Design listing quality score (1-100) для ранжирования

Ситуация: Avito хочет score quality каждого listing — для ranking, paid promotions, alerts. Какие signals использовать и как combine?

Classifieds. Listings vary widely. Need score: 100 = excellent, 0 = terrible. Used for: organic ranking, paid eligibility, warning sellers.

Доступные данные

• listings: id, photos_count, description_length, price, category
• engagement: listing_id, views, contacts, deals
• feedback: listing_id, deal_outcome, rating

Задачи

• Signal selection: photos, description, completeness, price reasonable.
• Weighting: validate predictive power.
• Score formula + thresholds.
• Update frequency: real-time vs batch.

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