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In production

Ask for the prompt by id and let the production channel decide the version:
This is the call you want in application code. Changing which version ships is then a promotion, not a deploy.

Pinning a version

Pass a version to address one exactly:
Useful for reproducing a past run, or for an evaluation that has to compare versions against each other rather than follow whatever is live.

Reading history

History is omitted unless you ask for it, so the common read stays small.

Caching

Every resolve is a network call. If you resolve on a hot path, cache the result for as long as you are willing to wait for a promotion to take effect:
A cache is also a failure mode: a promoted version will not reach callers until entries expire. Keep the window short enough that a rollback still counts as fast.

Falling back

Treat a resolve like any other network call. Keeping a copy of the prompt in your code means an outage degrades quality rather than breaking the feature: