Deduplicate Records by Composite Key

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Problem

Given a list of record dictionaries records, a list of field names key_fields that form a composite key, and a field name timestamp_field, return a new list with duplicate records removed. Records are duplicates if all values in key_fields match. For each composite key, keep only the record with the largest value in timestamp_field.

Constraints

1 <= len(records) <= 10^5
Each record contains all fields listed in key_fields and timestamp_field
1 <= len(key_fields) <= 5
Timestamp values are comparable with >

Function Signature

def deduplicate_records(records, key_fields, timestamp_field):

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