fix(assets): select one deterministic belief per event in KPI endpoint (#2471)

[taran-dev4u]

Closes #2471.

In [GET] /assets/<id>/kpis, sensor.search_beliefs was called with most_recent_beliefs_only=True without setting one_deterministic_belief_per_event=True. For sensors with multiple data sources reporting beliefs about the same event, beliefs across all sources were retained and summed together, causing event values to be double counted.

This adds one_deterministic_belief_per_event=True to the KPI search query so only a single deterministic belief per event is included in the aggregation, and adds a regression test in test_assets_api.py.

[read-the-docs-community]

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± changelog.html
± api/v3_0.html

[Flix6x]

Thanks for taking this on, and for spotting the same root cause we did — the missing one_deterministic_belief_per_event=True is exactly right.

A fix for #2471 was already in flight in #2472, which has since been merged, so this one is superseded. Closing, but the contribution is appreciated — hope to see you in another issue!