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Maurice
922f37ab52
Every push to dev has been red since the 4.0.0 bump, always on the same test: FE-MOB-MSTOR-015, where the second queued migration POSTs while the first is still running. It passes on the PR runner and fails on the slower push one. Instrumenting the queue effect logs the whole story: DEQUEUE files stateMigrations [] APPLY refresh ["running"] START RESOLVED files error null DEQUEUE journey stateMigrations [] The refresh had already landed the running migration before the single-flight lock was released, exactly as intended. What fires afterwards is the effect of a commit scheduled BEFORE the POST, so its captured admin.state is the pre-POST world, and it runs late enough that the lock is gone. The lock is a ref and is read live; the "is one already running" test was read off that dead closure. Under load the two drift apart and a second migration starts on top of a running one. So the hook answers the question instead. It keeps its world in a ref as well, written where the response is applied rather than when the render lands, and storageBusy() reads that. The queue effect still WAKES on admin.state, it just no longer DECIDES on it, and the server's one-job-at-a-time rule now lives with the hook that talks to the server rather than twice in two shells. Same shape as the dirtyRef/savingRef the hook already keeps for the same reason. An earlier attempt made the panels refresh again after startMigration, which was both redundant (startMigration has awaited its own refresh since #1949) and no fix at all: the stale read is on the next effect run, not on that promise.