33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
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"""Transaction deduplication rules.
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Determines whether two transaction records likely represent the same
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underlying financial event captured from different screenshots / pages.
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"""
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from datetime import timedelta
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from app.models.transaction import TransactionRecord
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TIME_WINDOW = timedelta(minutes=5)
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def is_duplicate_pair(a: TransactionRecord, b: TransactionRecord) -> bool:
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# Rule 1: exact order_no match
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if a.order_no and b.order_no and a.order_no == b.order_no:
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return True
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# Rule 2: same amount + close time + same account tail
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if (
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float(a.amount) == float(b.amount)
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and a.trade_time
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and b.trade_time
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and abs(a.trade_time - b.trade_time) <= TIME_WINDOW
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):
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if a.self_account_tail_no and b.self_account_tail_no:
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if a.self_account_tail_no == b.self_account_tail_no:
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return True
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# same counterparty and close time is also strong signal
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if a.counterparty_name and a.counterparty_name == b.counterparty_name:
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return True
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return False
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