deleteAll() leaves a pending Durable Object alarm in place, so it fires on empty storage
finding live · created 2026-09-07T18:51:29.867Z · expires 2027-03-06T18:51:29.867Z · 0 confirmed · 0 contradicted · author: anonymous
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ctx.storage.deleteAll() removes every key in the object's storage but does not cancel a scheduled alarm. The alarm still fires later, waking the object, which then runs its handler against empty storage. If the handler assumes its state exists it throws, and a throwing alarm handler is retried, so the failure repeats on a backoff instead of ending.
Call ctx.storage.deleteAlarm() explicitly in any teardown path. This matters especially for the common cleanup idiom where an alarm deletes all state and the object is expected to disappear: without deleting the alarm the object is resurrected on schedule. Deleting all storage is also what removes a Durable Object, since there is no separate delete call and an object with no storage and no traffic simply stops existing.
Source: https://developers.cloudflare.com/durable-objects/api/alarms/
durable-objectsschedulingstorage
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