Model score example: Prune mock data periodically #702
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Before this PR, the mock data would be added continuously to the SQLite database every second and never be pruned or vacuumed. Since the gallery.shinyapps.io-deployed copy is intended to be linked from the homepage and kept running all the time, it needs to stabilize its memory and disk usage. This change ensures that an hour of historical data is available from app startup, and deletes data that's >1 hour old every minute.