feat(api): add X-NexusGate-ReqId request deduplication#59

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feat/reqid-deduplication

Jan 24, 2026

Commits on Jan 24, 2026

feat(api): add X-NexusGate-ReqId request deduplication

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fix: address PR review feedback

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fix(api): finalize pre-created completion on failure paths

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fix(api): improve ReqId handling robustness

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fix(api): return 400 error when ReqId exceeds max length

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fix(api): fix SSE error format and preserve tool_calls in cached responses

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refactor(api): reduce ReqId handling code duplication and improve validation

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refactor(api): consolidate ReqId handling with helper functions

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fix(db): use PostgreSQL error code for unique constraint detection

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