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perf(artifact-delivery): cut D1 round trips per run - #496
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The build queue consumer runs in a US colo, and the D1 primary is in Sydney. Each round trip cost about 170 ms in production traces, and a build spent 19 to 22 of them. Every state change wrote, then read the row back. A state change now returns its row with RETURNING, a new Resolution request stores its row in one statement, and a grant that names its Resolution reads the row and its check results in one batch.
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GitHub merged this pull request. No material findings were recorded. 0ee3121a-c99e-4016-acd0-cebe83e086bd |
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🔗 Linked issue
None. Launch prep for
skilld runlatency.❓ Type of change
📚 Description
The Artifact build queue consumer runs in a US colo, and the D1 primary is in Sydney. In production traces from 2026-10-07, each D1 round trip from the consumer took 158 to 244 ms, and one build made 19 to 22 of them. Every state change wrote the row, then read it back.
RETURNING *, so it costs one round trip.INSERT ... RETURNING *. A replayed Idempotency-Key finds nothing inserted and reads the existing row.RETURNING, as D1 does.D1 round trips per path, counted by the new tests: