19 lines
672 B
Python
19 lines
672 B
Python
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import random
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def category_weight(category_id: int | None) -> float:
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"""A fake but deterministic-ish stand-in for merchant_categories.risk_weight
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(fraud has no direct DB access -- Redis only, per phase-0-base-project-spec.md §4).
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The business logic does not need to be correct, only to produce a plausible
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spread of scores."""
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if category_id is None:
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return 0.3
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return 0.01 + (category_id % 45) / 44 * 0.94
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def score(category_id: int | None, matched: bool) -> float:
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base = category_weight(category_id) * random.uniform(0.05, 0.3)
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if matched:
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return min(1.0, base + random.uniform(0.55, 0.9))
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return min(1.0, base)
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