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from collections import defaultdict
from typing import Any, Dict, List
def group_by_year(records: list[dict], datetime_field: str) -> dict[int, list[Any]]:
"""Memory efficient - processes records one at a time"""
by_year = defaultdict(list)
for record in records:
# Extract year from ISO string without full datetime parsing
year = int(record[datetime_field][:4])
by_year[year].append(record)
return dict(by_year)
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