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Feature Request: getTimeSeries function

Feature Request: getTimeSeries function: a task in LegoFlow-SWE (Harbor dataset). Please implement a getTimeSeries function in the metrics helper. This function transforms raw XVIZ stream data into a structured format suitable for time‑series visualisation.

The task

Please implement a `getTimeSeries` function in the metrics helper. This function transforms raw XVIZ stream data into a structured format suitable for time‑series visualisation.

Part of Lego-X/LegoFlow-SWE.