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A brand-new interval workflow on a cold engine has no in-memory last_fired entry and no prior durable claim, so the scheduler resolves last = None. interval_should_fire then reads last = now and suppresses the tick (correct: wait a full interval), but the in-memory anchor is only written AFTER a won claim, and no claim is attempted until the prefilter passes. Every subsequent tick repeats with last = None, so the workflow suppresses forever. Extract interval_prefilter_should_fire (free fn over the last_fired map + a thin &self wrapper): on the cold-start None suppress path it seeds the anchor to now so the next tick counts from a real anchor and fires after one interval. It seeds ONLY when last was None; an existing Some anchor is mid-interval and must elapse on its own, so it is never advanced. A due/firing tick passes through without seeding (the post-claim path owns that write). Unit tests (no Db/Postgres; pure in-memory anchor state): - cold start seeds then fires after one interval - mid-interval suppress does not advance an existing anchor - a due fire passes through without seeding Caught by Max in cold review of the scheduled-workflow lane; predates this branch's claim work but lives on the exact lane being cleared. Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>