* fix(sse): stop thrashing the provider prompt cache for caching-aware clients
- shouldPreserveCacheControl: preserve client cache_control markers for every
combo strategy. The deterministic-strategy gate forced marker rewrites whose
per-request breakpoint positions are not stable turn-over-turn, thrashing the
upstream prompt cache (observed in production as ~200k cache_write tokens per
turn on quota-share combos). Preserving is never worse: on a stable target
the client's breakpoints advance deterministically; on a target switch both
approaches miss equally.
- prepareClaudeRequest: translator-path opt-in fallback — when preserve-mode
has nothing to preserve (client sent no cache_control anywhere), apply the
standard heuristic so requests never ship with zero cache breakpoints. The
claude-code-compatible relay path keeps its no-supplement contract.
- anthropic-beta: forward the client-negotiated context-1m-2025-08-07 through
the allowlist merge so a /model <id>[1m] client keeps its long-context
negotiation behind the proxy (never forced when the client did not send it).
* fix(sse): surface cache tokens in non-streaming OpenAI usage + finalize pending on quota-share block
- translateNonStreamingResponse (claude→openai): fold cache_read into
prompt_tokens and expose prompt_tokens_details.cached_tokens /
cache_creation_tokens, mirroring the streaming contract (#1426/#2215).
Non-streaming OpenAI clients behind a cached Claude upstream previously saw
prompt_tokens=<uncached remainder> (e.g. 23 for a ~9k request) with no cache
visibility.
- chatCore quota-share block: finalize the pending-request slot before
returning the policy 429 — the path never reaches upstream and the orphaned
pending lingered as a status-0 call-log row until the reaper swept it.
Validated live on the staging box (repro: blocked key → orphan row; after:
clean).
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Co-authored-by: diegosouzapw <diegosouzapw24@gmail.com>
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