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Design a credit tracking service for user token balances

Design a system that tracks user token credits and can efficiently query the number of tokens a user has at any given timestamp. The service should handle credit additions, deductions, and historical balance lookups.

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OpenAI

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Early August, 2026

OpenAI
Staff

Early August, 2026

OpenAI
Staff

Mid July, 2026

OpenAI
Staff

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Design a credit tracking service for user token balances | Hello Interview