Stats sync depends on service_tier_change entries to derive priority premium requests since 69043d307 stopped folding priority-tier into per-message premiumRequests. parseSessionFile(path, fromOffset) initialized currentServiceTier to undefined per call, so an incremental resume past the tier change attributed subsequent priority OpenAI replies with premiumRequests: 0. When fromOffset > 0, parseSessionFile now replays bytes[0..start] purely to seed currentServiceTier from the latest service_tier_change before parsing the unprocessed tail. Bytes are already loaded, so no extra I/O.
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