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Tobias GesellchenandClaude Opus 4.7
6078309724
The lookup branch of AccountDeviceDir does up to two Stat() syscalls,
so its wall-clock cost is dominated by filesystem latency. On shared
CI runners that latency varies enough that the existing 70 ms absolute
threshold has been tripped repeatedly -- the previous bump from 50 ms
to 70 ms in d97cd45 was the same story. Incrementally relaxing an
absolute bound to track CI noise is a treadmill.
Replace the lookup-time wall-clock check with a ratio against the
in-memory update cost (currently ~8x on dev machines, ~12x on CI).
The 30x threshold leaves comfortable headroom for noise while still
catching an algorithmic regression in the lookup path, where the ratio
would explode well past 30 (an O(n^2) walk over 1000 entries would
push it into the hundreds).
The update path's absolute cap stays in place as a backstop against
catastrophic regressions in that hot in-memory path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>