98b6647f2a
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lakehouse/auditor 14 blocking issues: cloud: claim not backed — "Verified end-to-end against persistent Go stack on :4110:"
Closes the 2026-05-02 cross-runtime parity gap: Go's
validator.IterateResponse carried trace_id back to callers; Rust's
didn't. A caller pivoting from response → Langfuse → session log
worked on Go but failed on Rust because the join key wasn't visible
in the response body.
## Changes
crates/gateway/src/v1/iterate.rs:
- IterateResponse + IterateFailure gain `trace_id: Option<String>`
(skip-serializing-if-none preserves backward-compat for any
consumer parsing the response without the field)
- Both return sites populated with the resolved trace_id
lakehouse.toml:
- [gateway].session_log_path set to /tmp/lakehouse-validator/sessions.jsonl
— same path Go validatord writes to. The two daemons now co-write
one unified longitudinal log; rows tag daemon="gateway" vs
daemon="validatord" so producers stay distinguishable in DuckDB
queries. Append-write is atomic at the row sizes both runtimes
produce, so concurrent writes from both daemons are safe.
## Verification
Post-restart of lakehouse.service:
POST /v1/iterate with X-Lakehouse-Trace-Id: rust-fix1-test
→ response.trace_id = "rust-fix1-test" ✓ (was: field absent)
→ sessions.jsonl latest row daemon=gateway, session_id=rust-fix1-test ✓ (was: no row)
Cross-runtime drive — same prompt to Rust :3100 and Go :4110:
Rust: trace_id=unified-rust-001, daemon=gateway, accepted
Go: trace_id=unified-go-001, daemon=validatord, accepted
Same file, distinct daemons, one query covers both:
SELECT daemon, COUNT(*) FROM read_json_auto('sessions.jsonl', format='nd') GROUP BY daemon
→ gateway: 2, validatord: 19
All 4 parity probes still 6/6 + 12/12 + 4/4 + 2/2 against live
:3100 + :4110 stacks. Cargo test 4/4 PASS for v1::iterate module.
## Architecture invariant
The "unified longitudinal log" thesis is now demonstrated. Operators
running both runtimes in production point both daemons at the same
session_log_path and DuckDB queries naturally span both producers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>