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Issue: No way to set custom poll wait duration via URL in runtimevar.OpenVariable

Issue: No way to set custom poll wait duration via URL in runtimevar.OpenVariable: a task in LegoFlow-SWE (Harbor dataset). This forces users who prefer the simplicity of URL‑based setup to accept an inflexible default polling interval, which may be too aggressive (causing excessive API calls) or…

The task

This forces users who prefer the simplicity of URL‑based setup to accept an inflexible default polling interval, which may be too aggressive (causing excessive API calls) or too slow (delaying updates) for their use case.

Part of Lego-X/LegoFlow-SWE.