Duplicate value "alice@example.com" found in column "email" on sheet "Demo" at rows [2, 8].
Severity reason: Column "email" looks like a key or identifier column, so duplicate values are high severity.
Detector: duplicate_values
Column: email
Duplicate value: alice@example.com
Rows: [2, 8]
Count: 2
Duplicate ratio: 20.0%
Non-empty values checked: 10