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You can remote it from state for sure Pulumi state rm <urn>

I'm trying to do it in a more "Automated" way, so that wouldn't really work. example: https://github.com/pulumi/examples/blob/master/azure-cs-functions/FunctionsStack.cs#L52 This blob is used as the source for the WebApp code. When a new build happens, the blob url doesn't change, therefore you don't get an update to the function. What I need is a way to update that blob url on line 95 so that it points to a new blob, without deleting the old blob. The "without deleting" is important as there's no guarantee that existing functions have picked up the new URL, so both need exist until the updates has fully propogated, which I don't believe we can know.

This sounds like it might do that... however I've never used it myself so I'm not sure exactly how it works. This may be an accidental red herring, I'm just passing it along in case you wish to try it out: https://www.pulumi.com/docs/intro/concepts/resources/#protect

Protect wouldn't really do that, as it stops you from accidentally deleting a resource by stopping the deployment if it detects a delete.

Since pulumi is just code, what about making a copy of the blob if exists.

All good points, but unless Pulumi thinks it's a new resource, it won't change the contents of the blob. So no amount of versioning etc. will fix that. Building it as a custom http request may work, but that feels very hacky.