Daily changes

Every snapshot is compared with the previous one. An object enters or exits a list, re-enters after being removed, or its risk solution changes. Palermo Scale values drift daily on their own (they depend on time to impact), so they alone never count as a change.

Before the live archive began, snapshots come from irregular Internet Archive captures, so one bar can cover weeks or months of real changes. Each event records a window (after → seen) for exactly that reason.

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