{
    "classifications": [
        {
            "column": "Sr No",
            "label": "primary_key",
            "confidence": 0.98,
            "reason": "3044 distinct over 3044 rows, no nulls, sequential id 1..3044"
        },
        {
            "column": "Date dd/mm/yyyy",
            "label": "none",
            "confidence": 0.95,
            "reason": "Date attribute with repeated values, not a key"
        },
        {
            "column": "Startup Name",
            "label": "none",
            "confidence": 0.8,
            "reason": "Descriptive name, about 81% distinct, repeats across funding rounds; not a join key"
        },
        {
            "column": "Industry Vertical",
            "label": "none",
            "confidence": 0.95,
            "reason": "Descriptive category attribute"
        },
        {
            "column": "SubVertical",
            "label": "none",
            "confidence": 0.95,
            "reason": "Free-text descriptive attribute, about 64% distinct"
        },
        {
            "column": "City  Location",
            "label": "none",
            "confidence": 0.9,
            "reason": "Categorical location attribute with no referenced table"
        },
        {
            "column": "Investors Name",
            "label": "none",
            "confidence": 0.9,
            "reason": "Free-text investor list, not an ID"
        },
        {
            "column": "InvestmentnType",
            "label": "none",
            "confidence": 0.95,
            "reason": "Categorical attribute"
        },
        {
            "column": "Amount in USD",
            "label": "none",
            "confidence": 0.97,
            "reason": "Measure stored as text"
        },
        {
            "column": "Remarks",
            "label": "none",
            "confidence": 0.97,
            "reason": "Free-text notes"
        }
    ]
}