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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 April, 2026
OpenAI
Senior
Mid March, 2026
OpenAI
Senior
please provide answer to this Q
Early March, 2026
OpenAI
Senior
Given initial class structure with 6 test cases provided.
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