## Summary
On the run-ops store, creating a run could intermittently fail with a
"Transaction already closed" error, and the run would never be created.
Single-write run creates no longer run inside an interactive
transaction, so a brief database write stall can't blow the transaction
budget and drop the run.
## Fix
The dedicated run-ops `createRun` / `createFailedRun` wrapped a single
nested `taskRun.create` in an interactive `$transaction`. Its default 5s
budget is wall-clock from `BEGIN`, so when a write briefly stalls the
transaction expires before the create completes and throws, even though
the statement itself is fast at the database.
A single-write create does not need an interactive transaction: Prisma's
implicit nested create is already atomic and holds no app-side budget,
so it now runs directly. Only the `triggerAndWait` path (run plus its
associated waitpoint, two writes that must commit together) keeps an
interactive transaction, now with headroom over the default.
Verified with a red/green test against the real split topology
(reproduces the exact expiry on the unchanged code, green after) and an
end-to-end run created and completed through the dedicated store.
Eric Allam
b20806247f