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Jason
36a103bbe4
Audited all proxy format-conversion paths (Chat<->Message, Chat<->Response, Gemini<->Message) for usage/cache metering. Five issues found and fixed. The dedup mechanism (request_id PK, proxy/session source isolation) is untouched, so no double-counting is introduced. - A (Claude + openai_chat, streaming): inject stream_options.include_usage so OpenAI-compatible upstreams emit usage in the SSE tail. Without it the converted Anthropic message_delta was all-zero and the whole request's input/output/cache was dropped. Same root cause as the already-fixed Codex Chat path; the injection is extracted into a shared helper (transform::inject_openai_stream_include_usage) reused by both paths. - C (Claude + gemini_native): subtract cachedContentTokenCount from input_tokens in build_anthropic_usage so input becomes fresh input (Anthropic semantics). Previously the cache-hit tokens were billed twice because this path meters as app_type="claude" (input_includes_cache_read = false) while Gemini's promptTokenCount includes the cache. - D (Codex + openai_chat, streaming): gate log_usage on has_billable_tokens() to skip the synthetic all-zero usage the converter emits when a non-compliant upstream omits usage, preventing empty-row request-count inflation. - P2 (from_claude_stream_events): use has_billable_tokens() for the return gate instead of input>0||output>0, so a fully-cached streamed request (cache_read>0, input==output==0) is still recorded. Affects all Claude-streaming paths, not just Gemini. - P3 (Codex Chat->Responses, non-streaming): apply the same has_billable_tokens() filter the streaming branch got, since the synthesized all-zero usage makes from_codex_response return Some and bypass the `if let Some` guard. Add TokenUsage::has_billable_tokens() as the unified predicate. New tests cover include_usage injection, gemini input subtraction, the gate itself, cache-only stream recording, and synthetic all-zero codex usage. Full lib suite: 1569 passed.