 rows distinct (~98.9%), no nulls, but not fully unique, so best key candidate but not a verified primary key"
        },
        {
            "column": "Founded",
            "label": "none",
            "confidence": 0.95,
            "reason": "Year attribute with 25 distinct values; not an identifier"
        },
        {
            "column": "Location",
            "label": "none",
            "confidence": 0.9,
            "reason": "Descriptive location attribute (with misaligned data); not a key"
        },
        {
            "column": "Sector",
            "label": "none",
            "confidence": 0.9,
            "reason": "Categorical attribute, not a key"
        },
        {
            "column": "What it does",
            "label": "none",
            "confidence": 0.8,
            "reason": "Free-text description; 94/95 distinct but not an identifier"
        },
        {
            "column": "Founders",
            "label": "none",
            "confidence": 0.9,
            "reason": "Names text with misaligned values; 85 distinct, not a key"
        },
        {
            "column": "Investor",
            "label": "none",
            "confidence": 0.9,
            "reason": "Descriptive investor text, not a key"
        },
        {
            "column": "Amount",
            "label": "none",
            "confidence": 0.95,
            "reason": "Monetary amount stored as text; measure, not key"
        },
        {
            "column": "Stage",
            "label": "none",
            "confidence": 0.9,
            "reason": "Low-cardinality funding stage category; not a join key"
        }
    ]
}