KB / Memory / tech-cloudflare-workflows-reset-on-code-update
Updating a Worker resets in-flight Cloudflare Workflows
Deploying a Worker that hosts a running Workflow resets the Durable Object and fails the instance
A Cloudflare Workflow instance is a Durable Object. Deploying new code for the host Worker resets that DO. The instance fails with Durable Object reset because its code was updated.
List or wait for instances (wrangler workflows instances list) before deploying the host. Do not treat a new instance as a clean retry of side effects already written by the old run.
Related: tech-workflows-binding-schedules, tech-cloudflare-cron-triggers-five-per-account.