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When Redis cache is populated from DB with a NULL window_1d_start, the Lua increment script only updates usage counters without setting window timestamps. IsWindowExpired(nil) previously returned false, so the accumulated usage was never reset across time windows, effectively turning usage_1d into a lifetime counter. Once this exceeded rate_limit_1d the key was incorrectly blocked with "日限额已用完". Fixes Wei-Shaw/sub2api#1022